Chapter 10:
Chemical Reactions
Practice Test
1.
Balance the following equation with the smallest whole-number coefficients. What is the coefficient for HCl?
SiCl
4
+ H
2
O → H
4
SiO
4
+ HCl
a.
4
b.
7
c.
6
d.
5
Hint
2.
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.
3
b.
2
c.
1
d.
4
Hint
3.
When Ca(OH)
2
reacts with H
2
SO
4
, ________________ are produced.
a.
CaSO
4
and H
2
O
b.
Ca(OH)
2
and H
2
SO
4
c.
CaH
2
and H
2
SO
6
d.
CaO and H
2
SO
4
Hint
4.
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.
CO
2
and H
2
O
b.
C
7
H
16
and O
2
c.
C
7
H
16
and H
2
O
d.
C
7
H
16
and CO
2
Hint
5.
In the reaction below, which of the components will precipitate?
NaCl(aq) + KBr(aq) → KCl(aq) + NaBr(aq)
a.
KCl(aq)
b.
KBr(aq)
c.
NaBr(aq)
d.
none of the components precipitate
Hint
6.
The chemical equation 2H
2
+ O
2
→ H
2
O represents a __________.
a.
decomposition reaction
b.
single-replacement reaction
c.
double-replacement reaction
d.
synthesis reaction
Hint
7.
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.
BaCl
2
(aq) + 2Na
+
(aq) + SO
4
2-
(aq) → 2Na
+
(aq) + 2Cl
-
(aq) + BaSO
4
(s)
b.
Ba
2
+(aq) + Cl
-
(aq) + Na
+
(aq) + SO
4
2
2-
(aq) → Na
+
(aq) + Cl
-
(aq) + BaSO
4
(s)
c.
Ba
2+
(aq) + SO
4
2-
(aq) → BaSO
4
(s)
d.
Ba
2+
(aq) + 2Cl
-
(aq) + 2Na
+
(aq) + SO
4
2-
(aq) → 2Na
+
(aq) + 2Cl
-
(aq) + BaSO
4
(s)
Hint
8.
Which of the following observations could be an indication of a chemical reaction of antimony?
a.
It melts at 631°C.
b.
It expands upon freezing.
c.
It burns in an atmosphere of chlorine.
d.
It is a solid at room temperature.
Hint
9.
The major physical indicator of a combustion reaction is _______.
a.
the formation of a precipitate
b.
Heat
c.
Cold
d.
a color change in solution
Hint
10.
Balance the following equation. What is the coefficient for hydrogen fluoride?
SiO
2
+ HF → SiF
4
+ H
2
O
a.
2
b.
1
c.
4
d.
3
Hint
11.
What are the products of the reaction between barium hydroxide and hydrochloric acid?
a.
barium chloride and barium hydride
b.
barium hydroxide and water
c.
barium chloride and water
d.
chloric acid and barium
Hint
12.
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.
12
b.
14
c.
16
d.
10
Hint
13.
The following chemical equation is classified as a ______________.
CaCO
3
→ CaO + CO
2
a.
single-replacement reaction
b.
decomposition reaction
c.
double-replacement reaction
d.
synthesis reaction
Hint
14.
Which of the following components will always be produced during a chemical reaction between an acid and a base?
a.
an acid
b.
a base
c.
a gas
d.
water
Hint
15.
The chemical equation Zn + 2HCl → H
2
+ ZnCl
2
represents a _________.
a.
single-replacement reaction
b.
double-replacement reaction
c.
decomposition reaction
d.
synthesis reaction
Hint
16.
In the chemical equation below, which of the components is a precipitate?
HCl(aq) + AgNO
3
(aq) → AgCl(s) + HNO
3
(aq)
a.
AgNO
3
(aq)
b.
AgCl(s)
c.
HCl(aq)
d.
HNO
3
(aq)
Hint
17.
The components of a chemical equation that are left after the spectator ions are removed are the ____________.
a.
spectator ions
b.
participating ions
c.
reactants
d.
products
Hint
18.
A balanced chemical equation is a direct presentation of the ___________.
a.
law of conservation of momentum
b.
law of conservation of mass
c.
law of conservation of energy
d.
ideal gas law
Hint
19.
In a chemical equation, the number written in front of the chemical formula is the _________.
a.
reactant
b.
equation
c.
coefficient
d.
product
Hint
20.
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.
C
3
H
8
and O
2
d.
O
2
and H
2
O
Hint
