Oxidation-Reduction Reactions
Practice Test
1.
This substance is usually the top industrial chemical produced in the United States.
a.
ammonia
b.
sulfuric acid
c.
sodium hydroxide
d.
chlorine
2.
___________________ allow you to determine the approximate pH of a solution.
a.
Beakers
b.
Acid-base indicators
c.
Anhydrides
d.
Equations
3.
How many moles of magnesium atoms is 7.32 × 10
26
atoms?
a.
6.02 × 10
3
mol
b.
8.23 × 10
26
mol
c.
4.44 × 10
1
mol
d.
1.22 × 10
3
mol
4.
Large deposits of solid, elemental __________ are formed in redox reactions near the vents of some volcanoes.
a.
chlorine
b.
oxygen
c.
hydrogen
d.
sulfur
5.
Driven by concentration difference, the movement of molecules through a semipermeable memebrane is called ___________.
a.
boiling
b.
osmosis
c.
reverse movement
d.
capillarity
6.
H
2
O is sometimes called ________________.
a.
a poor solvent
b.
a specific solute
c.
a solution
d.
the universal solvent
7.
The pH scale is used to express the concentrations of hydronium ions and _____________ ions in aqueous solutions.
a.
hydroxide
b.
potassium
c.
carbon
d.
fluoride
8.
How does paint protect steel surfaces from corrosion?
a.
Paint corrodes leaving steel intact.
b.
Paint acts as a sacrificial anode.
c.
Paint prevents the oxidation-reduction reaction of corrosion from occurring.
d.
Paint galvanizes steel.
9.
What is the oxidation number of iron in Fe
2
O
3
?
a.
3+
b.
2-
c.
2+
d.
1+
10.
22.5 mL of 0.122 M HCl neutralizes 30.0 mL of a KOH solution. What is the molarity of the KOH solution?
a.
0.00445 M
b.
0.0915 M
c.
1.08 M
d.
0.163 M
11.
What is the base in the reaction HI + H
2
O
H
3
O + I
-
?
a.
HI
b.
H
2
O
c.
Isub>2
d.
H
3
O
+
12.
What will be the acid-base condition of the solution when ammonium citrate is dissolved in water?
a.
acidic
b.
basic
c.
The acid-base condition cannot be determined.
d.
neutral
13.
Determine the net change in oxidation number of chlorine in the following reaction: ClO4- (aq) + Br- (aq) ® Cl- (aq) + Br2(g) (in acid solution)
a.
8
b.
-8
c.
-7
d.
7
14.
Calculate the mass in grams of 0.0790 moles of aluminum.
a.
1.0 g
b.
21 g
c.
34 g
d.
2.1 g
15.
How many moles of calcium are in 0.544 g of calcium?
a.
0.0773
b.
0.554
c.
3.11
d.
0.0136
16.
Capillarity accounts for the rising of liquids in ___________________.
a.
narrow tubes
b.
rivers
c.
soda bottles
d.
oceans
17.
According to the equation 2HBr + Na
2
CO
3
NaBr + H
2
O + CO
2
, what volume of CO
2
at 1.230 atm and 325 K is produced by 50.0 g of HBr reacting with an excess of Na
2
CO
3
?
a.
1.52 L
b.
22.4 L
c.
50.0 L
d.
6.70 L
18.
What is the formula for perchloric acid?
a.
HClO
3
b.
HClO
4
c.
HCl
d.
HClO
2
19.
Which of these combinations will NOT make an acid-base buffer?
a.
HCN/KCN
b.
NH
3
/NH
4
NO
3
c.
HC
2
H
3
O
2
/NaC
2
H
3
O
2
d.
NaOH/NaCl
20.
A ________________ solution contains more than the usual maximum amount of solute.
a.
concentrated
b.
dilute
c.
supersaturated
d.
saturated
