Chapter 7: Chemical Reactions Review Sheet
1) In a chemical reaction
reactants
Name:
undergo a change to become
products
2) A representation of a reaction in formulas is called a
chemical
equation
3) In the law of conservation of massthe massof
reactants
must be equal to the massof
products
in a reaction.
4) To make the atoms of reactants equal to the atoms of products in an equation, you must
balance
a reaction. 5) Balance these equations: a)
4 Fe +
3 O2
b)
WO3
c)
2 PbS
d)
Na2SO4
e)
SiO2
f)
Al(OH)3
g)
2 Cr2O3
h)
CaCO3
→
2 Fe2O3
3 H2 →
+
W
3 O2 →
+
+
2
+
KCl →
+ →
3 HCl
+
→
+
single replacement
2 SO2
2 NaCl +
SiC
3 Si →
CaO
+ 3 H2O
2 PbO +
2 C →
+
synthesis
AlCl3
4 Cr +
K2SO4
double replacement
2 CO
+
3 H2O
3 SiO2
CO2 balanced
double replacement
single replacement
decomposition
6) Classify the reactions above by writing the reaction type on the line provided. (No line = no type) 7) What type of reaction only produces one product?
synthesis
8) What type of reaction has only one reactant?
decomposition
9) What type of reaction has a single element reacting with a compound and replacing an element in that compound ? single replacement