1. What is a unifying principle that explains a body of experimental observations?
A. Law
B. Hypothesis
C. Theory
D. Phenomena
E. Prediction
... [Show More]
Blooms: 2. Understand
Difficulty: Easy
Gradable: automatic
Subtopic: Scientific Method
Topic: Study of Chemistry
2. Which of the following is a tentative explanation for a set of observations?
A. Law
B. Hypothesis
C. Theory
D. Phenomena
E. Prediction
Blooms: 2. Understand
Difficulty: Easy
Gradable: automatic
Subtopic: Scientific Method
Topic: Study of Chemistry
3. What is the term used for findings that are summarized based on a pattern or trend?
A. Law
B. Hypothesis
C. Theory
D. Phenomena
E. Prediction
Blooms: 2. Understand
Difficulty: Easy
Gradable: automatic
Subtopic: Scientific Method
Topic: Study of Chemistry
4. Which of the following activities is not a part of good science?
A. Proposing a theory
B. Developing a hypothesis
C. Making quantitative observations
D. Designing experiments
E. Indulging in speculation
Blooms: 2. Understand
Difficulty: Easy
Gradable: automatic
Subtopic: Scientific Method
Topic: Study of Chemistry
5. Which of the following is a ‘substance’ according to the definition given in your textbook?
A. Air
B. Tap water
C. Sea water
D. Water
E. Toothpaste
Blooms: 3. Apply
Difficulty: Medium
Gradable: automatic
Subtopic: Classification and States of Matter
Subtopic: Properties of Matter
Topic: Study of Chemistry
1-2
6. Which of the following cannot be separated into simpler substances by chemical means?
A. Element
B. Emulsion
C. Compound
D. Homogeneous mixture
E. Heterogeneous mixture
Blooms: 4. Analyze
Difficulty: Medium
Gradable: automatic
Subtopic: Classification and States of Matter
Subtopic: Properties of Matter
Topic: Study of Chemistry
7. If a liquid contains 60% sugar and 40% water throughout its composition then what is it called?
A. Solute
B. Compound
C. Homogeneous mixture
D. Heterogeneous mixture
E. Solvent
Blooms: 4. Analyze
Difficulty: Medium
Gradable: automatic
Subtopic: Classification and States of Matter
Subtopic: Properties of Matter
Topic: Study of Chemistry
8. Which of the following does not have a uniform composition throughout?
A. Element
B. Compound
C. Homogeneous mixture
D. Heterogeneous mixture
E. Solvent
Blooms: 3. Apply
Difficulty: Easy
Gradable: automatic
Subtopic: Classification and States of Matter
Subtopic: Properties of Matter
Topic: Study of Chemistry
9. Which of the following is not an SI base unit?
A. Meter
B. Ampere
C. Second
D. Gram
E. Kelvin
Blooms: 2. Understand
Difficulty: Medium
Gradable: automatic
Subtopic: Measurement (SI Units)
Topic: Study of Chemistry
10. The SI base unit of mass is
A. mg.
B. g.
C. kg.
D. metric ton.
E. lb.
Blooms: 1. Remember
Difficulty: Medium
Gradable: automatic
Subtopic: Measurement (SI Units)
Topic: Study of Chemistry
1-3
11. The SI prefix mega- (M) means
A. 10–6
B. 10–3
C. 103
D. 106
E. 109
Blooms: 1. Remember
Difficulty: Easy
Gradable: automatic
Subtopic: Measurement (SI Units)
Topic: Study of Chemistry
12. The SI prefixes milli- and mega- represent, respectively
A. 106
and 10–6
B. 10–3 and 106
C. 103
and 10–6
D. 10–3 and 109
E. 10–6 and 10–3
.
