test bank for General Chemistry 10th Edition by Darrell Ebbing All chapters 1-24||Complete A+ Guide

,Chapter 1 - Chemistry and Measurement
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1. What is a scientific theory?
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A) It is a collection of experimental data.
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B) It is an assertion of scientific fact.
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C) It is a guess or conjecture about natural phenomena.
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D) It is a fundamental relationship of nature.
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E) It is an explanation of natural phenomena that has undergone significant testing.
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ANS: E PTS: 1
u u DIF: easy REF: 1.2
OBJ: Understand how the scientific method is an approach to performing science. u u u u u u u u u u


TOP: general concepts | scientific method MSC: general chemistry
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2. An untested explanation of a series of experimental observations is called
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A) a hypothesis u


B) a theory u


C) a law u


D) an experiment u


E) the scientific method u u




ANS: A PTS: 1
u u DIF: easy REF: 1.2
OBJ: Understand how the scientific method is an approach to performing science. u u u u u u u u u u


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




A) 1 only
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B) 2 only
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C) 3 only
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D) 1 and 2
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E) 1, 2, and 3
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ANS: C PTS: 1
u u DIF: easy REF: 1.2
OBJ: Understand how the scientific method is an approach to performing science. u u u u u u u u u u


TOP: general concepts | scientific method
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4. A saline solution similar to that used for intravenous drips is made by dissolving 0.45 g
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sodium chloride in 50.00 g water. Which of the following statements concerning the
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saline solution and the law of conservation of mass is/are correct?
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1. The mass of the saline solution is greater than the mass of water.
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2. The mass of the saline solution is equal to the combined mass of sodium
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chloride and water.
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3. The mass of the saline solution is greater than the mass of the sodium
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chloride.
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, A) 1 only
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B) 2 only
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C) 3 only
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D) 1 and 2
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E) 1, 2, and 3
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ANS: D PTS: 1
u u DIF: easy REF: 1.3
OBJ: Apply the law of the conservation of mass. u u u u u u u


TOP: general concepts | matter
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5. A 19.0-g sample of lithium is completely burned in air to form lithium oxide. The mass of
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ulithium oxide must be u u u


A) less than 19.0 g. u u u


B) greater than 19.0 g. u u u


C) equal to 19.0 g. u u u


D) all of the above. u u u


E) none of the above. u u u




ANS: B PTS: 1
u u DIF: easy REF: 1.3
OBJ: Apply the law of the conservation of mass. (Example 1.1) u u u u u u u u u


TOP: general concepts | matter
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6. A sample of silicon is burned in oxygen to form silicon dioxide. What mass of oxygen is
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uconsumed if 57.76 g silicon dioxide is formed from 27.00 g silicon?
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A) 30.76 g u


B) 84.76 g u


C) 1559.59 g u


D) 0.47 g u


E) none of the above. u u u




ANS: A PTS: 1
u u DIF: easy REF: 1.3
OBJ: Apply the law of the conservation of mass. u u u u u u u


TOP: general concepts | matter
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7. In a certain chemical reaction, 7.29 g of compound A is added to 5.70 g of compound B.
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uOnce the reaction is complete, 3.60 g of compound A and 1.17 g of compound B remain.
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uWhat mass of products was produced?
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A) 17.76 g u


B) 4.53 g u


C) 8.22 g u


D) 3.69 g u


E) 4.77 g u




ANS: u u C PTS: 1 DIF: easy REF: 1.3
OBJ: Apply the law of the conservation of mass. (Example 1.1)
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TOP: general concepts | matter KEY: Law of Conservation of Mass
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MSC:
u ugeneral chemistry u




8. A 5.77 g sample of calcium carbonate completely decomposes into calcium oxide (lime) and
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carbon dioxide gas when heated. If 3.23 g calcium oxide is produced, what mass of carbon
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dioxide must have been formed?
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, A) 2.54 g u


B) 9.00 g u


C) 18.65 g u


D) 0.56 g u


E) 1.92 g u




ANS: A PTS: 1
u u DIF: easy REF: 1.3
OBJ: Apply the law of the conservation of mass. u u u u u u u


TOP: general concepts | matter
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9. A sample of rubidium carbonate, weighing 7.00 g, requires 2.20 g of hydrogen chloride gas
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uto completely decompose to water, rubidium chloride, and carbon dioxide gas. The total
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umass of water and rubidium chloride formed is 7.90 g and no hydrogen chloride or rubidium
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ucarbonate remains. According to the law of conservation of mass, what mass of carbon
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udioxide must have been formed? u u u u


A) 1.30 g u


B) 0.90 g u


C) 8.65 g u


D) 17.10 g u


E) 3.07 g u




ANS: A PTS: 1
u u DIF: moderate REF: 1.3
OBJ: Apply the law of the conservation of mass. u u u u u u u


TOP: general concepts | matter
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10. Sodium oxide reacts with water to produce sodium hydroxide. Suppose 18.6 g of sodium
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uoxide is combined with 33.7 g of water. When the reaction is complete, all the sodium
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uoxide has been consumed. According to the law of conservation of mass, which is a true
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ustatement?
A) The mass of sodium hydroxide produced must equal 52.3 g.
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B) The mass of unreacted water must equal 15.1 g.
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C) The mass of sodium hydroxide produced must equal 18.6 g.
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D) The mass of water consumed must equal 18.6 g.
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E) The mass of sodium hydroxide produced plus the mass of unreacted water must
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equal 52.3 g.
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ANS: u E PTS: 1 DIF: difficult REF: 1.3
OBJ:
u Apply the law of the conservation of mass. (Example 1.1)
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TOP: general concepts | matter KEY: Law of Conservation of Mass
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MSC:
u ugeneral chemistry u




11. After a certain chemical reaction has completed, it is found that 33.7 g of product was
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uproduced. According to the law of conservation of mass, which statement must be true?
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A) The total mass consumed of all reactants was 33.7 g.
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B) The mass consumed of each reactant was 33.7 g.
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C) The mass of reactants consumed depends on the number of reactants present.
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D) Before the reaction started, there was 33.7 g total of all reactants.
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E) Before the reaction started, there was 33.7 g of each reactant.
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ANS: A PTS: 1
u DIF: difficult REF: 1.3
OBJ: Apply the law of the conservation of mass. (Example 1.1)
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