Chemical Reactions
Practice Test
1.
What type of reaction occurs when potassium and chlorine gas produce potassium chloride?
Predicting Products of Chemical Reactions
Class of reaction
Reactants
Probable products
Synthesis
Two or more substances
One compound
Combustion
A metal and oxygen
A nonmetal and oxygen
A compound and oxygen
The oxide of the metal
The oxide of the nonmetal
Two or more oxides
Decomposition
One compound
Two or more elements and/or compounds
Single-replacement
A metal and a compound
A nonmetal and acompound
new compound and the replaced metal
A new compound and the replaced nonmetal
Double-replacement
Two compounds
Two different compounds,
one of which is often a solid, water, or a gas
a.
synthesis
b.
replacement
c.
combustion
d.
decomposition
2.
The chemical equation 2H
2
+ O
2
→ 2H
2
O represents a __________.
a.
single-replacement reaction
b.
synthesis reaction
c.
double-replacement reaction
d.
decomposition reaction
3.
What is the correct word equation for the chemical equation 2Fe(s) + 3Cl
2
(g) → 2FeCl
3
(s)?
a.
Solid iron and chlorine gas react to produce solid iron chloride.
b.
Aqueous iron and chlorine gas react to produce aqueous iron chlorate.
c.
Aqueous iron and chlorine gas react to produce solid iron chlorate.
d.
Solid iron and chlorine gas react to produce solid iron chlorate.
4.
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.
5.
In the combustion reaction of propane, C
3
H
8
, what are the products?
a.
H
2
O and CO
2
b.
O
2
and H
2
O
c.
C
3
H
8
and O
2
d.
C
3
H
8
and CO
2
6.
Will the double displacement reaction NaOH + CaBr
2
occur? If so, what is the product of the reaction?
a.
Yes, CaNa
b.
Yes, Br(OH)
2
c.
Yes, Ca(OH)
2
d.
No
7.
Which of the following components will always be produced during a chemical reaction between an acid and a base?
a.
a base
b.
an acid
c.
a gas
d.
water
8.
The _________ symbol separates the reactants from the products and means "to yield".
a.
(s)
b.
→
c.
+
d.
(g)
9.
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 CO
2
d.
C
7
H
16
and H
2
O
10.
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.
HNO
3
(aq)
c.
AgNO
3
(aq)
d.
AgCl(s)
11.
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.
reacting molecule
b.
participating ion
c.
reacting compound
d.
spectator ion
12.
Which of the following single-replacement reactions will occur?
a.
Cl
2
(g) + HBr(aq) →
b.
Au(s) + Cu(NO
3
)
2
(aq) →
c.
Br
2
(g) + HF(aq) →
d.
Cu(s) + ZnCl
2
(aq) →
13.
In a chemical equation, the number written in front of the chemical formula is the _________.
a.
product
b.
reactant
c.
coefficient
d.
equation
14.
What is the complete ionic equation for the following chemical equation?
Cl
2
(aq) + Na
2
SO
4
(aq) → BaSO
4
(s) + 2NaCl(aq)
a.
Ba
2+
(aq) + 2Cl
-
(aq) + 2Na
+
(aq) + SO
4
2-
(aq) → 2Na
+
(aq) + 2Cl
-
(aq) + BaSO
4
(s)
b.
Ba
2+
(aq) + SO
4
2-
(aq) → BaSO
4
(s)
c.
Ba
2+
(aq) + Cl
-
(aq) + Na+(aq) + SO
4
2-
(aq) → Na+(aq) + Cl
-
(aq) + BaSO
4
(s)
d.
BaCl
2
(aq) + 2Na
+
(aq) + SO4
2-
(aq) → 2Na
+
(aq) + 2Cl
-
(aq) + BaSO
4
(s)
15.
In the reaction below, which of the components will precipitate?
NaCl(aq) + KBr(aq) → KCl(aq) + NaBr(aq)
a.
KBr(aq)
b.
KCl(aq)
c.
none of the components precipitate
d.
NaBr(aq)
