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Student: ___________________________________________________________________________
1. Identify which image in the figure represents the reactants and which image therefore represents the products in the reaction between xenon gas and fluorine gas to form xenon tetrafluoride gas.
A. upper right image = reactants, upper left image = products
B. lower left image = reactants, upper left image = products
C. upper left image = reactants, upper right image = products
D. upper left image = reactants, lower left image = products
E. upper left image = reactants, lower right image = products
2. Identify which image in the figure represents the reactants and which image therefore represents the products in the reaction between ozone gas (O3) and carbon monoxide gas to form oxygen gas and carbon dioxide gas.
A. upper left image = reactants, upper right image = products
B. upper right image = reactants, upper left image = products
C. lower left image = reactants, lower right image = products
D. upper left image = reactants, lower right image = products
E. upper left image = reactants, lower left image = products
3. The figure shows the chemical reaction between nitrogen gas and hydrogen gas to produce ammonia (NH3) gas. Which of the following changes would make the diagram correctly represent conservation of mass?
A. Add one H2 molecule from the image on the left.
B. Add three NH3 molecules to the image on the right.
C. Add three H2 molecules t the image on the right.
D. Remove one H2 molecules from the image on the left.
E. Remove one NH3 molecule from the image on the left.
4. The figure shows a reaction between methane gas (natural gas, CH4) and oxygen to produce carbon dioxide and water. Is the diagram accurate, and if not, what is wrong with it, and how could it be fixed?
A. There are too many hydrogen atoms on the right-hand side of the reaction arrow. Remove one hydrogen atom from each water
molecule.
B. There are too many oxygen atoms on the right-hand side of the reaction arrow. Remove one oxygen atom from the carbon dioxide.
C. The diagram is accurate as shown.
D. There are not enough carbon atoms on the left-hand side of the reaction arrow. Add another methane molecule on the left, and then another carbon dioxide molecule on the right of the arrow.
E. There are not enough oxygen molecules on the left-hand side of the reaction arrow. Add another oxygen molecule on the left of the arrow, and another water molecule on the right.
5. The figure shows a reaction between hydrogen and oxygen gases to produce water. Is the diagram accurate, and if not, what is wrong with it, and how could it be fixed?
A. There are too many water molecules on the right. Remove one water molecule from the image on the right.
B. There are not enough oxygen atoms on the right. Add one more water molecule to the right image.
C. There are too many oxygen atoms in the image on the left. Remove one oxygen molecule.
D. There are not enough hydrogen atoms on the right. Add one more water molecule to the left image, and one more hydrogen molecule to the right image.
E. The diagram is accurate as shown.
6. The figure shows a reaction between xenon gas and fluorine gas. Is the diagram correct, and if not, how could it be modified to show that the law of conservation of mass is obeyed?
A. Add two more XeF4 molecules and two more Xe atoms to the right image.
B. Add four more XeF4 molecules to the right image.
C. Add three more XeF4 molecules and one more Xe atom to the right image.
D. Add one more XeF4 molecule and three more Xe atoms to the right image.
E. The diagram is accurate as shown.
7. Sulfur dioxide gas reacts with oxygen gas to form sulfur trioxide gas. What would the products of the reaction be, if the reactants are those shown in the figure?
A. 2 molecules of sulfur trioxide, and 2 molecules of sulfur dioxide
B. 4 molecules of sulfur trioxide, and 1 molecule of oxygen
C. 3 molecules of sulfur trioxide, and 1 molecule of oxygen
D. 3 molecules of sulfur trioxide, and 1 molecule of sulfur dioxide
E. 4 molecules of sulfur trioxide
8. Gaseous nitrogen monoxide reacts with oxygen gas to form brown nitrogen dioxide gas. What would the products of the reaction be, if the reactants are those shown in the figure?
A. 6 molecules of nitrogen dioxide
B. 5 molecules of nitrogen dioxide, and 1 molecule of oxygen
C. 6 molecules of nitrogen dioxide, and 1 molecule of oxygen
D. 4 molecules of nitrogen dioxide, and 2 molecules of nitrogen monoxide
E. 3 molecules of nitrogen dioxide, and 3 molecules of nitrogen monoxide
9. Which of the following changes represents a physical change, rather than evidence of a chemical reaction?
A. When a piece of zinc metal is placed in a solution of HCl, bubbles begin to form, and the zinc begins to dissolve.
B. When solid ammonium carbonate, (NH4)2CO3, is heated, the solid disappears, and gaseous ammonia (NH3), carbon dioxide (CO2), and water (H2O) are formed.
C. When dry ice (solid CO2) is allowed to stand at room temperature, a white cloud and gaseous CO2 are formed.
D. When a solution of KI is mixed with a solution of Pb(NO3)2, a yellow solid is formed.
E. When a piece of copper wire is placed in a solution of AgNO3, a silvery solid begins to form on the surface of the wire, and the solution turns blue.
10. Which of the following changes represents a physical change, rather than evidence of a chemical reaction?
A. When water and a yellow solution of antifreeze are mixed, the resulting solution is a lighter shade of yellow than the original antifreeze solution.
B. When concentrated HNO3 is placed in contact with copper metal, a brown gas is formed, the copper dissolves, and a green solution is formed.
C. When an egg is fried, the clear part becomes white, and the egg becomes a solid.
D. When a piece of zinc metal is placed in a blue solution of copper sulfate, the solution turns from blue to colorless, the zinc dissolves, and copper metal is formed.
E. When solutions of AgNO3 and NaCl are mixed, a white solid forms.
11. In the figure shown, is a chemical reaction occurring?
A. No, because there are the same number of atoms in both images.
B. Yes, because the atoms have rearranged, and therefore the formulas of the products and reactants are different
C. No, because there are oxygen atoms and nitrogen atoms in both images.
D. No, because both the reactants and products are colorless gases.
E. Yes, because the reactants are gases, but the product is a solid.
12. In the figure shown, is a chemical reaction occurring?
A. Yes, because the Na+ and Cl- ions are being removed from their ionic lattice as they are dissolved.
B. Yes, because the water molecules are reacting with the Na+ and Cl- ions to form a gas.
C. Yes, because a precipitate will be formed when the water and NaCl are mixed.
D. No, because there is no change occurring.
E. No, because the Na+ and Cl- ions are simply being surrounded by the water molecules as the salt dissolves.
13. In the figure shown, is a chemical reaction occurring?
A. No, because there are the same number of atoms in both images.
B. Yes, because the atoms have rearranged, and therefore the formulas of the products and reactants are different.
C. No, because both the reactants and products are colorless gases.
D. No, because there are oxygen atoms and carbon atoms in both images.
E. Yes, because the reactants are gases, but the product is a solid.
14. Consider the following chemical equations. Select the equations that represent chemical reactions, rather than physical changes.
A. I and III only
B. II and III only
C. I, II, and III
D. I only
E. I and II only
15. Consider the following chemical equations. Select the equations that represent chemical reactions, rather than physical changes.
A. I, II, and III
B. I and II only
C. I and III only
D. I only
E. II and III only
16. Consider the following chemical equations. Select the equations that represent chemical reactions, rather than physical changes.
A. II only
B. I, II, and III
C. I and III only
D. I and II only
E. II and III only
17. Write a complete, balanced equation for the reaction that occurs when sodium metal reacts with water to form hydrogen gas and aqueous sodium hydroxide.
A. Na(s) + 2H2O(l) → 2NaOH(aq) + 2H2(g)
B. Na(s) + 2H2O(l) → NaOH(aq) + 2H2(g)
C. Na(s) + H2O(l) → NaOH(aq) + H2(g)
D. Na(s) + H2O(l) → NaOH(aq) + H(g)
E. 2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)
18. Fireworks which give off bright flashes of white light often contain magnesium metal. When the magnesium burns in the presence of oxygen, it forms solid magnesium oxide, and emits a bright white light. Write a complete, balanced equation for this reaction.
A. Mg(s) + O(g) → MgO(s)
B. 4Mg(s) + O2(g) → 2Mg2O(s)
C. 2Mg(s) + O2(g) → 2MgO(s)
D. Mg(s) + O2(g) → MgO2(s)
E. Mg(s) + O2(g) → MgO(s)
19. Zinc metal will react with aqueous hydrochloric acid to produce aqueous zinc chloride and hydrogen gas. Write a complete, balanced equation for this reaction.
A. Zn(s) + 2HCl(aq) → ZnCl(aq) + H2(g)
B. Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)
C. Zn(s) + HCl(aq) → ZnCl(aq) + H(g)
D. 2Zn(s) + 2HCl(aq) → 2ZnCl(aq) + H2(g)
E. Zn(s) + HCl(aq) → ZnCl(aq) + H2(g)
20. When solid ammonium carbonate is heated, it decomposes to form ammonia gas, carbon dioxide gas, and water vapor, so that the solid completely disappears. Write a complete, balanced equation for this reaction.
21. Write a balanced equation to represent the reaction shown in the figure.
22. Write a balanced equation to represent the reaction shown in the figure.
23. The gases carbon dioxide and hydrogen can react together to form carbon monoxide gas and water vapor. Which of the diagrams in the figure could be used to represent this reaction?
