Chapter 10:
Chemical Reactions
Practice Test
1.
The components of a chemical equation that are left after the spectator ions are removed are the ____________.
a.
reactants
b.
participating ions
c.
products
d.
spectator ions
Hint
2.
Consider the following balanced equation. Which one of the following statements is false?
2H
2
+ O
2
→ H
2
O
a.
Two molecules of H
2
will produce one molecule of H
2
O.
b.
Two molecules of H
2
will produce two molecules of H
2
O.
c.
One molecule of O
2
will produce 2 molecules of H
2
O.
d.
One molecule of O
2
will react with 2 molecules of H
2
.
Hint
3.
In the chemical equation below, which of the components is a precipitate?
HCl(aq) + AgNO
3
(aq) → AgCl(s) + HNO
3
(aq)
a.
HNO
3
(aq)
b.
AgNO
3
(aq)
c.
AgCl(s)
d.
HCl(aq)
Hint
4.
The following chemical equation is classified as a ______________.
CaCO
3
→ CaO + CO
2
a.
decomposition reaction
b.
synthesis reaction
c.
double-replacement reaction
d.
single-replacement reaction
Hint
5.
Balance the following equation with the smallest whole-number coefficients. How many molecules of hydrogen will be produced if three molecules of sulfuric acid are consumed in the reaction?
Cr + H
2
SO
4
→ Cr
2
(SO
4
)
3
+ H
2
a.
2
b.
4
c.
1
d.
3
Hint
6.
In the following unbalanced chemical reaction, which components are classified as the reactants?
C
7
H
16
+O
2
CO
2
+ H
2
O
a.
C
7
H
16
and CO
2
b.
CO
2
and H
2
O
c.
C
7
H
16
and O
2
d.
C
7
H
16
and H
2
O
Hint
7.
In a chemical equation, the number written in front of the chemical formula is the _________.
a.
product
b.
coefficient
c.
reactant
d.
equation
Hint
8.
In the combustion reaction of propane, C
3
H
8
, what are the products?
a.
H
2
O and CO
2
b.
C
3
H
8
and CO
2
c.
O
2
and H
2
O
d.
C
3
H
8
and O
2
Hint
9.
Balance the following equation with the smallest whole-number coefficients. How many molecules of SO
2
will be produced if 2 molecules of S
8
are consumed?
S
8
+ O
2
→ SO
2
a.
14
b.
12
c.
16
d.
10
Hint
10.
Balance the following equation. What is the coefficient for hydrogen fluoride?
SiO
2
+ HF → SiF
4
+ H
2
O
a.
1
b.
4
c.
3
d.
2
Hint
11.
In the reaction below, which of the components will precipitate?
NaCl(aq) + KBr(aq) → KCl(aq) + NaBr(aq)
a.
KCl(aq)
b.
none of the components precipitate
c.
KBr(aq)
d.
NaBr(aq)
Hint
12.
The major physical indicator of a combustion reaction is _______.
a.
the formation of a precipitate
b.
Cold
c.
Heat
d.
a color change in solution
Hint
13.
The _________ symbol separates the reactants from the products and means “to yield”.
a.
(g)
b.
(s)
c.
→
d.
+
Hint
14.
The chemical equation Zn + 2HCl → H
2
+ ZnCl
2
represents a _________.
a.
single-replacement reaction
b.
synthesis reaction
c.
double-replacement reaction
d.
decomposition reaction
Hint
15.
When there are exactly the same number and type of atoms on both sides of a chemical equation, the equation is ____________.
a.
balanced
b.
synthetic
c.
decomposed
d.
ionic
Hint
16.
Balance the following equation with the smallest whole-number coefficients. What is the coefficient for Ag?
Ag + H
2
S + O
2
→ Ag
2
S + H
2
O
a.
2
b.
4
c.
1
d.
3
Hint
17.
A balanced chemical equation is a direct presentation of the ___________.
a.
law of conservation of energy
b.
ideal gas law
c.
law of conservation of mass
d.
law of conservation of momentum
Hint
18.
What is the complete ionic equation for the following chemical equation?
BaCl
2
(aq) + Na
2
SO
4
(aq) → BaSO
4
(s) + 2NaCl(aq)
a.
Ba
2
+(aq) + Cl
-
(aq) + Na
+
(aq) + SO
4
2
2-
(aq) → Na
+
(aq) + Cl
-
(aq) + BaSO
4
(s)
b.
Ba
2+
(aq) + 2Cl
-
(aq) + 2Na
+
(aq) + SO
4
2-
(aq) → 2Na
+
(aq) + 2Cl
-
(aq) + BaSO
4
(s)
c.
Ba
2+
(aq) + SO
4
2-
(aq) → BaSO
4
(s)
d.
BaCl
2
(aq) + 2Na
+
(aq) + SO
4
2-
(aq) → 2Na
+
(aq) + 2Cl
-
(aq) + BaSO
4
(s)
Hint
19.
Which of the following components will always be produced during a chemical reaction between an acid and a base?
a.
water
b.
a base
c.
a gas
d.
an acid
Hint
20.
The chemical equation 2H
2
+ O
2
→ H
2
O represents a __________.
a.
double-replacement reaction
b.
single-replacement reaction
c.
synthesis reaction
d.
decomposition reaction
Hint
