REFERENCES: 1.2 - Copyright Cengage Learning. Powered by Cognero....

Chapter 01 - Chemistry and Measurement

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• What is a scientific theory?
• It is a collection of experimental data.
• It is an assertion of scientific fact.
• It is a guess or conjecture about natural phenomena.
• It is a fundamental relationship of nature.
• 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 OBJECTIVES: GENE.EBBI.13.1 - Understand how the scientific method is an approach to performing science.

TOPICS: general concepts

scientific method

OTHER: general chemistry

• An untested explanation of a series of experimental observations is called _____.
• a hypothesis
• a theory
• a law
• an experiment
• the scientific method

ANSWER: a

POINTS: 1

DIFFICULTY: easy

REFERENCES: 1.2

HAS VARIABLES: False

LEARNING OBJECTIVES: GENE.EBBI.13.1 - Understand how the scientific method is an approach to performing science.

TOPICS: general concepts

scientific method

• Which of the following statements concerning experiment and explanation is/are true?
• A law is always given in the form of a mathematical expression.
• Once a hypothesis passes one or two tests it is considered a theory.
• Observation is a key component of the scientific method.
• 1 only
• 2 only
• 3 only
• 1 and 2
• 1, 2, and 3

(General Chemistry, 11e Darrell Ebbing, Steven D. Gammon ) (Test Bank all Chapters) 1 / 4

Chapter 01 - Chemistry and Measurement

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ANSWER: c

POINTS: 1

DIFFICULTY: easy

REFERENCES: 1.2

HAS VARIABLES: False

LEARNING OBJECTIVES: GENE.EBBI.13.1 - Understand how the scientific method is an approach to performing science.

TOPICS: general concepts

scientific method

• 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?

• 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.

• The mass of the saline solution is greater than the mass of the sodium chloride.
• 1 only
• 2 only
• 3 only
• 1 and 2
• 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

• A 54.0-g sample of sodium is completely burned in air to form sodium oxide. The mass of sodium oxide

must be

• less than 54.0 g.
• greater than 54.0 g.
• equal to 54.0 g.
• all of the above.
• none of the above.

ANSWER: b

POINTS: 1

DIFFICULTY: easy

REFERENCES: 1.3 2 / 4

Chapter 01 - Chemistry and Measurement

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HAS VARIABLES: True

LEARNING OBJECTIVES: GENE.EBBI.13.3 - Apply the law of the conservation of mass. (Example 1.1)

TOPICS: general concepts

matter

• 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?

• 29.62 g
• 119.62 g
• 3358.06 g
• 0.60 g
• 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

• 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?

• 20.92 g
• 7.21 g
• 14.94 g
• 7.73 g
• 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

• 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?

• 3.28 g 3 / 4

Chapter 01 - Chemistry and Measurement

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• 11.62 g
• 31.10 g
• 0.56 g
• 2.48 g

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

• A sample of cesium carbonate, weighing 3.80 g, requires 1.90 g of hydrogen bromide gas to completely

decompose to water, cesium bromide, and carbon dioxide gas. The total mass of water and cesium bromide formed is 5.20 g and no hydrogen bromide or cesium carbonate remains. According to the law of conservation of mass, what mass of carbon dioxide must have been formed?

• 0.50 g
• 1.40 g
• 5.49 g
• 10.90 g
• 1.90 g

ANSWER: a

POINTS: 1

DIFFICULTY: moderate

REFERENCES: 1.3

HAS VARIABLES: True

LEARNING OBJECTIVES: GENE.EBBI.13.2 - Apply the law of the conservation of mass.

TOPICS: general concepts

matter

• Sodium oxide reacts with water to produce sodium hydroxide. Suppose 11.1 g of sodium oxide is combined

with 38.7 g of water. When the reaction is complete, all the sodium oxide has been consumed. According to the law of conservation of mass, which is a true statement?

• The mass of sodium hydroxide produced must equal 49.8 g.
• The mass of unreacted water must equal 27.6 g.
• The mass of sodium hydroxide produced must equal 11.1 g.
• The mass of water consumed must equal 11.1 g.
• The mass of sodium hydroxide produced plus the mass of unreacted water must equal 49.8 g.

ANSWER: e

POINTS: 1

DIFFICULTY: difficult

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