Balance the following skeletal equation:
O(g)
C. 2NH3(g) + 2O2(g) → 2NO2(g) + 3H2O(g)
D. 4NH3(g) + 7O2(g) → 4NO2(g) + 6H2O(g)
E. 2NH3(g) + O2(g) → NO2(g) + 2H2O(g)
28. Balance the following skeletal equation: CH4(g) → C2H2(g) + H2(g).
A. 4CH4(g) → 2C2H2(g) + 5H
B. 2CH4(g) → C2H2(g) + 3H2(g)
C. CH4(g) → C2H2(g) + H2(g)
D. 2CH4(g) → C2H2(g) + H2(g)
E. 2CH4(g) → C2H2(g) + 2H2(g)
29. Balance the following skeletal equation: Pb(NO
30. Balance the following skeletal equation:
32. After the following equation is properly balanced, what is the coefficient in front of O2? S
(g)
A.
B. 8
C. 16
D. 3
E. 2
33. After the following equation is properly balanced, what is the coefficient in front of O2(g)?
PbS(s) + O2(g) → PbO(s) + SO2(g)
A. 1
B. 2
C. 6
D. 4
E. 3
34. When the equation shown is balanced properly, what is the coefficient in front of O2(g)? C6H14(l) + O2(g) → CO2(g) + H2O(g)
A. 6
B. 19
C. 9
D. 12
E. 7
35. When aqueous solutions of hydrochloric acid and sodium carbonate are mixed,
A. CO2 gas is produced.
B. a precipitate is formed.
C. no reaction occurs.
D. H2 gas is formed.
E. sodium metal is formed.
36. A reaction which has two elements as reactants and one compound as a product is:
A. a single-displacement reaction.
B. a decomposition reaction.
C. a combustion reaction.
D. a double-displacement reaction.
E. a combination reaction.
37. A reaction which has one element and one compound as reactants and one element and one compound as products is:
A. a double-displacement reaction.
B. a combination reaction.
C. a decomposition reaction.
D. a combustion reaction.
E. a single-displacement reaction.
38. A reaction which has one compound as a reactant and two elements as products is:
A. a decomposition reaction.
B. a combustion reaction.
C. a single-displacement reaction.
D. a combination reaction.
E. a double-displacement reaction.
39. A reaction which has two compounds as reactants and two compounds as products is:
A. a combustion reaction.
B. a single-displacement reaction.
C. a decomposition reaction.
D. a combination reaction.
E. a double-displacement reaction.
40. A solution of silver nitrate is mixed with a solution of sodium chloride, resulting in a precipitate of silver chloride and a solution of sodium nitrate. The class of this reaction is:
A. combination reaction.
B. double-displacement reaction.
C. decomposition reaction.
D. single-displacement reaction.
E. combustion reaction.
41. A piece of magnesium metal is placed in a solution of hydrochloric acid, resulting in the formation of hydrogen gas and a solution of magnesium chloride. The class of this reaction is:
A. single-displacement reaction.
B. decomposition reaction.
C. combustion reaction.
D. combination reaction.
E. double-displacement reaction.
42. A piece of magnesium metal is burned in air (containing oxygen gas), and a white powder of magnesium oxide is formed. The class of this reaction is:
A. combustion reaction.
B. single-displacement reaction.
C. decomposition reaction.
D. double-displacement reaction.
E. combination reaction.
43. Crystals of red mercury(II) oxide, when heated, form liquid mercury and oxygen gas. The class of this reaction is:
A. double-displacement reaction.
B. combination reaction.
C. single-displacement reaction.
D. decomposition reaction.
E. combustion reaction.
44. Classify the following reaction: 2C8H18(l) + 25O2(g) → 16CO2(g) + 18H2O(g)
A. combination
B. combustion
C. single-displacement
D. decomposition
E. double-displacement
45. The class of the reaction shown in the figure is:
A. double-displacement reaction.
B. decomposition reaction.
C. combustion reaction.
D. combination reaction.
E. single-displacement reaction.
46. The class of the reaction shown in the figure is:
A. double-displacement reaction.
B. combination reaction.
C. combustion reaction.
D. decomposition reaction.
E. single-displacement reaction.
47. The class of the reaction shown in the figure is:
A. combustion reaction.
B. decomposition reaction.
C. double-displacement reaction.
D. single-displacement reaction.
E. combination reaction.
48. The class of the reaction shown in the figure is:
A. combination reaction.
B. decomposition reaction.
C. double-displacement reaction.
D. single-displacement reaction.
E. combustion reaction.
49. The class of the reaction shown in the figure is:
A. combination reaction.
B. combustion reaction.
C. single-displacement reaction.
D. double-displacement reaction.
E. decomposition reaction.
50. When aqueous solutions of H2SO4 and NaOH are mixed, _______ will occur.
A. no reaction
B. a double-displacement reaction
C. a single-displacement reaction
D. a decomposition reaction
E. a combination reaction
51. Sodium metal reacts with water in a single-displacement reaction. Which of the following best describes the identity of the products of this reaction?
A. NaH(aq) and O2(g)
B. NaOH(aq) and H2(g)
C. NaOH2(aq)
D. NaH2(aq) and O(g)
E. NaOH(aq) and H(g)
52. What is the product of the combination reaction that occurs when magnesium metal reactions with oxygen gas?
A. MgO2(s)
B. Mg2O3(s)
C. Mg2O(s)
D. MgO(s)
E. Mg2O2(s)
53. What is the correct formula for the product of the combination reaction between calcium metal and oxygen gas?
A. Ca2O(s)
B. Ca2O3(s)
C. Ca2O2(s)
D. CaO(s)
E. CaO2(s)
54. What are the products of the combustion reaction of methane, CH4, with oxygen?
A. CO2(g) and H2O(g)
B. H2CO3(aq)
C. CO2(g) only
D. C(s), and H2O(g)
E. CO(g) and H2(g)
55. Write and balance the equation for the decomposition reaction that occurs when Mercury(II) oxide decomposes to its elements.
A. HgO(s) → Hg(l) + O2(g)
B. 2HgO(s) → 2Hg(l) + O2(g)
C. Hg2O(s) → 2Hg(l) + O2(g)
D. HgO2(s) → Hg(l) + 2O(g)
E. 2Hg(l) +O2(g) → HgO2(s)
56. When heated, calcium carbonate (limestone) undergoes a decomposition reaction. Write a balanced equation for this reaction.
A. CaCO3(s) → CaO(s) + CO2(g)
B. CaCO3(s) → Ca(s) + CO2(g)
C. 2CaCO3(s) → 2CaO(s) + 3CO2(g)
D. CaCO3(s) → Ca(s) + CO3(g)
E. 2CaCO3(s) → 2CaO(s) + CO2(g)
57. Write and balance the equation for the decomposition reaction that occurs when solid copper(II) hydroxide, Cu(OH)2, is heated.
A. Cu(OH)2(s) → Cu(s) + (OH)2(g)
B. Cu(OH)2(s) → Cu(s) + 2OH(g)
C. 2Cu(OH)2(s) → 2CuO(s) + H2O(g)
D. Cu(OH)2(s) → Cu(s) + H2O(g)
E. Cu(OH)2(s) → CuO(s) + H2O(g)
58. Write and balance the equation for the decomposition reaction that occurs when solid magnesium sulfate trihydrate, MgSO4 3H2O, is heated.
A. MgSO4 3H2O(s) → MgSO4(s) + 3H2O(g)
B. MgSO4 3H2O(s) → MgS(s) + 6H2O(g)
C. MgSO4 ·3H2O(s) → MgSO4 ·3H2O(s)
D. MgSO4 3H2O(s) → Mg(s) + SO4 3H2O(s)
E. MgSO4 ·3H2O(s) → MgSO4(s) + H2O(g)
59. Write and balance the equation for the combination reaction that occurs when solid potassium metal reacts with chlorine gas.
A. 2K(s) + Cl2(g) → KCl(s)
B. K(s) + Cl(g) → KCl(s)
C. 2K(s) + Cl2(g) → 2ClK(s)
D. 2K(s) + Cl2(g) → 2KCl(s)
E. K(s) + Cl2(g) → KCl(s)
60. Which of the following equations best describes the reaction that occurs when potassium metal reacts with oxygen gas in a combination reaction?
A. K(s) + O2(g) → KO2(s)
B. 4K(s) + O2(g) → 2K2O(s)
C. K(s) + O2(g) → KO(s) + O(g)
D. 2K(s) + O(g) → K2O(s)
E. K(s) + O(g) → KO(s)
61. Write and balance the equation for the combination reaction that occurs when sulfur dioxide gas, SO2, reacts with oxygen gas.
A. 3SO2(g) + 2O2(g) → 3SO3(g)
B. SO2(g) + O2(g) → SO3(g)
C. SO2(g) + O2(g) → SO4(g)
D. 2SO2(g) + 2O2(g) → 2SO3(g)
E. 2SO2(g) + O2(g) → 2SO3(g)
62. Write and balance the equation for the combination reaction that occurs when aluminum metal reacts with oxygen gas.
A. 4Al(s) + 3O2(g) → 2Al2O3(s)
B. 2Al(s) + 2O2(g) → 2AlO2(s)
C. 2Al(s) + 2O2(g) → Al2O3(s)
D. Al(s) + O2(g) → AlO(s)
63. When zinc metal is placed into a copper(II) nitrate solution, a single-displacement reaction occurs. Write a balanced equation to describe this reaction.
A.
B.
C.
D.
E.
64. When copper metal is placed into a silver nitrate solution, a single-displacement reaction occurs, forming a copper(II) compound. Write a balanced equation to describe this reaction.