Blooms: 1. Remember
Difficulty: Medium
Gradable: automatic
Subtopic: Measurement (SI Units)
Topic: Study of Chemistry
13. How many micrograms are in 65.3 kg?
A. 0.653 µg
B. 6.53 × 107 µg
C. 6.53 × 104 µg
D. 6.53 × 10–8 µg
E. 6.53 × 1010 µg
Blooms: 3. Apply
Difficulty: Hard
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
14. A dose of medication was prescribed to be 35 microliters. Which of the following expresses that volume in centiliters?
A. 3.5 × 105
cL
B. 3.5 × 104
cL
C. 3.5 cL
D. 3.5 × 10–4 cL
E. 3.5 × 10–3 cL
Blooms: 3. Apply
Difficulty: Hard
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
15. How many milliliters is 0.0055 L?
A. 0.55 mL
B. 5.5 mL
C. 0.5 mL
D. 0.0000055 mL
E. 182 mL
Blooms: 3. Apply
Difficulty: Medium
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
1-4
16. How many hertz is 600.11 MHz?
A. 6.0011 × 10–4 Hz
B. 60.011 Hz
C. 6.0011 × 106 Hz
D. 6.0011 × 10–2 Hz
E. 6.0011 × 108 Hz
Blooms: 3. Apply
Difficulty: Medium
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
17. The distance between carbon atoms in ethylene is 134 picometers. Which of the following expresses that distance in
meters?
A. 1.34 × 10–13 m
B. 1.34 × 10–12 m
C. 1.34 × 10–10 m
D. 1.34 × 10–7 m
E. 1.34 × 10–6 m
Blooms: 3. Apply
Difficulty: Medium
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
18. Which of these quantities represents the largest mass?
A. 2.0 × 102 mg
B. 0.0010 kg
C. 1.0 × 105 µg
D. 2.0 × 102
cg
E. 10.0 dg
Blooms: 4. Analyze
Difficulty: Hard
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Topic: Study of Chemistry
19. The mass of a sample is 550 milligrams. Which of the following expresses that mass in kilograms?
A. 5.5 × 108 kg
B. 5.5 × 105 kg
C. 5.5 × 10–4 kg
D. 5.5 × 10–6 kg
E. 5.5 × 10–1 kg
Blooms: 3. Apply
Difficulty: Hard
Gradable: automatic
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
20. The average distance between the Earth and the Moon is 240,000 miles. Express this distance in kilometers. (1 mi = 1609
m)
A. 6.1 × 105 km
B. 5.3 × 105 km
C. 3.9 × 105 km
D. 1.5 × 105 km
E. 9.4 × 104 km
Blooms: 3. Apply
Difficulty: Medium
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
1-5
21. How many inches are in 382.5 cm? (1 in = 2.54 cm)?
A. 150.6 in
B. 6.641 × 10–3 in
C. 151 in
D. 971.6 in
E. 972 in
Blooms: 3. Apply
Difficulty: Medium
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
22. How many cubic inches are in 1.00 liter? (1 in = 2.54 cm)
A. 61.0 in3
B. 155 in3
C. 394 in3
D. 1.64 × 104
in3
E. none of them
Blooms: 3. Apply
Difficulty: Hard
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
23. How many inches are in 382.5 cm? (1 in = 2.54 cm)
A. 150.6 in
B. 6.641 × 10–3 in
C. 151 in
D. 971.6 in
E. 972 in
Blooms: 3. Apply
Difficulty: Medium
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
24. Given that 1 inch = 2.54 cm, 1.00 cm3
is equal to
A. 16.4 in3
B. 6.45 in3
C. 0.394 in3
D. 0.155 in3
E. 0.0610 in3
Blooms: 3. Apply
Difficulty: Hard
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
25. A large pizza has a diameter of 15 inches. Express this diameter in centimeters. (1 in = 2.54 cm)
A. 38 cm
B. 24 cm
C. 18 cm
D. 9.3 cm
E. 5.9 cm
Blooms: 3. Apply
Difficulty: Medium
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
1-6
26. The average distance between the Earth and the Moon is 240,000 miles. Express this distance in meters. (1 mi = 1609 m)
A. 6.1 × 105
m
B. 5.3 × 105
m
C. 3.9 × 108
m
D. 1.5 × 105
m
E. 9.4 × 104
m
Blooms: 3. Apply
Difficulty: Medium
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
27. What is the volume in milliliters of a 32.0 fl oz can of juice? (1 fl oz = 29.6 mL)
A. 1.08 mL
B. 947 mL
C. 0.925 mL
D. 0.95 mL
E. 1.1 mL
Blooms: 3. Apply
Difficulty: Medium
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
28. How many mm3
are in 16.7 cm3
?
