Chapter 3 Test Practice
MOORE
DO NOT WRITE ON THIS PRACTICE EXAM
1. A sample of an element has a mass of 34.261 grams and
a volume of 3.8 cubic centimeters. To which number of
significant figures should the calculated density of the
sample be expressed?
A) 5
B) 2
C) 3
9. The diagram below represents a Celsius thermometer
recording a certian temperature.
D) 4
2. Which quantity of heat is equal to 200. joules?
A) 20.0 kJ
C) 0.200 kJ
B) 2.00 kJ
D) 0.0200 kJ
3. A temperature of 37 ° C is equivalent to a temperature of
A) 98.6 K
C) 310. K
B) 236 K
D) 371 K
4. Which kelvin temperature is equal to 56° C?
A) -329 K
C) 217 K
B) -217 K
D) 329 K
5. Which kelvin temperature is equivalent to –24ºC?
A) 226 K B) 249 K C) 273 K D) 297 K
6. A student calculates the density of an unknown solid.
The mass is 10.04 grams, and the volume is 8.21 cubic
centimeters. How many significant figures should appear
in the final answer?
A) 1
B) 2
C) 3
D) 4
7. Which mass measurement contains four significant
figures?
A) 0.086 g
C) 1003 g
B) 0.431 g
D) 3870 g
8. Expressed to the correct number of significant figures,
the sum of two masses is 445.2 grams. Which two
masses produce this answer?
A)
B)
C)
D)
210.10 g + 235.100 g
210.100 g + 235.10 g
210.1 g + 235.1 g
210.10 g + 235.10 g
What is the correct reading of the thermometer?
A) 5ºC
B) 4.3ºC C) 0.3ºC D) 4ºC
10. During a laboratory experiment, a sample of aluminum
is found to have a mass of 12.50 grams and a volume of
4.6 milliliters.
What is the density of this sample, expressed to the
correct number of significant figures?
A) 2.717 g/mL
C) 3 g/mL
B) 2.72 g/mL
D) 2.7 g/mL
11. Which quantity is equivalent to 50 kiloJoules?
A) 5000 J
C) 5 × 10 3 J
B) 0.05 J
D) 5 × 10 4 J
12. One kiloJoule is the same as
A) 0.001 Joule
C) 100 Joules
B) 0.01 Joule
D) 1,000 Joules
13. How many kiloJoules are equivalent to 10 Joules?
A) 0.001 kJ
C) 1000 kJ
B) 0.01 kJ
D) 10,000 kJ
14. The measurement 0.41006 gram, rounded to three
significant figures, is expressed as
A) 0.41 g
C) 0.4100 g
B) 0.410 g
D) 0.4101 g
15. A solution contains 12.55 grams of a solid dissolved in
50.0 milliliters of water. What is the number of grams
of solid dissolved per milliliter of water, rounded to the
correct number of significant figures?
A) 0.25 g/mL
C) 0.3 g/mL
B) 0.251 g/mL
D) 0.2510 g/mL
16. Which measurement contains a total of three significant
figures?
A) 0.12
B) 012
C) 120
D) 120.
17. What is the product of (2.324 cm × 1.11 cm) expressed
to the correct number of significant figures?
A) 2.58 cm 2
C) 2.5796 cm2
B) 2.5780 cm2
D) 2.57964 cm2
18. What is the quotient of 8.01 grams divided by 3.127
grams, expressed to the correct number of significant
figures?
A) 2.6
C) 2.562
B) 2.56
D) 2.5616
19. Which quantity expresses the sum of the given masses
to the correct number of significant figures?
22. The mass of a solid is 3.60 grams and its volume is 1.8
cubic centimeters. What is the density of the solid,
expressed to the correct number of significant figures?
A) 2 g/cm3
C) 0.5 g/cm3
B) 2.0 g/cm3
D) 0.50 g/cm3
23. A student collected the data shown below to determine
experimentally the density of distilled water.