A. Cu(s) + 2AgNO3(aq) → Cu(NO3)2(aq) + 2Ag(s)
B. Cu(s) + Ag(NO3)2(aq) → CuNO3(aq) + AgNO3(aq)
C. Cu(s) + Ag(NO3)2(aq) → Cu(NO3)2(aq) + Ag(s)
D. 2Cu(s) + Ag(NO3)2(aq) → 2Cu(NO3)2(aq) + Ag(s)
E. Cu(s) + AgNO3(aq) → CuNO3(aq) + Ag(aq)
65. When calcium metal is placed in water, a single-displacement reaction occurs. Write a balanced equation to describe this reaction.
A. Ca(s) + H2O(l) → Ca(OH)2(aq) + H2(g)
B. Ca(s) + H2O(l) → CaO(s) + H2(g)
C. Ca(s) + H2O(l) → CaO(aq) + H2(g)
D. 2Ca(s) + 2H2O(l) → 2Ca(OH)2(aq) + H2(g)
E. Ca(s) + 2H2O(l) → Ca(OH)2(aq) + H2(g)
66. Predict which of the following reactions will occur?
A. All three will occur.
B. i only
C. iii only
D. ii only
E. ii and iii
67. Which of the metals (Fe, Zn, Mg) will react in an aqueous solution of Al(NO3)3 to produce aluminum metal?
A. Zn
B. Mg
C. Fe
D. None of these
E. All of these
68. When potassium metal is placed in water, will a reaction occur? If so, what is the balanced equation for the reaction?
A. Yes. 2K(s) + 2H2O(l) → 2KOH(aq) + H2(g)
B. Yes. 2K(s) + 2H2O(l) → 2KH2O(aq)
C. Yes. 2K(s) + 2H2O(l) → 2KOH(aq) + 2H2(g)
D. No reaction will occur.
E. Yes. 2K(s) + 2H2O(l) → 2K(OH)2(aq) + H2(g)
69. When iron metal is placed into a solution of hydrochloric acid, will a reaction occur? If so, what is the balanced equation for the reaction?
A. Yes. Fe(s) + 2HCl(aq) → FeCl2(aq) + H2(g)
B. Yes. Fe(s) + 3HCl(aq) → FeCl3(aq) + H2(g)
C. No reaction will occur.
D. Yes. 2Fe(s) + 2HCl(aq) → 2FeCl(aq) + H2(g)
70. When copper metal is placed in a solution of zinc nitrate, will a reaction occur? If so, what is the balanced equation for the
reaction?
A.
C.
D.
71. When copper metal is placed in a solution of platinum(II) chloride, will a reaction occur? If so, what is the balanced equation for the reaction?
A.
B.
C.
D.
E.
72. When aqueous solutions of sodium chloride and silver nitrate are mixed, a double-displacement reaction occurs. What is the balanced equation for the reaction?
A. NaCl(aq) + AgNO
B. NaCl(aq) + AgNO
C. NaCl(aq) + AgNO
(aq) + AgCl(s)
D. NaCl(aq) + AgNO3(aq) → NaNO3(aq) + 3AgCl(s)
E. NaCl(aq) + AgNO3(aq) → Na(s) + AgNO3Cl(aq)
73. When aqueous solutions of potassium chloride and lead(II) nitrate are mixed, a double-displacement reaction occurs. What is the balanced equation for the reaction?
A. KCl(aq) + Pb2NO3(aq) → KNO3(aq) + PbCl(aq)
B. KCl(aq) + Pb(NO
C. KCl(aq) + Pb
D. 2KCl(aq) + Pb(NO
E. 2KCl(aq) + Pb(NO
(aq) → K(s) + PbNO
(aq) → KNO
)
Cl(aq)
(aq) + 2PbCl(s)
(aq) → KNO
(aq) + ClPb(s)
)
(aq) → 2KNO
74. If solutions of potassium carbonate and calcium nitrate are mixed, will a double-displacement reaction occur? If so, what is the balanced equation for the reaction?
75. If solutions of potassium chromate and calcium nitrate are mixed, will a double-displacement reaction occur? If so, what is the balanced equation for the reaction?
76. Which of the following ionic compounds would be expected to be insoluble in water?
77. Which of the following ionic compounds would be expected to be insoluble in water?
A. NH4NO3
B. PbI2
C. NaCH3CO2
D. KCl
E. CuSO4
78. Which of the following ionic compounds would be expected to be insoluble in water?
A. NaOH
B. KI
C. CaS
D. Ca(NO3)2
E. Na2SO4
79. Consider the reaction
). The driving force that causes the reaction to go to completion is:
A. formation of a soluble salt.
B. formation of an element.
C. formation of an insoluble gas.
D. formation of a precipitate.
E. none of these.
80. Consider the reaction Ca(OH)2(aq) + 2HCl(aq) →
). The driving force that causes the reaction to go to completion is:
A. formation of water.
B. formation of a soluble salt.
C. formation of a precipitate.
D. formation of an insoluble gas.
E. formation of an element.
81. When aqueous solutions of K2CO3 and CaCl2 are mixed, what is the correct formula for the precipitate that forms?
A. ClCO3(s)
B. KCl(s)
C. K2Cl2(s)
D. CaCO3(s)
E. K2Ca(s)
82. When aqueous solutions of NaOH and MgCl2 are mixed, a precipitate forms. What is the correct formula for the precipitate?
A. Mg(OH)2(s)
B. NaCl(s)
C. NaCl2(s)
D. MgOH(s)
E. MgCl2(s)
83. Complete and balance the equation for the reaction that occurs when HCl(aq) and Mg(OH)2(aq) are mixed. This reaction occurs in your stomach if you take Milk of Magnesia®.
A. 2HCl(aq) + Mg(OH)2(aq) → MgCl2(aq) + 2H2O(l)
B. HCl(aq) + Mg(OH)2(aq) → MgCl(aq) + H2O(l)
C. 2HCl(aq) + Mg(OH)2(aq) → MgCl2(aq) + H2(g)
D. 2HCl(aq) + Mg(OH)2(aq) → MgCl2(aq) + H2O(l)
E. HCl(aq) + Mg(OH)2(aq) → MgCl2(aq) + H2O(l)
84. Complete and balance the equation for the reaction that occurs when H2SO4(aq) and NaOH(aq) are mixed.
A. H2SO4(aq) + 2NaOH(aq) → Na2SO4(aq) + 2H2O(l)
B. H2SO4(aq) + 2NaOH(aq) → Na2SO4(aq) + H2O(l)
C. 2H2SO4(aq) + 2NaOH(aq) → Na2SO4(aq) + 2H2O(l)
D. H2SO4(aq) + NaOH(aq) → NaSO4(aq) + H2O(l)
E. H2SO4(aq) + NaOH(aq) → NaSO4(aq) + H2(g)
85. Complete and balance the equation for the reaction that occurs when HBr(aq) and KOH(aq) are mixed.
A. 2HBr(aq) + KOH(aq) → Br2(l) + H2O(l)
B. HBr(aq) + KOH(aq) → KBr(aq) + H2O(l)
C. 2HBr(aq) + KOH(aq) → KBr(aq) + H2O(l)
D. HBr(aq) + KOH(aq) → BrOH(aq) + KH(aq)
E. HBr(aq) + KOH(aq) → KBrO(aq) + H2(g)
86. When powdered sulfur burns in air, a purple flame is produced, as well as a toxic, foul-smelling gas. Write a balanced equation for the reaction between sulfur and oxygen gas.
A. S8(s) + O2(g) → SO2(g)
B. S8(s) + 4O2(g) → 8SO2(g)
C. S8(s) + 8O2(g) → 8SO2(g)
D. 2S8(s) + 8O2(g) → 8SO2(g)
87. When acetylene gas, C2H2, burns in air, a combustion reaction occurs. Write a balanced equation to represent this reaction, which occurs when welding torches are used.
A.
B.
C.
88. Sterno, or “canned heat,” contains methanol, CH3OH, and is used for heating containers of food. Write a balanced equation to represent the combustion reaction that occurs when methanol burns in air.
89. Would an aqueous solution of CH3OH contain ions? If so, indicate the formulas of the ions in the solution.
A. Yes. CH4 +(aq) + O (aq)
B. Yes. CH3 (aq) + OH+(aq)
C. Yes. CH3 +(aq) + OH (aq)
D. Yes. CH42+(aq) + O2 (aq)
E. No, this substance would not form ions in solution.
90. Would an aqueous solution of K2SO4 contain ions? If so, indicate the formulas of the ions in the solution.
A. Yes. 2K+(aq) + S2 (aq) + 4O2 (aq)
B. No, this substance would not form ions in solution.
C. Yes. K22+(aq) + SO42 (aq)
D. Yes. 2K+(aq) + SO42 (aq)
E. Yes. K2 +(aq) + SO4 (aq)
91. Would an aqueous solution of KOH contain ions? If so, indicate the formulas of the ions in the solution.
A. Yes. K+(aq) + O2 (aq) + H+(aq)
B. No, this substance would not form ions in solution.
C. Yes. K+(aq) + H2O(l)
D. Yes. K+(aq) + OH (aq)
E. Yes. K (aq) + OH+(aq)
92. When writing a net ionic equation, how would Mg(NO3)2(aq) be represented?
A. Mg2+(aq) + (NO3)2 –(aq)
B. Mg2+(aq) + 2NO3 –(aq)
C. Mg(aq) + N2(aq) + 3O2(aq)
D. Mg2+(aq) + 2N3–(aq) + 6O2–(aq)
E. Mg2+(aq) + NO3 –(aq)
93. Write and balance a net ionic equation for the reaction between hydrochloric acid and potassium hydroxide.
A. H+(aq) + OH (aq) → H2O(l)
B. H+(aq) + O2 (aq) → OH (aq)
C. HCl(aq) + KOH(aq) → KCl(aq) + H2O(l)
D. Cl (aq) + OH+(aq) → OHCl(aq)
E. K+(aq) + Cl (aq) → KCl(aq)
94. Write and balance a net ionic equation for the reaction between iron(II) chloride and potassium hydroxide to form iron(II) hydroxide and potassium chloride.
