Chemical Reactions
Practice Test
1.
Which of the following single-replacement reactions will occur?
a.
Br
2
g
+ HF
aq
→
b.
Au
s
+ Cu
NO
3
2
aq
→
c.
Cl
2
g
+ HBr
aq
→
d.
Cu
s
+ ZnCl
2
aq
→
2.
Balance the following equation. What is the coefficient for hydrogen fluoride?
SiO
2
+HF →SiF
4
+H
2
O
SC.B.1.4.2
a.
2
b.
3
c.
4
d.
1
3.
The chemical equation Zn+2HCl→H
2
+ZnCl
2
represents a _________.
a.
synthesis reaction
b.
decomposition reaction
c.
single-replacement reaction
d.
double-replacement reaction
4.
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.
participating ion
b.
reacting compound
c.
reacting molecule
d.
spectator ion
5.
The components of a chemical equation that are left after the spectator ions are removed are the ____________.
a.
reactants
b.
products
c.
participating ions
d.
spectator ions
6.
Will the double displacement reaction NaOH + CaBr
2
occur? If so, what is the product of the reaction?
SC.B.1.4.2
a.
Yes, Br
OH
2
b.
Yes, CaNa
c.
No
d.
Yes, Ca
OH
2
7.
In a chemical equation, the number written in front of the chemical formula is the _________.
a.
coefficient
b.
product
c.
reactant
d.
equation
8.
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 H
2
O
b.
CO
2
and H
2
O
c.
C
7
H
16
and CO
2
d.
C
7
H
16
and O
2
9.
Which of these is a spectator ion in the reaction 2NaOH
aq
+ CuC
l2
→ 2NaCl
aq
+ Cu
OH
2
s
?
a.
Na
b.
OH
c.
Cu
d.
Cl and Na
10.
Which of the following observations could be an indication of a chemical reaction of antimony?
SC.A.1.4.3
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.
11.
A balanced chemical equation is a direct presentation of the ___________.
SC.B.1.4.2
a.
law of conservation of mass
b.
law of conservation of momentum
c.
law of conservation of energy
d.
ideal gas law
12.
In the chemical equation below, which of the components is a precipitate?
HCl
aq
+ AgNO
3
aq
→ AgCl
s
+ HNO
3
aq
SC.A.1.4.5
a.
AgNO
3
aq
b.
HNO
3
aq
c.
HCl
aq
d.
AgCl
s
13.
In the combustion reaction of propane, C
3
H
8
, what are the products?
SC.B.1.4.2
a.
C
3
H
8
and CO
2
b.
O
2
and H
2
O
c.
C
3
H
8
and O
2
d.
H
2
O and CO
2
14.
The major physical indicator of a combustion reaction is _______.
a.
a color change in solution
b.
heat
c.
cold
d.
the formation of a precipitate
15.
Which of the following components will always be produced during a chemical reaction between an acid and a base?
SC.B.1.4.2
a.
a base
b.
water
c.
an acid
d.
a gas