Mass of graduated cylinder + distilled H2O sample
.................................................................. 163 g
Mass of empty graduated cylinder .......... 141 g
Mass of distilled H2O sample ........................ g
Volume of distilled H2O sample ........... 24.3 mL
Based on the experimental data collected, what is the
density of the distilled water?
A)
C)
B)
D)
24. Which measurement contains a total of three significant
figures?
A) 0.012 g
C) 1,205 g
B) 0.125 g
D) 12,050g
25. Given:
(52.6 cm) × (1.214 cm)
What is the product expressed to the correct number of
significant figures?
A)
C)
B)
D)
20. The volume of a gas sample is 22.4 liters at STP. The
density of the gas is 1.34 grams per liter. What is the
mass of the gas sample, expressed to the correct
number of significant figures?
A) 16.7 g
C) 30 g
B) 17 g
D) 30.0 g
21. Which measurement contains three significant figures?
A) 0.08 cm
C) 800 cm
B) 0.080 cm
D) 8.08 cm
A) 64 cm 2
C) 63.86 cm 2
B) 63.9 cm 2
D) 63.8564 cm 2
26. When 5.0 grams of solute is added to 25.0 grams of
water at 35.0ºC, the temperature rises to 35.4ºC. What
is the temperature change per gram of solute, expressed
to the correct number of significant figures?
A) 0.08 ºC/g
C) 8.0 ºC/g
B) 0.080 ºC/g
D) 8.00 ºC/g
27. The solid object shown below has a mass of 162.2
grams.
32. Which mass measurement contains a total of three
significant figures?
A) 22.0 g
C) 220 g
B) 22.00 g
D) 2200 g
33. What is the sum of 0.0421 g + 5.263 g + 2.13 g to the
correct number of significant digits?
A) 7 g
C) 7.44 g
What is the density of the object to the correct number
of significant figures?
A) 0.22 g/cm3
C) 4.5 g/cm3
B) 0.2219 g/cm3
D) 4.505 g/cm3
28. In a laboratory exercise to determine the density of a
substance, a student found the mass of the substance to
be 6.00 grams and the volume to be 2.0 milliliters.
Expressed to the correct number of significant figures,
the density of the substance is
A) 3.000 g/ml
C) 3.0 g/ml
B) 3.00 g/ml
D) 3 g/ml
29. Which volume measurement is expressed in four
significant figures?
A) 5.50 ml
C) 5,500 ml
B) 550. ml
D) 5,500. ml
30. When 1.255 grams of X reacts completely with 3.2
grams of Y, Z is the only product of the reaction. What
is the total mass of Z, expressed to the proper number
of significant figures?
A) 4.455 g
C) 4.5 g
B) 4.46 g
D) 5 g
31. The following weighings were made during a
laboratory exercise:
Mass of evaporating dish.....59.260 g
Mass of sugar sample ..........1.61 g
What is the total mass of the evaporating dish plus the
sample, expressed to the proper number of significant
figures?
A) 60.870 g
C) 60.9 g
B) 60.87 g
D) 61 g
B) 7.4 g
D) 7.435 g
34. Which measurement has the greatest number of
significant figures?
A) 6.060 mg
C) 606 mg
B) 60.6 mg
D) 60600 mg
35. A student titrates 10.00 milliliters of hydrochloric acid
of unknown molarity with 1.000 M NaOH. It takes
21.17 milliliters of base to exactly neutralize the acid. If
the student follows the rules for significant figures in
determining the molarity of the acid, what should her
answer be?
A) 2.10 M
C) 2.117 M
B) 2.11 M
D) 2.120 M
36. Which measurement contains three significant figures?
A) 0.05 g
C) 0.056 g
B) 0.050 g
D) 0.0563 g
37. A cube has a volume of 8.0 cm 3 and a mass of 21.6
grams. The density of the cube, in grams per cubic
centimeter, is best expressed as
A) 2.7
B) 2.70
C) 0.37
D) 0.370
38. A student measures the mass and volume of a piece of
aluminum. The measurements are 25.6 grams and 9.1
cubic centimeters. The. student calculates the density of
the aluminum. What is the percent error of the student’s
calculated density of aluminum?