A. Fe2Cl(aq) + OH (aq) → FeOH(s) + Cl (aq)
B. Fe2+(aq) + 2OH (aq) → Fe(OH)2(s)
C. 2Cl (aq) + 2K+(aq) → 2KCl(s)
D. 2Cl (aq) + 2K+(aq) → 2K(s) + Cl2(g)
E. Fe2+(aq) + OH (aq) → FeOH(s)
95. Write and balance a net ionic equation for the reaction between copper(II) chloride and zinc metal to form copper metal and zinc chloride.
A. Cu2Cl(aq) + Zn(s) → 2Cu(s) + Zn+(aq) + Cl (aq)
B. Cu2+(aq) + 2Cl (aq) + Zn(s) → Cu(s) + Zn2+(aq) + 2Cl (aq)
C. Cu2+(aq) + Zn(s) → Cu(s) + Zn2+(aq)
D. 2Cu+(aq) + Zn(s) → 2Cu(s) + Zn2+(aq)
E. CuCl+(aq) + Zn(s) → Cu(s) + Zn2+(aq) + Cl (aq)
96. Identify the spectatorion(s) in the following reaction: Zn(s) + Cu(NO3)2(aq) → Cu(s) + Zn(NO3)2(aq)
A. Cu2+(aq) and NO3 –(aq)
B. Zn2+(aq) and Cu2+(aq)
C. Zn2+(aq) and NO3 –(aq)
D. NO3 –(aq) only
E. There are no spectatorions.
97. Identify the spectatorions in the following reaction: Zn(s) + 2HNO3(aq) → Zn(NO3)2(aq) + H2(g)
A. NO3 –(aq)only
B. There are no spectatorions.
C. Zn2+(aq) and NO3 –(aq)
D. Zn2+(aq) only
E. H+(aq) and NO3 –(aq)
98. Identify the spectatorions in the following reaction: H2SO4(aq) + 2KOH(aq) → K2SO4(aq) + 2H2O(l)
A. There are no spectatorions.
B. SO42–(aq) only
C. K+(aq), NO3 –(aq) , H+(aq), and OH–(aq)
D. H+(aq) and OH–(aq)
99. When balancing a chemical equation, it is acceptable to change the subscripts on the formulas of the skeletal equation.
True False
100. When one compound is converted into two elements during a chemical reaction, a decomposition reaction has occurred.
True False
101. When two compounds react to form two new compounds as products, no reaction has occurred.
True False
102. The molecular-level diagram shows a combination reaction occurring.
True False
103. When aqueous solutions of barium chloride and sodium sulfate are mixed, no reaction will occur.
True False
104. The molecular-level diagram shows a substance which is a nonelectrolyte.
True False
105. When writing a net ionic equation, Cu(s) is the same as Cu2+(aq), so if these species appear on opposite sides of the equation, they would be cancelled.
True False
106. The activity series is used to predict if a proposed double-displacement reaction will occur.
True False
107. The compound PbCl2 would be expected to be water-soluble.
True False
108. The net ionic equation for the acid-base neutralization reaction between HCl(aq) and NaOH(aq) is: H+(aq) + OH (aq) → H2O(l).
True False
109. Examine the photograph. Note any evidence of the occurrence of a chemical reaction.
110. Examine the molecular-level diagram. Has a chemical reaction occurred?
111. Examine the molecular-level diagram. Is this chemical reaction or a physical change?
112. Write a complete, balanced equation for the reaction that occurs when solutions of potassium hydrogen carbonate and hydroiodic acid react to form potassium iodide, water, and carbon dioxide. What are the coefficients in the balanced equation?
113. What is the class of the reaction in question 112?
114. Write a complete, balanced equation for the reaction that occurs when aluminum metal reacts with oxygen gas to form aluminum oxide. What are the coefficients in the balanced equation? __Al(s) + __O2(g) → __Al2O3(s)
115. What is the class of the reaction in question 114?
116. Balance the skeletal equation given for the reaction of octane, C8H18, a component of gasoline with oxygen gas: __C8H18(l) + __O2(g) → __CO2(g) + __H2O(l) What are the coefficients in the balanced equation?
117. What is the class of the reaction in question 116?
118. Balance the skeletal equation given for the reaction of magnesium metal with hydrochloric acid: __Mg(s) + __HCl(aq) → __MgCl2(aq) + __H2(g) What are the coefficients in the balanced equation?
119. What is the class of the reaction in question 118?
120. A reaction occurs when a piece of silvery metal is placed in a solution of HCl(aq). Is the metal zinc or silver? What tool would you use to make a decision?
121. Indicate whether KOH(aq) is an electrolyte or a nonelectrolyte.
122. Indicate whether HBr(aq) is an electrolyte or a nonelectrolyte.
123. Indicate whether CH3OH(aq) is an electrolyte or a nonelectrolyte.
124. Indicate whether CaCl2(aq) is an electrolyte or a nonelectrolyte
125. Would an aqueous solution of (NH4)2CO3 contain ions? If so, how many ions would occur per formula unit of the compound?
126. Would an aqueous solution of MgBr2 contain ions? If so, how many ions would occur per formula unit of the compound?
127. Would an aqueous solution of C2H5OH contain ions? Is it an electrolyte or a nonelectrolyte?
128. Predict whether a reaction will occur when aqueous solutions of silver nitrate and potassium bromide are mixed. Of silver ion, nitrate ion, potassium ion, and bromide ion, which are spectator ions?
129. Predict whether a reaction will occur when a piece of copper metal is placed into an aqueous solution of silver nitrate. Of the possible ions, silver ion, copper ion, and nitrate ion, which are spectator ions?
1. Identify which image in the figure represents the reactants and which image therefore represents the products in the reaction between xenon gas and fluorine gas to form xenon tetrafluoride gas.
A. upper right image = reactants, upper left image = products
B. lower left image = reactants, upper left image = products
C. upper left image = reactants, upper right image = products
D. upper left image = reactants, lower left image = products
E. upper left image = reactants, lower right image = products
Bloom's: 2. Understanding
Difficulty: Medium
Subtopic: Writing and Balancing Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
2. Identify which image in the figure represents the reactants and which image therefore represents the products in the reaction between ozone gas (O3) and carbon monoxide gas to form oxygen gas and carbon dioxide gas.
A. upper left image = reactants, upper right image = products
B. upper right image = reactants, upper left image = products
C. lower left image = reactants, lower right image = products
D. upper left image = reactants, lower right image = products
E. upper left image = reactants, lower left image = products
Bloom's: 2. Understanding
Difficulty: Medium
Subtopic: Writing and Balancing Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
3. The figure shows the chemical reaction between nitrogen gas and hydrogen gas to produce ammonia (NH3) gas. Which of the following changes would make the diagram correctly represent conservation of mass?
A. Add one H2 molecule from the image on the left.
B. Add three NH3 molecules to the image on the right.
C. Add three H2 molecules t the image on the right.
D. Remove one H2 molecules from the image on the left.
E. Remove one NH3 molecule from the image on the left.
Bloom's: 3. Apply
Difficulty: Hard
Subtopic: Writing and Balancing Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
4. The figure shows a reaction between methane gas (natural gas, CH4) and oxygen to produce carbon dioxide and water. Is the diagram accurate,
and if not, what is wrong with it, and how could it be fixed?
A. There are too many hydrogen atoms on the right-hand side of the reaction arrow. Remove one hydrogen atom from each water molecule.
B. There are too many oxygen atoms on the right-hand side of the reaction arrow. Remove one oxygen atom from the carbon dioxide.
C. The diagram is accurate as shown.
D. There are not enough carbon atoms on the left-hand side of the reaction arrow. Add another methane molecule on the left, and then another carbon dioxide molecule on the right of the arrow.
E. There are not enough oxygen molecules on the left-hand side of the reaction arrow. Add another oxygen molecule on the left of the arrow, and another water molecule on the right.
Bloom's: 3. Apply
Difficulty: Hard
Subtopic: Writing and Balancing Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
5. The figure shows a reaction between hydrogen and oxygen gases to produce water. Is the diagram accurate, and if not, what is wrong with it, and how could it be fixed?
A. There are too many water molecules on the right. Remove one water molecule from the image on the right.
B. There are not enough oxygen atoms on the right. Add one more water molecule to the right image.
C. There are too many oxygen atoms in the image on the left. Remove one oxygen molecule.
D. There are not enough hydrogen atoms on the right. Add one more water molecule to the left image, and one more hydrogen molecule to the right image.
E. The diagram is accurate as shown.
Bloom's: 3. Apply
Difficulty: Hard
Subtopic: Writing and Balancing Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
6. The figure shows a reaction between xenon gas and fluorine gas. Is the diagram correct, and if not, how could it be modified to show that the law of conservation of mass is obeyed?