A. 1.67 × 10–5 mm3
B. 1.67 × 10–8 mm3
C. 1.67 × 107 mm3
D. 1.67 × 104 mm3
E. 1.67 × 10–4 mm3
Blooms: 3. Apply
Difficulty: Hard
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
29. If a patient in the hospital is running a temperature of 39.5°C, what is this in degrees Fahrenheit?
A. 99°F
B. 101.3°F
C. 102.4°F
D. 103.1°F
E. 104°F
Blooms: 3. Apply
Difficulty: Medium
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
30. If normal body temperature is 98.6°F then what is this in degrees Celsius?
A. 34°C
B. 35.5°C
C. 36.4°C
D. 37.0°C
E. 38.7°C
Blooms: 3. Apply
Difficulty: Medium
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
1-7
31. Express 122.0°F in °C.
A. 50.0°C
B. 64.4°C
C. 67.8°C
D. 162.0°C
E. 219.6°C
Blooms: 3. Apply
Difficulty: Medium
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
32. The boiling point for liquid helium is 4.0 K. What is the temperature in degrees Fahrenheit?
A. –452.5°F
B. –498.9°F
C. –237.2°F
D. 131.8°F
E. 530.9°F
Blooms: 3. Apply
Difficulty: Hard
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
33. If the temperature is 38.0°F then what is the temperature in kelvins?
A. 3.33 K
B. 100.4 K
C. 276.5 K
D. 311.15 K
E. 235.15 K
Blooms: 3. Apply
Difficulty: Hard
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
34. Dry ice (carbon dioxide) changes from a solid to a gas at –78.5°C. What is this temperature in °F?
A. –173°F
B. –12.6°F
C. –109°F
D. –75.6°F
E. None of them is within 2°F of the right answer.
Blooms: 3. Apply
Difficulty: Hard
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
35. The boiling point for liquid nitrogen is 77 K. What is the temperature in degrees Fahrenheit?
A. –127°F
B. –289°F
C. –321°F
D. 177°F
E. 662°F
Blooms: 3. Apply
Difficulty: Hard
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
1-8
36. Acetone, which is used as a solvent and as a reactant in the manufacture of Plexiglas®, boils at 56.1°C. What is the
boiling point in degrees Fahrenheit?
A. 159°F
B. 133°F
C. 101°F
D. 69.0°F
E. 43.4°F
Blooms: 3. Apply
Difficulty: Medium
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
37. Isopropyl alcohol, commonly known as rubbing alcohol, boils at 82.4°C. What is the boiling point in kelvins?
A. 387.6 K
B. 355.6 K
C. 323.6 K
D. 190.8 K
E. –190.8 K
Blooms: 3. Apply
Difficulty: Medium
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
38. Acetic acid boils at 244.2°F. What is its boiling point in degrees Celsius?
A. 382.0°C
B. 167.7°C
C. 153.4°C
D. 117.9°C
E. 103.7°C
Blooms: 3. Apply
Difficulty: Medium
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
39. What is the volume of a container that contains 14.3 g of a substance having a density of 0.988 g/cm3
?