A) 1%
B) 2%
C) 3%
D) 4%
39. A student intended to make a salt solution with a
concentration of 10.0 grams of solute per liter of
solution. When the student’s solution was analyzed, it
was found to contain 8.90 grams of solute per liter of
solution. What was the percent error in the
concentration of the solution?
A) 1.10%
C) 11.0%
B) 8.90%
D) 18.9%
40. A student calculated the percent by mass of water in a
hydrate as 14.2%. A hydrate is a compound that
contains water as part of its crystal structure. If the
accepted value is 14.7%, the student’s percent error was
A)
B)
×100
×
100
C)
D)
×100
A) 9.1% B) 8.3% C) 3.0% D) 11%
×
100
41. A student determined in the laboratory that the percent
by mass of water in CuSO•5H 2O is 40.0%. If the
accepted value is 36%, what is the percent of error?
A) 0.11%
C) 11%
B) 1.1%
D) 4.0%
42. A student found the boiling point of a liquid to be
. If the liquid's actual boiling point is
the experimental percent error is equal to
45. A student determined that the percent of H 2O in a
hydrate was 39.0%. The percent of H 2O in this hydrate
is 36.0% according to an accepted chemistry reference.
What is the student's percent of error?
,
A)
46. In an experiment, a student found that the percent of
oxygen in a sample of
was
. If the
accepted value is
, the experimental percent
error is
A)
B)
C)
D)
47. A laboratory experiment was performed to determine
the percent by mass of water in a hydrate. The accepted
value is 36.0% water. Which observed value has an
error of 5.00%?
A) 31.0% water
C) 37.8% water
B)
C)
B) 36.0% water
D) 41.0% water
48. A student determined the heat of fusion of water to be
88 calories per gram. If the accepted value is 80.
calories per gram, what is the student's percent error?
D)
A) 8.0% B) 10.% C) 11%
43. A student determined the percentage of water of
hydration in BaCl2•2H 2O by using the data in the table
below.
49. A student in a laboratory determined the boiling point
of a substance to be 71.8 ° C. The accepted value for the
boiling point of this substance is 70.2 ° C. What is the
percent error of the student's measurement?
A) 1.60%
C) 2.23%
The accepted percentage value for the water of
hydration is 14.75%. What is the student's percent
error?
A) 1.04%
C) 6.59%
B) 6.00%
D) 7.05%
44. A student calculated the percent by mass of water in a
sample of
to be
, but the
accepted value is
. What was the student's
percent error?
A)
B)
C)
D)
D) 90.%
B) 2.28%
D) 160.%
50. The accepted value for the molar volume of a gas is
22.4 liters. In a laboratory experiment, a student
determines the value to be 24.8 liters. What is the
percent error of the student's measurement?
A) 0.120%
C) 10.7%
B) 0.107%
D) 12.0%
51. Using atomic masses given in the Reference Tables for
Chemistry, the molecular mass for O 2(g) is 32.0. By
experiment a student measured the mass of O 2(g) to be
28.0. What is the percent error in the student's result?
A) 1.25%
C) 12.5%
B) 1.43%
D) 14.3%
52. A student determined in the laboratory that one mole of
KMnO 4 had a mass of 171.54 grams. The mass of one
mole of KMnO4 in an accepted chemistry reference is
158.04 grams. What is the percent error of the mass of
one mole of KMnO4 as determined by the student?
A) 0.787%
C) 8.54%
B) 7.87%
D) 13.5%
53. A student determines that the gram formula mass of
CdO is 133.11 grams. If the accepted value is 128.41
grams, what is the students percent error?
A) 0.366%
C) 3.80%
B) 3.66%
D) 4.53%
54. If the observed value for a density is 0.80 g/ml and the
accepted value is 0.70 g/ml, what is the percent error?