A. Add two more XeF4 molecules and two more Xe atoms to the right image.
B. Add four more XeF4 molecules to the right image.
C. Add three more XeF4 molecules and one more Xe atom to the right image.
D. Add one more XeF4 molecule and three more Xe atoms to the right image.
E. The diagram is accurate as shown.
Bloom's: 3. Apply
Difficulty: Hard
Subtopic: Writing and Balancing Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
7. Sulfur dioxide gas reacts with oxygen gas to form sulfur trioxide gas. What would the products of the reaction be, if the reactants are those shown in the figure?
A. 2 molecules of sulfur trioxide, and 2 molecules of sulfur dioxide
B. 4 molecules of sulfur trioxide, and 1 molecule of oxygen
C. 3 molecules of sulfur trioxide, and 1 molecule of oxygen
D. 3 molecules of sulfur trioxide, and 1 molecule of sulfur dioxide
E. 4 molecules of sulfur trioxide
Bloom's: 3. Apply
Difficulty: Hard
Subtopic: Writing and Balancing Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
8. Gaseous nitrogen monoxide reacts with oxygen gas to form brown nitrogen dioxide gas. What would the products of the reaction be, if the reactants are those shown in the figure?
A. 6 molecules of nitrogen dioxide
B. 5 molecules of nitrogen dioxide, and 1 molecule of oxygen
C. 6 molecules of nitrogen dioxide, and 1 molecule of oxygen
D. 4 molecules of nitrogen dioxide, and 2 molecules of nitrogen monoxide
E. 3 molecules of nitrogen dioxide, and 3 molecules of nitrogen monoxide
Bloom's: 3. Apply
Difficulty: Hard
Subtopic: Writing and Balancing Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
9. Which of the following changes represents a physical change, rather than evidence of a chemical reaction?
A. When a piece of zinc metal is placed in a solution of HCl, bubbles begin to form, and the zinc begins to dissolve.
B. When solid ammonium carbonate, (NH4)2CO3, is heated, the solid disappears, and gaseous ammonia (NH3), carbon dioxide (CO2), and water (H2O) are formed.
C. When dry ice (solid CO2) is allowed to stand at room temperature, a white cloud and gaseous CO2 are formed.
D. When a solution of KI is mixed with a solution of Pb(NO3)2, a yellow solid is formed.
E. When a piece of copper wire is placed in a solution of AgNO3, a silvery solid begins to form on the surface of the wire, and the solution turns blue.
Bloom's: 3. Apply
Difficulty: Medium
Subtopic: Classification and States of Matter
Subtopic: Properties of Matter
Subtopic: Writing and Balancing Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
Topic: Study of Chemistry
10. Which of the following changes represents a physical change, rather than evidence of a chemical reaction?
A. When water and a yellow solution of antifreeze are mixed, the resulting solution is a lighter shade of yellow than the original antifreeze solution.
B. When concentrated HNO3 is placed in contact with copper metal, a brown gas is formed, the copper dissolves, and a green solution is formed.
C. When an egg is fried, the clear part becomes white, and the egg becomes a solid.
D. When a piece of zinc metal is placed in a blue solution of copper sulfate, the solution turns from blue to colorless, the zinc dissolves, and copper metal is formed.
E. When solutions of AgNO3 and NaCl are mixed, a white solid forms.
Bloom's: 3. Apply
Difficulty: Medium
Subtopic: Classification and States of Matter
Subtopic: Properties of Matter
Subtopic: Writing and Balancing Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
Topic: Study of Chemistry
11. In the figure shown, is a chemical reaction occurring?
A. No, because there are the same number of atoms in both images.
B. Yes, because the atoms have rearranged, and therefore the formulas of the products and reactants are different.
C. No, because there are oxygen atoms and nitrogen atoms in both images.
D. No, because both the reactants and products are colorless gases.
E. Yes, because the reactants are gases, but the product is a solid.
Bloom's: 3. Apply
Difficulty: Medium
Subtopic: Writing and Balancing Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
12. In the figure shown, is a chemical reaction occurring?
A. Yes, because the Na+ and Cl- ions are being removed from their ionic lattice as they are dissolved.
B. Yes, because the water molecules are reacting with the Na+ and Cl- ions to form a gas.
C. Yes, because a precipitate will be formed when the water and NaCl are mixed.
D. No, because there is no change occurring.
E. No, because the Na+ and Cl- ions are simply being surrounded by the water molecules as the salt dissolves.
Bloom's: 3. Apply
Difficulty: Easy
Subtopic: Writing and Balancing Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
13. In the figure shown, is a chemical reaction occurring?
A. No, because there are the same number of atoms in both images.
B. Yes, because the atoms have rearranged, and therefore the formulas of the products and reactants are different.
C. No, because both the reactants and products are colorless gases.
D. No, because there are oxygen atoms and carbon atoms in both images.
E. Yes, because the reactants are gases, but the product is a solid.
Bloom's: 3. Apply
Difficulty: Easy
Subtopic: Writing and Balancing Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
14. Consider the following chemical equations. Select the equations that represent chemical reactions, rather than physical changes.
A. I and III only
B. II and III only
C. I, II, and III
D. I only
E. I and II only
Bloom's: Understand
Difficulty: Medium
Subtopic: Classification and States of Matter
Subtopic: Properties of Matter
Subtopic: Writing and Balancing Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
Topic: Study of Chemistry
15. Consider the following chemical equations. Select the equations that represent chemical reactions, rather than physical changes.
A. I, II, and III
B. I and II only
C. I and III only
D. I only
E. II and III only
Bloom's: Understand
Difficulty: Medium
Subtopic: Classification and States of Matter
Subtopic: Properties of Matter
Subtopic: Writing and Balancing Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
Topic: Study of Chemistry
16. Consider the following chemical equations. Select the equations that represent chemical reactions, rather than physical changes.
A. II only
B. I, II, and III
C. I and III only
D. I and II only
E. II and III only
Bloom's: Understand
Difficulty: Medium
Subtopic: Classification and States of Matter
Subtopic: Properties of Matter
Subtopic: Writing and Balancing Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
Topic: Study of Chemistry
17. Write a complete, balanced equation for the reaction that occurs when sodium metal reacts with water to form hydrogen gas and aqueous sodium hydroxide.
A. Na(s) + 2H2O(l) → 2NaOH(aq) + 2H2(g)
B. Na(s) + 2H2O(l) → NaOH(aq) + 2H2(g)
C. Na(s) + H2O(l) → NaOH(aq) + H2(g)
D. Na(s) + H2O(l) → NaOH(aq) + H(g)
E. 2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)
Bloom's: 3. Apply
Difficulty: Medium
Subtopic: Writing and Balancing Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
18. Fireworks which give off bright flashes of white light often contain magnesium metal. When the magnesium burns in the presence of oxygen, it forms solid magnesium oxide, and emits a bright white light. Write a complete, balanced equation for this reaction.
A. Mg(s) + O(g) → MgO(s)
B. 4Mg(s) + O2(g) → 2Mg2O(s)
C. 2Mg(s) + O2(g) → 2MgO(s)
D. Mg(s) + O2(g) → MgO2(s)
E. Mg(s) + O2(g) → MgO(s)
Bloom's: 3. Apply
Difficulty: Medium
Subtopic: Writing and Balancing Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
19. Zinc metal will react with aqueous hydrochloric acid to produce aqueous zinc chloride and hydrogen gas. Write a complete, balanced equation for this reaction.
A. Zn(s) + 2HCl(aq) → ZnCl(aq) + H2(g)
B. Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)
C. Zn(s) + HCl(aq) → ZnCl(aq) + H(g)
D. 2Zn(s) + 2HCl(aq) → 2ZnCl(aq) + H2(g)
E. Zn(s) + HCl(aq) → ZnCl(aq) + H2(g)
Bloom's: 3. Apply
Difficulty: Medium
Subtopic: Writing and Balancing Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
20. When solid ammonium carbonate is heated, it decomposes to form ammonia gas, carbon dioxide gas, and water vapor, so that the solid completely disappears. Write a complete, balanced equation for this reaction.
Bloom's: 3. Apply Difficulty: Medium
Subtopic: Writing and Balancing Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
21. Write a balanced equation to represent the reaction shown in the figure.
Bloom's: 3. Apply
Difficulty: Medium
Subtopic: Writing and Balancing Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
22. Write a balanced equation to represent the reaction shown in the figure.
A. 4CH3 + 6O2 → 4CO2 + 6H2O
B. 3CH4 + 6O2 → 3CO2 + 6H2O
C. 3CH3 + 6O2 → 3CO2 + 6H2O
D. 3CH4 + 5O2 → 3CO2 + 5H2O
E. 3CH4 + 6O2 → 3CO + 6H2O
Bloom's: 3. Apply
Difficulty: Easy
Subtopic: Writing and Balancing Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
23. The gases carbon dioxide and hydrogen can react together to form carbon monoxide gas and water vapor. Which of the diagrams in the figure could be used to represent this reaction?
