9/17/2020
Assignment Print View
CHAPTER 1
1.
Award: 10.00 points
The quantity 0.0000064 g expressed in scientific notation.
6.4 × 106 g 6.4 × 10−6 g 6.4 × 107 g 6.4 × 10−7 g Negative powers of ten move the decimal to the left.
2.
Award: 10.00 points
The quantity 8.7 × 105 g expressed in standard decimal notation.
0.000087 g 870.000 g 0.0000087 g 870,000 g Positive powers of ten move the decimal to the right.
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3.
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A substance that can be broken down into two or more simpler substances by chemical methods is called a(n)
compound. mixture. element. isotope. Mixtures are separable by physical means.
4.
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On a periodic table, the columns of elements with similar properties are
periods. groups. rows. metals. Periods and rows go across.
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5.
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The most numerous of the elements are the
metals. nonmetals. metalloids. noble gases. These are green in the periodic table in your textbook.
6.
Award: 10.00 points
Which is not a mixture?
A jar filled with rocks and sand Seawater A glass of Kool-Aid Sodium chloride Mixtures include more than one pure substance.
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7.
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Which is not a pure substance?
Helium Copper wire Air Sucrose Mixtures are not pure substances.
8.
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Which squares contain mixtures?
II and III only III and IV only I, III, and IV only I and IV only Mixtures will have different substances in the same box.
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9.
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Which square(s) contain(s) only an element?
I only II only I and II only III and IV only Elements will only have one type of atom in the box.
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10.
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Which symbols represent only elements that are metals?
X and Z X and Q P and L X, R, P, and Q Nonmetals reside in the upper right corner of the periodic table.
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11.
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Which symbol(s) represent(s) elements in the noble gas family?
X and Z P and L Q Y Noble gases are in the far-right column of the periodic table.
12.
Award: 10.00 points
Which differentiates a compound from a mixture of two or more elements?
The elements in a compound may be present in varying proportions A compound does not exhibit the individual properties of the elements of which it is composed
A compound is made up of only one element A compound cannot be made up of more than two elements Remember that compounds are elements bound together by chemical bonds.
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13.
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Which substance is an element?
NO2 NaCl N2 CH4 Only one has just one symbol in the formula.
14.
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A(n) __________ is a fixed number of atoms held together by chemical bonds in a certain spatial arrangement.
element ion molecule mixture Remember which of these have more than one element that are also bonded together.
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15.
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Which diagram(s) best represent(s) only diatomic molecules?
I only II only I and II only II and IV only The prefix di- means two.
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9/23
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16.
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Which diagram(s) best represent(s) only molecules?
I only II only III only I and II only IV only Molecules have multiple atom bound together.
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10/23
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17.
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Which diagram(s) best represent(s) only individual atoms?
I only II only III only IV only II and III only The atoms are not bound to other atoms.
18.
Award: 10.00 points
Which of the following is the chemical symbol for silver?
Au Pb Ag Fe
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11/23
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19.
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Which of the following is a pure substance?
Lemonade Concrete Gasoline Silver wire Remember that pure substances have only one component.
20.
Award: 10.00 points
Which square(s) contain(s) only one or more compounds?
I only II only I and IV only II and III only Different compounds will have different combinations of different elements.
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12/23
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21.
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In the periodic table, which elements typically have similar properties?
Those in the same rows Those related diagonally Those in the same columns Those on opposite sides Groups are those with similar properties.
22.
Award: 10.00 points
The nucleus of an atom contains
electrons and protons only. protons only. electrons, protons, and neutrons. protons and neutrons only. Remember that the massive particles are in the nucleus while the electrons orbit around the outside.
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23.
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What distinguishes the atoms of one element from another?
The number of neutrons The number of protons plus neutrons The number of protons The number of neutrons plus electrons Remember that the number of protons is the atomic number and that defines who the element is.
24.
Award: 10.00 points
The atomic number is the
same as the mass number of an atom. number of protons in a nucleus. number of protons and neutrons in a nucleus. number of neutrons in a nucleus. The protons define the element.
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25.
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The majority of new smartphones being released have displays that are at least 5 inches in size. What is this size in centimeters? (There are 2.54 cm in one inch.)
1.97 cm 6.10 cm 12.7 cm 60.0 cm
26.
Award: 10.00 points
One common class of minerals are aluminosilicates, with a general formula of Al2SiO5. What is the atomic percentage composition of aluminum in an aluminosilicate?
12.5 percent Al 25 percent Al 33.3 percent Al 62.5 percent Al
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15/23
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27.
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Which one of the following is a subatomic particle located in the center of the atom and has a positive charge?
Protons Neutrons Electrons Photons
28.
Award: 10.00 points
Which one of these materials is most likely to conduct heat?
A titanium rod A sample of chlorine gas A silicon wafer A chunk of phosphorus
29.
Award: 10.00 points
What type of material is defined as having a well-ordered atomic structure?
Amorphous Crystalline Transparent Opaque
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30.
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What are the three pillars of sustainability?
Reduce, reuse, recycle Equitability, justice, quality of life Diversity, efficiency, toxicity Environmental, social, economic
31.
Award: 10.00 points
Which country is the world's leading producer of rare earth elements?
USA China South Africa Brazil
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17/23
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32.
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A recent set of advertisements has a picture of an aluminum can with an aluminum-frame bicycle, along with a hypothetical quote from the can that reads: “I want to be a bike. Recycle me.” The analysis of the life cycle of an item starting with its raw materials and ending with the used item becoming the raw material for new products is called
cradle-to-grave. reusability. cradle-to-cradle. cost-benefit analysis.
33.
Award: 10.00 points
Which one of the following is an example of a homogeneous mixture?
A chocolate chip cookie A glass of pulp-free lemonade A carbonated beverage A bowl of cereal in milk
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18/23
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34.
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What is the density of a block of material that is 12 cm × 6 cm × 2 cm and has a mass of 356 g?
1.00 g/cm3 2.47 g/cm3 3.56 g/cm3 4.95 g/cm3
35.
Award: 10.00 points
How many cm are in 0.129 m?
1.29 cm 12.9 cm 129 cm 1290 cm
36.
Award: 10.00 points
What term is defined as the flow of electrons from one location to another?
Resistance Transparency Density Electricity
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19/23
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37.
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A sample of silicon rejected for use in an electronic circuit has an impurity of boron at a level of 3 parts per billion. What is the fraction of boron atoms in the silicon sample as written in scientific notation?
3 × 10−9 3 × 109 3 × 10−12 3 × 10−6
38.
Award: 10.00 points
What is the term used to describe a material that allows light to mostly pass through it?
Reflective Porous Transparent Absorbtive
39.
Award: 10.00 points
How many protons are in an atom of carbon?
2 4 6 12 https://ezto.mheducation.com/hm.tpx
20/23
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40.
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Which of the following states of matter has a definite shape?
Solid Liquid Gas Plasma
41.
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Matter is anything that occupies space and has a __________.
density volume mass color
42.
Award: 10.00 points
In which of the following phases are the particles farthest from each other?
Solid Liquid Gas Need more information
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43.
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Different elemental forms of carbon such as diamond and graphite are referred to as __________.
isotopes allotropes isomers isotropes
44.
Award: 10.00 points
What multistep process is used to separate pure metals from ore?
Mining Leaching Metallurgy Grinding
45.
Award: 10.00 points
Which of the following is a physical change?
Melting of ice Burning of gasoline Baking a cake Fermenting of grapes
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