A) 0.17%
C) 17.%
B) 0.14%
D) 14.%
60. At which temperature does an aqueous solution
of LiCl have the highest average kinetic energy?
A) 100ºC
C) 273 K
B) 200ºC
D) 373 K
61. Solid A at 80ºC is immersed in liquid B at 60ºC. Which
statement correctly describes the energy changes
between A and B?
A)
B)
C)
D)
A releases heat and B absorbs heat.
A absorbs heat and B releases heat.
Both A and B absorb heat.
Both A and B release heat.
62. In which beaker would the particles have the highest
average kinetic energy?
A)
B)
C)
D)
55. In a laboratory experiment, the melting point of
compound A was determined to be 82.6ºC. If the
accepted value is 80.5ºC, what is the percent error in
this determination? (Show proper significant figures)
A) 2.5
B) 2.54
C) 2.6
D) 2.71
56. In an experiment the gram atomic mass of magnesium
was determined to be 24.7. Compared to the accepted
value 24.3, the percent error for this determination was
A) 0.400 B) 1.65
C) 24.7
D) 98.4
57. Which sample of ethanol has particles with the highest
average kinetic energy?
A)
B)
C)
D)
10.0 mL of ethanol at 25 ° C
10.0 mL of ethanol at 55 ° C
100.0 mL of ethanol at 35 ° C
100.0 mL of ethanol at 45 ° C
58. In which sample is the average kinetic energy of the
particles greatest?
A)
B)
C)
D)
10. mL of HCl(aq) at 25 ° C
15 mL of HCl(aq) at 20. ° C
10. mL of H2O( ) at 35° C
15 mL of H 2O( ) at 30.° C
59. The temperature of a sample of nitrogen gas is a
measure of the molecules' average
A) activation energy
C) kinetic energy
B) potential energy
D) ionization energy
63. The average kinetic energies of the molecules in two
gas samples could best be compared by measuring their
A) temperatures
C) pressures
B) volumes
D) densities
64. The temperature of a substance is a measure of its
particles
A)
B)
C)
D)
average potential energy
average kinetic energy
specific heat
total energy
65. The molecules of which substance have the highest
average kinetic energy?
A) He(g) at 0ºC
C) HCl(g) at 40ºC
B) CO 2(g) at 20ºC
D) N2(g) at 60ºC
66. The compound whose molecules have the highest
average kinetic energy is
A) NO(g) at 25 ° C
C) NO 2(g) at 30° C
B) N2O(g) at 15° C
D) N2O3(g) at 20 ° C
67. Which temperature is equal to 120. K?
A) –153 ° C
C) +293 ° C
B) –120. ° C
D) +393 ° C
68. The temperature 30. K expressed in degrees Celsius is
A) 243ºC
C) 303ºC
B) –243ºC
D) –303ºC
69. At standard pressure, the difference between the
freezing point and the boiling point of water, in Kelvin,
is
A) 100
B) 180
C) 273
D) 373
70. Which temperature is equal to +20 K?
A) –253ºC
C) 253 ° C
B) –293ºC
D) 293 ° C
Answer Key
Unit 2 Test
1.
B
37.
A
2.
C
38.
D
3.
C
39.
C
4.
D
40.
C
5.
B
41.
C
6.
C
42.
A
7.
C
43.
D
8.
C
44.
C
9.
B
45.
B
10.
D
46.
D
11.
D
47.
C
12.
D
48.
B
13.
B
49.
B
14.
B
50.
C
15.
B
51.
C
16.
D
52.
C
17.
A
53.
B
18.
B
54.
D
19.
C
55.
C
20.
D
56.
B
21.
D
57.
B
22.
B
58.
C
23.
C
59.
C
24.
B
60.
B
25.
B
61.
A
26.
A
62.
C
27.
C
63.
A
28.
C
64.
B
29.
D
65.
D
30.
C
66.
C
31.
B
67.
A
32.
A
68.
B
33.
C
69.
A
34.
A
70.
A
35.
C
36.
D