A. D
B. A
C. B
D. none of these
E. C
Bloom's: 3. Apply
Difficulty: Easy
Subtopic: Writing and Balancing Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
24. Balance the following skeletal equation:
Topic:
g)
Bloom's: 3. Apply
Difficulty: Medium
Subtopic: Writing and Balancing Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
32. After the following equation is properly balanced, what is the coefficient in front of O2?
S8(s) + O2(g) → SO3(g)
A. 12
B. 8
C. 16
D. 3
E. 2
Bloom's: 3. Apply
Difficulty: Medium
Subtopic: Writing and Balancing Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
33. After the following equation is properly balanced, what is the coefficient in front of O2(
C. 6
D. 4
E. 3
Bloom's: 3. Apply
Difficulty: Medium
Subtopic: Writing and Balancing Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
34. When the equation shown is balanced properly, what is the coefficient in front of O
B. 19
C. 9
D. 12
E. 7
Bloom's: 3. Apply
Difficulty: Hard
Subtopic: Writing and Balancing Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
35. When aqueous solutions of hydrochloric acid and sodium carbonate are mixed,
A. CO2 gas is produced.
B. a precipitate is formed.
C. no reaction occurs.
D. H2 gas is formed.
E. sodium metal is formed.
Bloom's: 3. Apply
Difficulty: Medium
Subtopic: Types of Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
36. A reaction which has two elements as reactants and one compound as a product is:
A. a single-displacement reaction.
B. a decomposition reaction
C. a combustion reaction.
D. a double-displacement reaction.
E. a combination reaction.
Bloom's: 2. Understanding
Difficulty: Easy
Subtopic: Types of Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
37. A reaction which has one element and one compound as reactants and one element and one compound as products is:
A. a double-displacement reaction.
B. a combination reaction.
C. a decomposition reaction.
D. a combustion reaction.
E. a single-displacement reaction.
Bloom's: Understand
Difficulty: Easy
Subtopic: Types of Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
38. A reaction which has one compound as a reactant and two elements as products is:
A. a decomposition reaction.
B. a combustion reaction.
C. a single-displacement reaction.
D. a combination reaction.
E. a double-displacement reaction.
Bloom's: Understand
Difficulty: Easy
Subtopic: Types of Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
39. A reaction which has two compounds as reactants and two compounds as products is:
A. a combustion reaction.
B. a single-displacement reaction.
C. a decomposition reaction.
D. a combination reaction.
E. a double-displacement reaction.
Bloom's: Understand
Difficulty: Easy
Subtopic: Types of Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
40. A solution of silver nitrate is mixed with a solution of sodium chloride, resulting in a precipitate of silver chloride and a solution of sodium nitrate. The class of this reaction is:
A. combination reaction.
B. double-displacement reaction.
C. decomposition reaction.
D. single-displacement reaction.
E. combustion reaction.
Bloom's: Understand
Difficulty: Medium
Subtopic: Types of Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
41. A piece of magnesium metal is placed in a solution of hydrochloric acid, resulting in the formation of hydrogen gas and a solution of magnesium chloride. The class of this reaction is:
A. single-displacement reaction.
B. decomposition reaction.
C. combustion reaction.
D. combination reaction.
E. double-displacement reaction.
Bloom's: Understand
Difficulty: Medium
Subtopic: Types of Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
42. A piece of magnesium metal is burned in air (containing oxygen gas), and a white powder of magnesium oxide is formed. The class of this reaction is:
A. combustion reaction.
B. single-displacement reaction.
C. decomposition reaction.
D. double-displacement reaction.
E. combination reaction.
Bloom's: 2. Understanding
Difficulty: Medium
Subtopic: Types of Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
43. Crystals of red mercury(II) oxide, when heated, form liquid mercury and oxygen gas. The class of this reaction is:
A. double-displacement reaction.
B. combination reaction.
C. single-displacement reaction.
D. decomposition reaction.
E. combustion reaction.
Bloom's: 2. Understanding
Difficulty: Medium
Subtopic: Types of Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
44. Classify the following reaction: 2C8H18(l) + 25O2(g) → 16CO2(g) + 18H2O(g)
A. combination
B. combustion
C. single-displacement
D. decomposition
E. double-displacement
Bloom's: 2. Understanding
Difficulty: Easy
Subtopic: Types of Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
45. The class of the reaction shown in the figure is:
A. double-displacement reaction.
B. decomposition reaction.
C. combustion reaction.
D. combination reaction.
E. single-displacement reaction.
Bloom's: 2. Understanding
Difficulty: Medium
Subtopic: Types of Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
46. The class of the reaction shown in the figure is:
A. double-displacement reaction.
B. combination reaction.
C. combustion reaction.
D. decomposition reaction.
E. single-displacement reaction.
Bloom's: 2. Understanding
Difficulty: Medium
Subtopic: Types of Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
47. The class of the reaction shown in the figure is:
A. combustion reaction.
B. decomposition reaction.
C. double-displacement reaction.
D. single-displacement reaction.
E. combination reaction.
Bloom's: 2. Understanding
Difficulty: Medium
Subtopic: Types of Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
48. The class of the reaction shown in the figure is:
A. combination reaction.
B. decomposition reaction.
C. double-displacement reaction.
D. single-displacement reaction.
E. combustion reaction.
Bloom's: 2. Understanding
Difficulty: Medium
Subtopic: Types of Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
49. The class of the reaction shown in the figure is:
A. combination reaction.
B. combustion reaction.
C. single-displacement reaction.
D. double-displacement reaction.
E. decomposition reaction.
Bloom's: 2. Understanding
Difficulty: Medium
Subtopic: Types of Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
50. When aqueous solutions of H2SO4 and NaOH are mixed, _______ will occur.
A. no reaction
B. a double-displacement reaction
C. a single-displacement reaction
D. a decomposition reaction
E. a combination reaction
Bloom's: 2. Understanding
Difficulty: Easy
Subtopic: Types of Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
51. Sodium metal reacts with water in a single-displacement reaction. Which of the following best describes the identity of the products of this reaction?
A. NaH(aq) and O2(g)
B. NaOH(aq) and H2(g)
C. NaOH2(aq)
D. NaH2(aq) and O(g)
E. NaOH(aq) and H(g)
Bloom's: 3. Apply
Difficulty: Medium
Subtopic: Types of Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
52. What is the product of the combination reaction that occurs when magnesium metal reactions with oxygen gas?
A. MgO2(s)
B. Mg2O3(s)
C. Mg2O(s)
D. MgO(s)
E. Mg2O2(s)
Bloom's: 3. Apply
Difficulty: Easy
Subtopic: Types of Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
53. What is the correct formula for the product of the combination reaction between calcium metal and oxygen gas?
A. Ca2O(s)
B. Ca2O3(s)
C. Ca2O2(s)
D. CaO(s)
E. CaO2(s)
Bloom's: 3. Apply
Difficulty: Easy
Subtopic: Types of Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
54. What are the products of the combustion reaction of methane, CH4, with oxygen?
A. CO2(g) and H2O(g)
B. H2CO3(aq)
C. CO2(g) only
D. C(s), and H2O(g)
E. CO(g) and H2(g)
Bloom's: 3. Apply
Difficulty: Medium
Subtopic: Types of Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
55. Write and balance the equation for the decomposition reaction that occurs when Mercury(II) oxide decomposes to its elements.
A. HgO(s) → Hg(l) + O2(g)
B. 2HgO(s) → 2Hg(l) + O2(g)
C. Hg2O(s) → 2Hg(l) + O2(g)
D. HgO2(s) → Hg(l) + 2O(g)
E. 2Hg(l) +O2(g) → HgO2(s)
Bloom's: 3. Apply
Difficulty: Easy
Subtopic: Types of Chemical Reactions
Subtopic: Writing and Balancing Chemical Equations
Topic: Stoichiometry and Chemical Reactions
56. When heated, calcium carbonate (limestone) undergoes a decomposition reaction. Write a balanced equation for this reaction.
A. CaCO3(s) → CaO(s) + CO2(g)
B. CaCO3(s) → Ca(s) + CO2(g)
C. 2CaCO3(s) → 2CaO(s) + 3CO2(g)
D. CaCO3(s) → Ca(s) + CO3(g)
E. 2CaCO3(s) → 2CaO(s) + CO2(g)
Bloom's: 3. Apply
Difficulty: Easy
Subtopic: Types of Chemical Reactions
Subtopic: Writing and Balancing Chemical Equations
Topic: Stoichiometry and Chemical Reactions
57. Write and balance the equation for the decomposition reaction that occurs when solid copper(II) hydroxide, Cu(OH)2, is heated.
A. Cu(OH)2(s) → Cu(s) + (OH)2(g)
B. Cu(OH)2(s) → Cu(s) + 2OH(g)
C. 2Cu(OH)2(s) → 2CuO(s) + H2O(g)
D. Cu(OH)2(s) → Cu(s) + H2O(g)
E. Cu(OH)2(s) → CuO(s) + H2O(g)
Bloom's: 3. Apply
Difficulty: Medium
Subtopic: Types of Chemical Reactions
Subtopic: Writing and Balancing Chemical Equations
Topic: Stoichiometry and Chemical Reactions
58. Write and balance the equation for the decomposition reaction that occurs when solid magnesium sulfate trihydrate, MgSO4 3H2O, is heated.
A. MgSO4 3H2O(s) → MgSO4(s) + 3H2O(g)
B. MgSO4 ·3H2O(s) → MgS(s) + 6H2O(g)
C. MgSO4 3H2O(s) → MgSO4 3H2O(s)
D. MgSO4 ·3H2O(s) → Mg(s) + SO4 ·3H2O(s)
E. MgSO4 3H2O(s) → MgSO4(s) + H2O(g)
Bloom's: 3. Apply
Difficulty: Medium
Subtopic: Types of Chemical Reactions
Subtopic: Writing and Balancing Chemical Equations
Topic: Stoichiometry and Chemical Reactions
59. Write and balance the equation for the combination reaction that occurs when solid potassium metal reacts with chlorine gas.