A. 14.1 cm3
B. 0.0691 cm3
C. 14.5 cm3
D. 141 cm3
E. 691 cm3
Blooms: 4. Analyze
Difficulty: Medium
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
40. If you have a graduated cylinder containing 15.5 mL and this volume changes to 95.2 mL after a metal with a mass of
7.95 g is dropped into the graduated cylinder, then what is the density of this metal?
A. 0.0835 g/mL
B. 0.513 g/mL
C. 0.0718 g/mL
D. 10.0 g/mL
E. 9.97 × 10–2 g/mL
Blooms: 4. Analyze
Difficulty: Hard
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
1-9
41. The density of mercury, the only metal to exist as a liquid at room temperature, is 13.6 g/cm3. What is that density in
pounds per cubic inch? (1 in = 2.54 cm; 1 lb = 454 g)
A. 849 lb/in3
B. 491 lb/in3
C. 376 lb/in3
D. 0.491 lb/in3
E. 1.83 × 10–3 lb/in3
Blooms: 4. Analyze
Difficulty: Hard
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
42. Radio waves travel at the speed of light, which is 3.00 × 108
m/s. How many minutes does it take for a radio message to
reach Earth from Saturn if Saturn is 7.9 × 108
km from Earth?
A. 4.4 × 10–2 min
B. 1.6 × 105 min
C. 4.0 × 1015 min
D. 44 min
E. 2.6 min
Blooms: 4. Analyze
Difficulty: Hard
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
43. The speed needed to escape the pull of Earth's gravity is 11.3 km/s. What is this speed in mi/h? (1 mile = 1609 m)
A. 65,500 mi/h
B. 25,300 mi/h
C. 18,200 mi/h
D. 1,090 mi/h
E. 5.02 × 10–3 mi/h
Blooms: 4. Analyze
Difficulty: Hard
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
44. Radio waves travel at the speed of light, which is 3.00 × 108
m/s. How many kilometers will radio messages to outer
space travel in exactly one year? (365.24 days = 1 y)
A. 9.46 × 1015 km
B. 7.30 × 108
km
C. 7.10 × 1010 km
D. 9.47 × 1012 km
E. 3.33 × 10– 3 km
Blooms: 4. Analyze
Difficulty: Hard
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
1-10
45. The diameter of Earth is 12.7 Mm. Express this diameter in centimeters.
A. 1.27 × 105
cm
B. 1.27 × 106
cm
C. 1.27 × 107
cm
D. 1.27 × 108
cm
E. 1.27 × 109
cm
Blooms: 4. Analyze
Difficulty: Hard
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
46. Some molecules move with speeds approaching the "escape velocity" from Earth, which is 7.0 miles per second. What is
this speed in cm/h? (1 mi = 1609 m)
A. 313 cm/h
B. 4.1 × 105
cm/h
C. 4.1 × 109
cm/h
D. 1.1 × 106
cm/h
E. 1.6 × 109
cm/h
Blooms: 4. Analyze
Difficulty: Hard
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
47. The city of Los Angeles is now approximately 2400 miles south of Anchorage, Alaska. It is moving slowly northward as
the San Andreas fault slides along. If Los Angeles is to arrive near Anchorage in 76 million years, at what average rate will it
have to move in mm per month? (1 mi = 1609 m)
A. 2.0 × 10–10 mm/mo.
B. 6.6 × 10–6 mm/mo.
C. 4.2 mm/mo.
D. 9.5 mm/mo.
E. 51 mm/mo.
Blooms: 4. Analyze
Difficulty: Hard
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
48. Which of the following speeds is the greatest? (1 mi = 1609 m)
A. 40 mi/h
B. 2.0 × 105 mm/min
C. 40 km/h
D. 0.74 km/min
E. 400 m/min
Blooms: 5. Evaluate
Difficulty: Hard
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
1-11
49. Iron has a density of 7.87 g/cm3
. What mass of iron would be required to cover a football playing surface of 120 yds ×
60. yds to a depth of 1.0 mm? (1 inch = 2.54 cm)
A. 76 kg
B. 47 Mg
C. 7.6 × 105
g
D. 4.7 × 108
g
E. 1.9 × 107
g
Blooms: 4. Analyze
Difficulty: Hard
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
50. The recommended daily allowance (RDA) of calcium is 1.2 g. Calcium carbonate contains 12.0% calcium by mass. How
many grams of calcium carbonate are needed to provide the RDA of calcium?
