20 Questions from past exams.
Practice for speed. Aim
for 1 minute per problem.
1.
The bonding forces between
atoms in a molecule tend to minimize their:
A)
kinetic energy
B)
potential energy
C)
kinetic energy and potential energy
2.
The
kinetic energy per molecule is highest in
A)
solid oxygen
B)
liquid oxygen
C)
gaseous oxygen
3.
Oxygen (O2)
and ozone (O3) are
A)
related by a physical change
B)
related by a chemical change
C)
structural isomers
4.
The
boiling point of oxygen (-239°C) on the Kelvin scale is
A)
239
B)
512
C)
-72
D)
34
E)
72
5.
The
heat capacity of one gram of water is 1.00 cal/°C at
15°C.
What is it in
Joule/°F? (1
cal = 4.184 Joule)
A)
1.97
B)
0.133
C)
7.53
D)
0.430
E)
2.32
6.
In
Centigrade the temperature of a reaction at 500°F is
A)
900
B)
260
C)
278
D)
296
E) 468
7.
The
radius of a hydrogen atom is 0.529 × 10-8
cm. What is the diameter of the atom in pm?
A)
106.
B)
105.
C)
10.6
D)
10.5
E) 105.8
8.
What
is the area (cm2) of a rectangle whose sides
are measured to be 14.85 cm and 2.37cm?
A)
35.1945
B)
35.194
C)
35.19
D)
35.2
E)
35.
9.
What
is the total mass (kg) of three pieces of iron whose
individual masses were measured to be 10.146
kg, 4.25 kg, and 12568. g?
A)
26.97
B)
27.0
C)
26.9
D)
26.96
E)
26.964
10.
If
the measured pH of a solution is 4.81 then 10-pH
is
A)
1.56
× 10-5
B)
1.55
× 10-5
C)
1.54
× 10-5
11.
If
PV = RT then T/V =
A)
PR
B)
P+R
C)
P-R
D)
R/P
E)
P/R
12.
The mass percent of A in a
two-component mixture of A and B is 43.15%. What
is the mass of B in 75.23 g of the mixture?
A)
32.46
g
B)
56.85
C)
67.54
D)
42.77
E)
59.30
13.
Solve
for x taking into account significant figures:
(5.66128 - 2.5943)(x + 0.12) = (24.1137)(8.8136)
A)
69.
B)
69.18
C)
69.176
D)
69.2
E)
69.1757
14.
What
is the
volume of 15.33 g of material whose density is 1.672 g/mL?
A)
9.169
mL
B
9.1687
C
9.17
D)
9.16866
E)
9.2
15.
An
atom has a radius of 10-8 cm and
its nucleus has a radius of 10-13 cm.
If a model has a nuclear radius of 1. ft then the radius
of the model atom in miles (1 mi = 5280 ft) is
A)
180
B)
18.9
C)
20
D)
19
E)
189
Questions
16-20 should help you become more familiar with your
calculator.
16.
In
scientific notation 242.08 is
A)
2.4208
× 10-2
B)
2.4208
× 10-1
C)
2.4208
D)
2.4208
× 101
E)
2.4208
× 102
17.
Evaluate
3.414 (16.1846)2 taking into account
significant figures.