A. 2K(s) + Cl2(g) → KCl(s)
B. K(s) + Cl(g) → KCl(s)
C. 2K(s) + Cl2(g) → 2ClK(s)
D. 2K(s) + Cl2(g) → 2KCl(s)
E. K(s) + Cl2(g) → KCl(s)
Bloom's: 3. Apply
Difficulty: Easy
Subtopic: Types of Chemical Reactions
Subtopic: Writing and Balancing Chemical Equations
Topic: Stoichiometry and Chemical Reactions
60. Which of the following equations best describes the reaction that occurs when potassium metal reacts with oxygen gas in a combination reaction?
A. K(s) + O2(g) → KO2(s)
B. 4K(s) + O2(g) → 2K2O(s)
C. K(s) + O2(g) → KO(s) + O(g)
D. 2K(s) + O(g) → K2O(s)
E. K(s) + O(g) → KO(s)
Bloom's: 3. Apply
Difficulty: Easy
Subtopic: Types of Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
61. Write and balance the equation for the combination reaction that occurs when sulfur dioxide gas, SO2, reacts with oxygen gas.
A. 3SO2(g) + 2O2(g) → 3SO3(g)
B. SO2(g) + O2(g) → SO3(g)
C. SO2(g) + O2(g) → SO4(g)
D. 2SO2(g) + 2O2(g) → 2SO3(g)
E. 2SO2(g) + O2(g) → 2SO3(g)
Bloom's: 3. Apply
Difficulty: Easy
Subtopic: Types of Chemical Reactions
Subtopic: Writing and Balancing Chemical Equations
Topic: Stoichiometry and Chemical Reactions
62. Write and balance the equation for the combination reaction that occurs when aluminum metal reacts with oxygen gas.
A. 4Al(s) + 3O2(g) → 2Al2O3(s)
B. 2Al(s) + 2O2(g) → 2AlO2(s)
C. 2Al(s) + 2O2(g) → Al2O3(s)
D. Al(s) + O2(g) → AlO(s)
E. Al(s) + O2(g) → AlO2(s)
Bloom's: 3. Apply
Difficulty: Easy
Subtopic: Types of Chemical Reactions
Subtopic: Writing and Balancing Chemical Equations
Topic: Stoichiometry and Chemical Reactions
63. When zinc metal is placed into a copper(II) nitrate solution, a single-displacement reaction occurs. Write a balanced equation to describe this reaction.
A. 2Zn(s) + Cu(NO3)2(aq) → 2Zn(NO3)2(aq) + Cu(s)
B. Zn(s) + Cu(NO3)2(aq) → ZnNO3(aq) + CuNO3(aq)
C. Zn(s) + Cu2NO3(aq) → ZnNO3(aq) + Cu(aq)
D. Zn(s) + Cu(NO3)2(aq) → Zn(NO3)2(aq) + Cu(s)
E. Zn(s) + Cu2NO3(aq) → ZnNO3(aq) + 2Cu(aq)
Bloom's: 3. Apply
Difficulty: Medium
Subtopic: Types of Chemical Reactions
Subtopic: Writing and Balancing Chemical Equations
Topic: Stoichiometry and Chemical Reactions
64. When copper metal is placed into a silver nitrate solution, a single-displacement reaction occurs, forming a copper(II) compound. Write a balanced equation to describe this reaction.
Subtopic: Writing and Balancing Chemical Equations
Topic:
65. When calcium metal is placed in water, a single-displacement reaction occurs. Write a balanced equation to describe this reaction.
) → 2Ca(OH)2(aq) + H2(g)
E. Ca(s) + 2H2O(l) → Ca(OH)2(aq) + H2(g)
Bloom's: 3. Apply
Difficulty: Medium
Subtopic: Types of Chemical Reactions
Subtopic: Writing and Balancing Chemical Equations
Topic: Stoichiometry and Chemical Reactions
66. Predict which of the following reactions will occur?
A. All three will occur.
B. i only
C. iii only
D. ii only
E. ii and iii
Bloom's: 3. Apply
Difficulty: Hard
Subtopic: Types of Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
67. Which of the metals (Fe, Zn, Mg) will react in an aqueous solution of Al(NO3)3 to produce aluminum metal?
A. Zn
B. Mg
C. Fe
D. None of these
E. All of these
Bloom's: 3. Apply
Difficulty: Easy
Subtopic: Types of Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
68. When potassium metal is placed in water, will a reaction occur? If so, what is the balanced equation for the reaction?
A. Yes. 2K(s) + 2H2O(l) → 2KOH(aq) + H2(g)
B. Yes. 2K(s) + 2H2O(l) → 2KH2O(aq)
C. Yes. 2K(s) + 2H2O(l) → 2KOH(aq) + 2H2(g)
D. No reaction will occur.
E. Yes. 2K(s) + 2H2O(l) → 2K(OH)2(aq) + H2(g)
Bloom's: 3. Apply
Difficulty: Medium
Subtopic: Types of Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
69. When iron metal is placed into a solution of hydrochloric acid, will a reaction occur? If so, what is the balanced equation for the reaction?
A. Yes. Fe(s) + 2HCl(aq) → FeCl2(aq) + H2(g)
B. Yes. Fe(s) + 3HCl(aq) → FeCl3(aq) + H2(g)
C. No reaction will occur.
D. Yes. 2Fe(s) + 2HCl(aq) → 2FeCl(aq) + H2(g)
Bloom's: 3. Apply
Difficulty: Medium
Subtopic: Types of Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
70. When copper metal is placed in a solution of zinc nitrate, will a reaction occur? If so, what is the balanced equation for the reaction?
A. Yes. Cu(s) + Zn(NO3)2(aq) → Cu(NO3)2(aq) + Zn(s)
B. Yes. Cu(s) + Zn(NO3)2(aq) → CuNO3(aq) + ZnNO3(aq)
C. No reaction will occur.
D. Yes. Cu(s) + Zn2NO3(aq) → CuNO3(aq) + Zn(aq)
E. Yes. Cu(s) + Zn2NO3(aq) → CuNO3(aq) + 2Zn(aq)
Bloom's: 3. Apply
Difficulty: Medium
Subtopic: Types of Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
71. When copper metal is placed in a solution of platinum(II) chloride, will a reaction occur? If so, what is the balanced equation for the reaction?
A. Cu(s) + Pt2Cl(aq) → CuCl(aq) + 2Pt(aq)
B. Yes. Cu(s) + PtCl2(aq) → CuCl(aq) + PtCl(aq)
C. No reaction will occur.
D. Yes. Cu(s) + Pt2Cl(aq) → CuCl(aq) + Pt(aq)
E. Yes. Cu(s) + PtCl2(aq) → CuCl2(aq) + Pt(s)
Bloom's: 3. Apply
Difficulty: Medium
Subtopic: Types of Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
72. When aqueous solutions of sodium chloride and silver nitrate are mixed, a double-displacement reaction occurs. What is the balanced equation for the reaction?
A. NaCl(aq) + AgNO3(aq) → NaNO3(aq) + ClAg(s)
B. NaCl(aq) + AgNO3(aq) → NaNO3(aq) + AgCl(aq)
C. NaCl(aq) + AgNO3(aq) → NaNO3(aq) + AgCl(s)
D. NaCl(aq) + AgNO3(aq) → NaNO3(aq) + 3AgCl(s)
E. NaCl(aq) + AgNO3(aq) → Na(s) + AgNO3Cl(aq)
Bloom's: 3. Apply
Difficulty: Medium
Subtopic: Types of Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
73. When aqueous solutions of potassium chloride and lead(II) nitrate are mixed, a double-displacement reaction occurs. What is the balanced equation for the reaction?
A. KCl(aq) + Pb2NO3(aq) → KNO3(aq) + PbCl(aq)
B. KCl(aq) + Pb(NO3)2(aq) → K(s) + PbNO3Cl(aq)
C. KCl(aq) + Pb2NO3(aq) → KNO3(aq) + 2PbCl(s)
D. 2KCl(aq) + Pb(NO3)2(aq) → KNO3(aq) + ClPb(s)
E. 2KCl(aq) + Pb(NO3)2(aq) → 2KNO3(aq) + PbCl2(s)
Bloom's: 3. Apply
Difficulty: Medium
Subtopic: Types of Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
74. If solutions of potassium carbonate and calcium nitrate are mixed, will a double-displacement reaction occur? If so, what is the balanced equation for the reaction?
A. Yes. K2CO3(aq) + Ca(NO3)2(aq) → KNO3(aq) + CaK(s)
B. No reaction will occur.
C.
Topic:
75. If solutions of potassium chromate and calcium nitrate are mixed, will a double-displacement reaction occur? If so, what is the balanced equation for the reaction? A.
C. No reaction will occur.
D.
E.
