Chapter 10:
Chemical Reactions
Practice Test
1.
The major physical indicator of a combustion reaction is _______.
a.
a color change in solution
b.
Cold
c.
the formation of a precipitate
d.
Heat
Hint
2.
In the reaction below, which of the components will precipitate?
NaCl(aq) + KBr(aq) → KCl(aq) + NaBr(aq)
a.
none of the components precipitate
b.
KCl(aq)
c.
NaBr(aq)
d.
KBr(aq)
Hint
3.
The _________ symbol separates the reactants from the products and means “to yield”.
a.
+
b.
(s)
c.
(g)
d.
→
Hint
4.
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.
7
b.
5
c.
4
d.
6
Hint
5.
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.
16
b.
12
c.
10
d.
14
Hint
6.
In the combustion reaction of propane, C
3
H
8
, what are the products?
a.
C
3
H
8
and O
2
b.
O
2
and H
2
O
c.
H
2
O and CO
2
d.
C
3
H
8
and CO
2
Hint
7.
When there are exactly the same number and type of atoms on both sides of a chemical equation, the equation is ____________.
a.
balanced
b.
ionic
c.
decomposed
d.
synthetic
Hint
8.
Na
+
(aq) is a ___________ in the following complete ionic equation.
H
+
(aq) + Cl
-
(aq) + Na
+
(aq) + OH
-
(aq) → Na
+
(aq) + Cl
-
(aq) + H
2
O(l)
a.
spectator ion
b.
participating ion
c.
reacting molecule
d.
reacting compound
Hint
9.
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.
1
b.
2
c.
4
d.
3
Hint
10.
When Ca(OH)
2
reacts with H
2
SO
4
, ________________ are produced.
a.
CaO and H
2
SO
4
b.
CaH
2
and H
2
SO
6
c.
Ca(OH)
2
and H
2
SO
4
d.
CaSO
4
and H
2
O
Hint
11.
In the chemical equation below, which of the components is a precipitate?
HCl(aq) + AgNO
3
(aq) → AgCl(s) + HNO
3
(aq)
a.
HCl(aq)
b.
AgNO
3
(aq)
c.
HNO
3
(aq)
d.
AgCl(s)
Hint
12.
Which of the following components will always be produced during a chemical reaction between an acid and a base?
a.
an acid
b.
a gas
c.
water
d.
a base
Hint
13.
In a chemical equation, the number written in front of the chemical formula is the _________.
a.
reactant
b.
product
c.
coefficient
d.
equation
Hint
14.
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.
4
c.
1
d.
2
Hint
15.
Consider the following balanced equation. Which one of the following statements is false?
2H
2
+ O
2
→ H
2
O
a.
One molecule of O
2
will produce 2 molecules of H
2
O.
b.
Two molecules of H
2
will produce two molecules of H
2
O.
c.
Two molecules of H
2
will produce one molecule of H
2
O.
d.
One molecule of O
2
will react with 2 molecules of H
2
.
Hint
16.
Which of the following observations could be an indication of a chemical reaction of antimony?
a.
It melts at 631°C.
b.
It is a solid at room temperature.
c.
It burns in an atmosphere of chlorine.
d.
It expands upon freezing.
Hint
17.
The chemical equation 2H
2
+ O
2
→ H
2
O represents a __________.
a.
decomposition reaction
b.
synthesis reaction
c.
single-replacement reaction
d.
double-replacement reaction
Hint
18.
The components of a chemical equation that are left after the spectator ions are removed are the ____________.
a.
spectator ions
b.
reactants
c.
participating ions
d.
products
Hint
19.
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.
C
7
H
16
and O
2
c.
C
7
H
16
and H
2
O
d.
CO
2
and H
2
O
Hint
20.
Balance the following equation. What is the coefficient for hydrogen fluoride?
SiO
2
+ HF → SiF
4
+ H
2
O
a.
4
b.
1
c.
2
d.
3
Hint
