N
A
= 6.022x10
23
1.
Oxygen has an atomic number of 8 and its isotopes
16
O,
17
O, and
18
O all have
A.
8 neutrons.
B.
8 protons and 10 neutrons.
C.
8 neutrons and 8 electrons.
D.
8 protons and 8 neutrons.
E.
8 protons and 8 electrons.
2.
Which of the following is likely to form an anion?
A.
P
B.
Ba
C.
V
D.
Rb
E.
Zn
3.
Which of the following is a pure substance?
A.
salt
B.
bourbon whiskey
C.
tea
D.
wine
E.
brass
4.
Which of the following is a chemical property of methane (natural gas)?
A.
Methane melts at 89 K.
B.
Methane-air mixtures burn.
C.
Liquid methane is a poor conductor of electricity.
D.
Solid methane has a density of 0.415 g/mL.
E.
Methane is a colorless, odorless gas at room temperature.
5.
A green aqueous solution was labeled "nickel(II) chloride". This solution contains the ions
A.
Ni
2+
and Cl
–
.
B.
NiO
2+
and Cl
–
.
C.
Ni
2
O
2+
and Cl
–
.
D.
2Ni
+
and 2Cl
–
.
E.
Ni
4+
and Cl
–
.
6.
The name of the parent acid of the chlorite ion is
A.
hydrochloric acid.
B.
hydrogen chloride.
C.
chloric acid.
D.
chlorous acid.
E.
hypochlorous acid.
7.
Which of the following ions has a –2 charge?
A.
chlorate ion
B.
sulfite ion
C.
chlorite ion
D.
phosphate ion
E.
nitrite ion
8.
The binary compound CaS is
A.
calcous sulfide.
B.
calcium sulfate.
C.
sulfur calcide.
D.
calcium sulfide.
E.
calcium sulfite.
9.
The name of the compound CuCl
2
·2H
2
O is
A.
copper(III) chloride dihydrate.
B.
cupric(III) chloride dihydrate.
C.
cuprous(II) chloride dihydrate.
D.
cuprate(II) chloride dihydrate.
E.
copper(II) chloride dihydrate.
10.
Which of the following is diarsenic pentoxide?
A.
As
3
O
5
B.
As
2
O
10
C.
As
2
O
5
D.
AsO
4
E.
AsO
5
11.
A millisecond and a microsecond are
A.
10
–3
s and 10
–12
s, respectively.
B.
10
–2
s and 10
–6
s, respectively.
C.
10
–6
s and 10
–9
s, respectively.
D.
10
–3
s and 10
–9
s, respectively.
E.
10
–3
s and 10
–6
s, respectively.
12.
A gold coin with a mass of 96.5 g is placed in exactly 100 mL of water in a graduated cylinder. If 5.0 mL of water are displaced from the cylinder, what is the density of the coin?
A.
4.8 g/mL
B.
19 g/mL
C.
38 g/mL
D.
5.2 g/mL
E.
92 g/mL
13.
A fast chemistry professor runs a 10.0 km race at an average rate of 6.0 min/mi. If 1 mi = 1.61 km, how long does it take to run the race?
A.
96 min
B.
37 min
C.
26 min
D.
9.6 min
E.
36 min
14.
What is the Celsius temperature that corresponds to 98.5°F?
A.
22.7°C
B.
66.5°C
C.
54.7°C
D.
36.9°C
E.
86.7°C
15.
What answer should be reported if 0.57 cm is subtracted from 10.003 cm?
A.
9.43 cm
B.
9.433 cm
C.
9 cm
D.
9.4 cm
E.
9.430 cm
16.
If the molar mass of Ni is 58.71 g/mol, what mass of Ni contains 3.022 mol Ni?
A.
177.4 g
B.
88.70 g
C.
29.48 g
D.
51.47 g
E.
19.43 g
17.
A sample of silver chloride has a mass of 9.000 g. If the sample is found to contain 6.774 g of silver, what is the mass percent of silver in the sample?
A.
75.27%
B.
24.73%
C.
92.69%
D.
60.36%
E.
49.46%
18.
The mass percent composition of hydrogen peroxide is 94.1% oxygen and 5.90% hydrogen. What is the empirical formula of hydrogen peroxide?
A.
HO
B.
H
3
O
C.
H
2
O
2
D.
HO
2
E.
H
2
O
3
19.
The molar mass of fructose, the main sweetener in jams, is 180 g/mol and its empirical formula is CH
2
O. What is its molecular formula?
A.
C
8
H
16
O
8
B.
C
4
H
8
O
4
C.
C
6
H
10
O
D.
C
3
H
6
O
3
E.
C
6
H
12
O
6
20.
What is the mass percentage of hydrogen in aspirin, C
9
H
8
O
4
?
A.
2.24 %
B.
8.96 %
C.
38.1%
D.
80.0 %
E.
4.48 %
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