1. The molecular formula of a particular solid is C8H4O6. Its molecular mass is
a. 288 amu.
b. 100 amu.
c. 296 amu.
d. 196 amu.
e. 170 amu.
ANSWER: d
POINTS: 1
DIFFICULTY: easy
REFERENCES: 3.1
LEARNING OBJECTIVES: GENE.EBBI.13.67 - Calculate the formula mass from ...
,Chapter 01 - Chemistry and Measurement
1. What is a scientific theory?
a. It is a collection of experimental data.
b. It is an assertion of scientific fact.
c. It is a guess or conjecture about natural phenomena.
d. It is a fundamental relationship of nature.
e. It is an explanation of natural phenomena that has undergone significant testing.
ANSWER: e
POINTS: 1
DIFFICULTY: easy
REFERENCES: 1.2
HAS VARIABLES: False
LEARNING OBJECTIVE GENE.EBBI.13.1 - Understand how the scientific method is an approach to
S: performing science.
TOPICS: general concepts
scientific method
OTHER: general chemistry
2. An untested explanation of a series of experimental observations is called _____.
a. a hypothesis
b. a theory
c. a law
d. an experiment
e. the scientific method
ANSWER: a
POINTS: 1
DIFFICULTY: easy
REFERENCES: 1.2
HAS VARIABLES: False
LEARNING OBJECTIVE GENE.EBBI.13.1 - Understand how the scientific method is an approach to
S: performing science.
TOPICS: general concepts
scientific method
3. Which of the following statements concerning experiment and explanation is/are true?
1. A law is always given in the form of a mathematical expression.
2. Once a hypothesis passes one or two tests it is considered a theory.
3. Observation is a key component of the scientific method.
a. 1 only
b. 2 only
c. 3 only
d. 1 and 2
e. 1, 2, and 3
Copyright Cengage Learning. Powered by Cognero. Page 1
,Chapter 01 - Chemistry and Measurement
ANSWER: c
POINTS: 1
DIFFICULTY: easy
REFERENCES: 1.2
HAS VARIABLES: False
LEARNING OBJECTIVE GENE.EBBI.13.1 - Understand how the scientific method is an approach to
S: performing science.
TOPICS: general concepts
scientific method
4. A saline solution similar to that used for intravenous drips is made by dissolving 0.45 g sodium chloride in
50.00 g water. Which of the following statements concerning the saline solution and the law of conservation of
mass is/are correct?
1. The mass of the saline solution is greater than the mass of water.
2. The mass of the saline solution is equal to the combined mass of sodium chloride and water.
3. The mass of the saline solution is greater than the mass of the sodium chloride.
a. 1 only
b. 2 only
c. 3 only
d. 1 and 2
e. 1, 2, and 3
ANSWER: d
POINTS: 1
DIFFICULTY: easy
REFERENCES: 1.3
HAS VARIABLES: False
LEARNING OBJECTIVES: GENE.EBBI.13.2 - Apply the law of the conservation of mass.
TOPICS: general concepts
matter
5. A 54.0-g sample of sodium is completely burned in air to form sodium oxide. The mass of sodium oxide
must be
a. less than 54.0 g.
b. greater than 54.0 g.
c. equal to 54.0 g.
d. all of the above.
e. none of the above.
ANSWER: b
POINTS: 1
DIFFICULTY: easy
REFERENCES: 1.3
HAS VARIABLES: True
Copyright Cengage Learning. Powered by Cognero. Page 2
, Chapter 01 - Chemistry and Measurement
LEARNING OBJECTIVES: GENE.EBBI.13.3 - Apply the law of the conservation of mass. (Example 1.1)
TOPICS: general concepts
matter
6. A sample of magnesium is burned in oxygen to form magnesium oxide. What mass of oxygen is consumed if
74.62 g magnesium oxide is formed from 45.00 g magnesium?
a. 29.62 g
b. 119.62 g
c. 3358.06 g
d. 0.60 g
e. none of the above.
ANSWER: a
POINTS: 1
DIFFICULTY: easy
REFERENCES: 1.3
HAS VARIABLES: True
LEARNING OBJECTIVES: GENE.EBBI.13.2 - Apply the law of the conservation of mass.
TOPICS: general concepts
matter
7. In a certain chemical reaction, 9.11 g of compound A is added to 8.82 g of compound B. Once the reaction is
complete, 1.38 g of compound A and 1.61 g of compound B remain. What mass of products was produced?
a. 20.92 g
b. 7.21 g
c. 14.94 g
d. 7.73 g
e. 2.99 g
ANSWER: c
POINTS: 1
DIFFICULTY: easy
REFERENCES: 1.3
HAS VARIABLES: True
LEARNING OBJECTIVES: GENE.EBBI.13.3 - Apply the law of the conservation of mass. (Example 1.1)
TOPICS: general concepts
matter
KEYWORDS: Law of Conservation of Mass
OTHER: general chemistry
8. A 7.45 g sample of calcium carbonate completely decomposes into calcium oxide (lime) and carbon dioxide
gas when heated. If 4.17 g calcium oxide is produced, what mass of carbon dioxide must have been formed?
a. 3.28 g
b. 11.62 g
Copyright Cengage Learning. Powered by Cognero. Page 3
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