Solutions
Practice Test
1.
Which molecule will not undergo hydrogen bonding?
a.
CH
4
b.
HF
c.
NH
3
d.
H
2
O
2.
Which of the following is a covalent network solid?
a.
ice
b.
table sugar
c.
table salt
d.
quartz
3.
Which of the following phase changes will release energy during the transition?
a.
condensation
b.
vaporization
c.
sublimation
d.
melting
4.
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.
KBr(aq)
c.
KCl(aq)
d.
NaBr(aq)
5.
A 4.305-g sample of a nonelectrolyte is dissolved in 105 g of water. The solution freezes at -1.23°C. Calculate the molar mass of the solute. K
f
for water = 1.86°C/
m
.
a.
58.4 g/mol
b.
46.2 g/mol
c.
62.0 g/mol
d.
39.7 g/mol
6.
Calculate the molarity of 0.75 L of a solution containing 0.83 g of dissolved KCl.
a.
0.75 M
b.
0.015 M
c.
1.1 M
d.
6.2
7.
What is the name for a substance that dissolves in water but does not form ions or conduct an electric current?
a.
saturated
b.
insoluble
c.
electrolyte
d.
nonelectrolyte
8.
Which one of the following is an example of an emulsion?
a.
styrofoam
b.
fog
c.
shaving cream
d.
mayonnaise
9.
According to the phase diagram for CO
2
, what is the critical point for carbon dioxide?
a.
31
b.
-100
c.
-45
d.
-78
10.
What is a common means of identifying a supersaturated solution?
a.
solvation
b.
dissolution
c.
precipitation
d.
hydration
11.
The chemical equation 2H
2
+ O
2
→ 2H
2
O represents a __________.
a.
single-replacement reaction
b.
double-replacement reaction
c.
synthesis reaction
d.
decomposition reaction
12.
Which of the following is the general definition of a liquid?
a.
Matter that has a fixed volume but no fixed shape.
b.
Matter that has a fixed volume and a fixed shape.
c.
Matter that has neither a fixed volume nor a fixed shape.
d.
Matter that has a fixed shape but no fixed volume.
13.
Consider the following balanced equation. Which one of the following statements is false?
a.
One molecule of O
2
will produce 2 molecules of H
2
O.
b.
One molecule of O
2
will react with 2 molecules of H
2
.
c.
Two molecules of H
2
will produce one molecule of H
2
O.
d.
Two molecules of H
2
will produce two molecules of H
2
O.
14.
The Tyndall effect describes ______________.
a.
precipitation of colloidal particles using electrically charged plates
b.
hydrophobic interactions between nonpolar molecules
c.
the adsorption of positive ions onto the surface of a hydrophilic solid
d.
the scattering of light by colloidal particles
15.
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.
HCl(aq)
c.
AgNO
3
(aq)
d.
AgCl(s)
16.
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.
decomposition
d.
combustion
17.
In a solution, the substance that does the dissolving is ____________.
a.
saturated
b.
the solute
c.
miscible
d.
the solvent
18.
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.
CO
2
and H
2
O
d.
C
7
H
16
and H
2
O
19.
What is the mole fraction of ethanol (C
2
H
5
OH) in a solution of 47.5 g of ethanol in 850 g of water?
a.
0.021
b.
0.032
c.
0.18
d.
0.98
20.
In a polar molecule, which atom will have the greatest partial negative charge?
a.
the largest atom
b.
the most electronegative atom
c.
the smallest atom
d.
the least electronegative atom