A. 0.10 g
B. 0.14 g
C. 1.2 g
D. 10. g
E. 14 g
Blooms: 4. Analyze
Difficulty: Hard
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
51. One of the common intravenous fluids, called physiological saline, is a homogeneous mixture of NaCl in water. In this
mixture, 0.89% of the mass is contributed by the NaCl. What mass of NaCl is found in 450. mL of physiological saline?
((Density of physiological saline = 1.005 g/cm3
)
A. 2.0 g
B. 4.0 g
C. 5.1 g
D. 508 g
E. 400 g
Blooms: 4. Analyze
Difficulty: Hard
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
52. An empty flask's mass is 17.4916 g, and its mass is 43.9616 g when filled with water at 20.0°C (density = 0.9982 g/mL).
The density of “heavy water” at 20.0°C is 1.1053 g/mL. What is the mass of the flask when filled with heavy water at
20.0°C?
A. 29.2573 g
B. 46.8016 g
C. 46.7489 g
D. 29.3100 g
E. 43.9140 g
Blooms: 4. Analyze
Difficulty: Hard
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
1-12
53. A flask has a mass of 78.23 g when empty and 593.63 g when filled with water. When the same flask is filled with
concentrated sulfuric acid, H2SO4, its mass is 1026.57 g. What is the density of concentrated sulfuric acid? (Assume water
has a density of 1.00 g/cm3
at the temperature of the measurement.)
A. 1.992 g/cm3
B. 1.840 g/cm3
C. 1.729 g/cm3
D. 1.598 g/cm3
E. 0.543 g/cm3
Blooms: 4. Analyze
Difficulty: Hard
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
54. Talc is a mineral with low conductivity for heat and electricity which is not attacked by acid. It is used in talcum powder
and face powder. Suppose a sample of talc weighs 13.65 g with a density of 1.75 g/cm3
in mineral oil. If this same sample of
talc in air weighs 35.97 g, assuming no volume change, what is the density of the talc sample in air?
A. 4.61 g/cm3
B. 2.82 g/cm3
C. 2.63 g/cm3
D. 2.44 g/cm3
E. 1.61 g/cm3
Blooms: 4. Analyze
Difficulty: Hard
Gradable: automatic
Subtopic: Dimensional Analysis
Subtopic: Measurement (SI Units)
Subtopic: Scientific Notation and Significant Figures
Topic: Study of Chemistry
55. Which of the following is an example of an observation?
A. Gases expand as their temperature increases because the gas molecules are moving more rapidly.
B. Paraffin wax begins to melt at 57°C.
C. Three samples of wax are heated to 75°C.
D. The force acting on an object is equal to its mass times its acceleration.
E. Will all waxes melt at the same temperature?
Blooms: 2. Understand
Difficulty: Easy
Gradable: automatic
Subtopic: Properties of Matter
Subtopic: Scientific Method
Topic: Study of Chemistry
56. Which of the following is a chemical change?
A. Boiling water
B. Melting wax
C. Broiling a steak on a grill
D. Condensing water vapor into rainfall
E. Carving a piece of wood
Blooms: 3. Apply
Difficulty: Easy
Gradable: automatic
Subtopic: Classification and States of Matter
Subtopic: Properties of Matter
Topic: Study of Chemistry
57. Which of these is an example of a physical property?
A. Corrosiveness of sulfuric acid
B. Toxicity of cyanide
C. Flammability of gasoline
D. Neutralization of stomach acid with an antacid
E. Lead becomes a liquid when heated to 601° [Show Less]