Bloom's: 3. Apply
Difficulty: Medium
Subtopic: Types of Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
76. Which of the following ionic compounds would be expected to be insoluble in water?
A. Li2SO4
B. AgI
C. Ca(CH3CO2)2
D. NaCl
E. KOH
Bloom's: 1. Remember
Difficulty: Easy
Subtopic: Types of Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
77. Which of the following ionic compounds would be expected to be insoluble in water?
A. NH4NO3
B. PbI2
C. NaCH3CO2
D. KCl
E. CuSO4
Bloom's: 1. Remember
Difficulty: Easy
Subtopic: Types of Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
78. Which of the following ionic compounds would be expected to be insoluble in water?
A. NaOH
B. KI
C. CaS
D. Ca(NO3)2
E. Na2SO4
Bloom's: 1. Remember
Difficulty: Easy
Subtopic: Types of Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
79. Consider the reaction CaCO
The driving force that causes the reaction to go to completion is:
A. formation of a soluble salt.
B. formation of an element.
C. formation of an insoluble gas.
D. formation of a precipitate.
E. none of these.
Bloom's: 3. Apply
Difficulty: Medium
Subtopic: Types of Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
80. Consider the reaction Ca(OH)2(aq) + 2HCl(
A. formation of water.
B. formation of a soluble salt.
C. formation of a precipitate.
D. formation of an insoluble gas.
E. formation of an element.
Bloom's: 3. Apply
Difficulty: Medium
Subtopic: Types of Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
The driving force that causes the reaction to go to completion is:
81. When aqueous solutions of K2CO3 and CaCl2 are mixed, what is the correct formula for the precipitate that forms?
A. ClCO3(s)
B. KCl(s)
C. K2Cl2(s)
D. CaCO3(s)
E. K2Ca(s)
Bloom's: 2. Understanding
Difficulty: Easy
Subtopic: Types of Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
82. When aqueous solutions of NaOH and MgCl2 are mixed, a precipitate forms. What is the correct formula for the precipitate?
A. Mg(OH)2(s)
B. NaCl(s)
C. NaCl2(s)
D. MgOH(s)
E. MgCl2(s)
Bloom's: 2. Understanding
Difficulty: Medium
Subtopic: Types of Chemical Reactions
Topic: Stoichiometry and Chemical Reactions
83. Complete and balance the equation for the reaction that occurs when HCl(aq) and Mg(OH)2(aq) are mixed. This reaction occurs in your stomach if you take Milk of Magnesia®.
A.
B.
C.
D.
E.
Bloom's: 3. Apply
Difficulty: Medium
Subtopic: Types of Chemical Reactions
Subtopic: Writing and Balancing Chemical Equations
Topic: Stoichiometry and Chemical Reactions
84. Complete and balance the equation for the reaction that occurs when H2SO4(aq) and NaOH(aq) are mixed.
A.
B.
D.
E.
Bloom's: 3. Apply
Difficulty: Medium
Subtopic: Types of Chemical Reactions
Subtopic: Writing and Balancing Chemical Equations
Topic: Stoichiometry and Chemical Reactions
85. Complete and balance the equation for the reaction that occurs when HBr(aq) and KOH(aq) are mixed.
A. 2HBr(aq) + KOH(aq) → Br2(l) + H2O(l)
B. HBr(aq) + KOH(aq) → KBr(aq) + H2O(l)
C. 2HBr(aq) + KOH(aq) → KBr(aq) + H2O(l)
D. HBr(aq) + KOH(aq) → BrOH(aq) + KH(aq)
E. HBr(aq) + KOH(aq) → KBrO(aq) + H2(g)
Bloom's: 3. Apply
Difficulty: Easy
Subtopic: Types of Chemical Reactions
Subtopic: Writing and Balancing Chemical Equations
Topic: Stoichiometry and Chemical Reactions
86. When powdered sulfur burns in air, a purple flame is produced, as well as a toxic, foul-smelling gas. Write a balanced equation for the reaction between sulfur and oxygen gas.
A. S8(s) + O2(g) → SO2(g)
B. S8(s) + 4O2(g) → 8SO2(g)
C. S8(s) + 8O2(g) → 8SO2(g)
D. 2S8(s) + 8O2(g) → 8SO2(g)
Bloom's: 3. Apply
Difficulty: Easy
Subtopic: Types of Chemical Reactions
Subtopic: Writing and Balancing Chemical Equations
Topic: Stoichiometry and Chemical Reactions
87. When acetylene gas, C2H2, burns in air, a combustion reaction occurs. Write a balanced equation to represent this reaction, which occurs when welding torches are used.
88. Sterno, or “canned heat,” contains methanol, CH3OH, and is used for heating containers of food. Write a balanced equation to represent the combustion reaction that occurs when methanol burns in air. A.
B.
Difficulty: Medium
Subtopic: Types of Chemical Reactions
Subtopic: Writing and Balancing Chemical Equations
Topic: Stoichiometry and Chemical Reactions
89. Would an aqueous solution of CH3OH contain ions? If so, indicate the formulas of the ions in the solution.
A. Yes. CH4 +(aq) + O (aq)
B. Yes. CH3 (aq) + OH+(aq)
C. Yes. CH3 +(aq) + OH (aq)
D. Yes. CH42+(aq) + O2 (aq)
E. No, this substance would not form ions in solution.
Bloom's: 2. Understanding
Difficulty: Easy
Subtopic: Writing Equations for Aqueous Ionic Reactions
Topic: Aqueous Solutions
90. Would an aqueous solution of K2SO4 contain ions? If so, indicate the formulas of the ions in the solution.
A. Yes. 2K+(aq) + S2 (aq) + 4O2 (aq)
B. No, this substance would not form ions in solution.
C. Yes. K22+(aq) + SO42 (aq)
D. Yes. 2K+(aq) + SO42 (aq)
E. Yes. K2 +(aq) + SO4 (aq)
Bloom's: 2. Understanding
Difficulty: Medium
Subtopic: Writing Equations for Aqueous Ionic Reactions
Topic: Aqueous Solutions
91. Would an aqueous solution of KOH contain ions? If so, indicate the formulas of the ions in the solution.
A. Yes. K+(aq) + O2 (aq) + H+(aq)
B. No, this substance would not form ions in solution.
C. Yes. K+(aq) + H2O(l)
D. Yes. K+(aq) + OH (aq)
E. Yes. K (aq) + OH+(aq)
Bloom's: 2. Understanding
Difficulty: Medium
Subtopic: Writing Equations for Aqueous Ionic Reactions
Topic: Aqueous Solutions
92. When writing a net ionic equation, how would Mg(NO3)2(aq) be represented?
A. Mg2+(aq) + (NO3)2 –(aq)
B. Mg2+(aq) + 2NO3 –(aq)
C. Mg(aq) + N2(aq) + 3O2(aq)
D. Mg2+(aq) + 2N3–(aq) + 6O2–(aq)
E. Mg2+(aq) + NO3 –(aq)
Bloom's: 2. Understanding
Difficulty: Medium
Subtopic: Writing Equations for Aqueous Ionic Reactions
Topic: Aqueous Solutions
93. Write and balance a net ionic equation for the reaction between hydrochloric acid and potassium hydroxide.
A. H+(aq) + OH (aq) → H2O(l)
B. H+(aq) + O2 (aq) → OH (aq)
C. HCl(aq) + KOH(aq) → KCl(aq) + H2O(l)
D. Cl (aq) + OH+(aq) → OHCl(aq)
E. K+(aq) + Cl (aq) → KCl(aq)
Bloom's: 3. Apply
Difficulty: Medium
Subtopic: Writing Equations for Aqueous Ionic Reactions
Topic: Aqueous Solutions
94. Write and balance a net ionic equation for the reaction between iron(II) chloride and potassium hydroxide to form iron(II) hydroxide and potassium chloride.
A. Fe2Cl(aq) + OH (aq) → FeOH(s) + Cl (aq)
B. Fe2+(aq) + 2OH (aq) → Fe(OH)2(s)
C. 2Cl (aq) + 2K+(aq) → 2KCl(s)
D. 2Cl (aq) + 2K+(aq) → 2K(s) + Cl2(g)
E. Fe2+(aq) + OH (aq) → FeOH(s)
Bloom's: 3. Apply
Difficulty: Medium
Subtopic: Writing Equations for Aqueous Ionic Reactions
Topic: Aqueous Solutions
95. Write and balance a net ionic equation for the reaction between copper(II) chloride and zinc metal to form copper metal and zinc chloride.
A. Cu2Cl(aq) + Zn(s) → 2Cu(s) + Zn+(aq) + Cl (aq)
B. Cu2+(aq) + 2Cl (aq) + Zn(s) → Cu(s) + Zn2+(aq) + 2Cl (aq)
C. Cu2+(aq) + Zn(s) → Cu(s) + Zn2+(aq)
D. 2Cu+(aq) + Zn(s) → 2Cu(s) + Zn2+(aq)
E. CuCl+(aq) + Zn(s) → Cu(s) + Zn2+(aq) + Cl (aq)
Bloom's: 3. Apply
Difficulty: Medium
Subtopic: Writing Equations for Aqueous Ionic Reactions
Topic: Aqueous Solutions
96. Identify the spectatorion(s) in the
D.
E. There are no spectatorions.
Bloom's: 2. Understanding
Difficulty: Medium
Subtopic: Writing Equations for Aqueous Ionic Reactions
Topic: Aqueous Solutions
97. Identify the spectatorions in the following reaction:
A. NO3 –(aq)only
B. There are no spectatorions.
C. Zn2+(aq) and NO3 –(aq)
D. Zn2+(aq) only
E. H+(aq) and NO3 –(aq)
Bloom's: 2. Understanding
Difficulty: Medium
Subtopic: Writing Equations for Aqueous Ionic Reactions
Topic: Aqueous Solutions
98. Identify the spectatorions in the following reaction:
A. There are no spectatorions.