Type:
Test Bank
Resource:
General Chemistry
Edition:
10th
Author(s):
Darrell D Ebbing Steven D Gammon
Chapter 1 - 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. ANS: E PTS: 1 DIF: easy REF: 1.2 OBJ: Understand how the scientific method is an approach to performing science. TOP: general concepts | scientific method MSC: 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 ANS: A PTS: 1 DIF: easy REF: 1.2 OBJ: Understand how the scientific method is an approach to performing science. TOP: general concepts | scientific method 3. Which of the following statements concerning experiment and explanation is/are true? 1. 2. 3.
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.
A) 1 only B) 2 only C) 3 only D) 1 and 2 E) 1, 2, and 3 ANS: C PTS: 1 DIF: easy REF: 1.2 OBJ: Understand how the scientific method is an approach to performing science. TOP: 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. 2. 3.
The mass of the saline solution is greater than the mass of water. 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.
Test Bank
General Chemistry, 10th edition
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A) 1 only B) 2 only C) 3 only D) 1 and 2 E) 1, 2, and 3 ANS: D PTS: 1 DIF: easy OBJ: Apply the law of the conservation of mass. TOP: general concepts | matter
REF: 1.3
5. A 19.0-g sample of lithium is completely burned in air to form lithium oxide. The mass of lithium oxide must be A) less than 19.0 g. B) greater than 19.0 g. C) equal to 19.0 g. D) all of the above. E) none of the above. ANS: B PTS: 1 DIF: easy REF: 1.3 OBJ: Apply the law of the conservation of mass. (Example 1.1) TOP: general concepts | matter 6. A sample of silicon is burned in oxygen to form silicon dioxide. What mass of oxygen is consumed if 57.76 g silicon dioxide is formed from 27.00 g silicon? A) 30.76 g B) 84.76 g C) 1559.59 g D) 0.47 g E) none of the above. ANS: A PTS: 1 DIF: easy OBJ: Apply the law of the conservation of mass. TOP: general concepts | matter
REF: 1.3
7. In a certain chemical reaction, 7.29 g of compound A is added to 5.70 g of compound B. Once the reaction is complete, 3.60 g of compound A and 1.17 g of compound B remain. What mass of products was produced? A) 17.76 g B) 4.53 g C) 8.22 g D) 3.69 g E) 4.77 g ANS: C PTS: 1 DIF: easy REF: 1.3 OBJ: Apply the law of the conservation of mass. (Example 1.1) TOP: general concepts | matter KEY: Law of Conservation of Mass MSC: general chemistry
Test Bank
General Chemistry, 10th edition
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8. A 5.77 g sample of calcium carbonate completely decomposes into calcium oxide (lime) and carbon dioxide gas when heated. If 3.23 g calcium oxide is produced, what mass of carbon dioxide must have been formed? A) 2.54 g B) 9.00 g C) 18.65 g D) 0.56 g E) 1.92 g ANS: A PTS: 1 DIF: easy OBJ: Apply the law of the conservation of mass. TOP: general concepts | matter
REF: 1.3
9. A sample of rubidium carbonate, weighing 7.00 g, requires 2.20 g of hydrogen chloride gas to completely decompose to water, rubidium chloride, and carbon dioxide gas. The total mass of water and rubidium chloride formed is 7.90 g and no hydrogen chloride or rubidium carbonate remains. According to the law of conservation of mass, what mass of carbon dioxide must have been formed? A) B) C) D) E)
1.30 g 0.90 g 8.65 g 17.10 g 3.07 g
ANS: A PTS: 1 DIF: moderate OBJ: Apply the law of the conservation of mass. TOP: general concepts | matter
REF: 1.3
10. Sodium oxide reacts with water to produce sodium hydroxide. Suppose 18.6 g of sodium oxide is combined with 33.7 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? A) The mass of sodium hydroxide produced must equal 52.3 g. B) The mass of unreacted water must equal 15.1 g. C) The mass of sodium hydroxide produced must equal 18.6 g. D) The mass of water consumed must equal 18.6 g. E) The mass of sodium hydroxide produced plus the mass of unreacted water must equal 52.3 g. ANS: E PTS: 1 DIF: difficult REF: 1.3 OBJ: Apply the law of the conservation of mass. (Example 1.1) TOP: general concepts | matter KEY: Law of Conservation of Mass MSC: general chemistry 11. After a certain chemical reaction has completed, it is found that 33.7 g of product was produced. According to the law of conservation of mass, which statement must be true? A) The total mass consumed of all reactants was 33.7 g. B) The mass consumed of each reactant was 33.7 g. C) The mass of reactants consumed depends on the number of reactants present. Test Bank
General Chemistry, 10th edition
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D) Before the reaction started, there was 33.7 g total of all reactants. E) Before the reaction started, there was 33.7 g of each reactant. ANS: A PTS: 1 DIF: difficult REF: 1.3 OBJ: Apply the law of the conservation of mass. (Example 1.1) TOP: general concepts | matter KEY: Law of Conservation of Mass MSC: general chemistry 12. The state of matter for an object that has both definite volume and definite shape is the A) gaseous state. B) solid state. C) mixed state. D) elemental state. E) liquid state. ANS: B PTS: 1 DIF: easy REF: 1.4 OBJ: Compare and contrast the three common states of matter: solid, liquid, and gas. TOP: general concepts | matter KEY: states of matter MSC: general chemistry 13. The state of matter for an object that has a definite volume but not a definite shape is the A) elemental state. B) gaseous state. C) mixed state. D) liquid state. E) solid state. ANS: D PTS: 1 DIF: easy REF: 1.4 OBJ: Compare and contrast the three common states of matter: solid, liquid, and gas. TOP: general concepts | matter KEY: states of matter MSC: general chemistry 14. Two types of pure substances are A) compounds and heterogeneous solutions. B) compounds and elements. C) elements and homogeneous solutions. D) compounds and homogeneous solutions. E) elements and heterogeneous solutions. ANS: B PTS: 1 DIF: easy REF: 1.4 OBJ: Describe the classifications of matter: elements, compounds, and mixtures (heterogeneous and homogeneous). TOP: general concepts | matter KEY: states of matter MSC: general chemistry 15. A sample that cannot be separated into two or more substances by physical means is A) a heterogeneous mixture. B) a compound. C) either a compound or an element. D) an element. E) a homogeneous mixture.
Test Bank
General Chemistry, 10th edition
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ANS: C PTS: 1 DIF: easy REF: 1.4 OBJ: Describe the classifications of matter: elements, compounds, and mixtures (heterogeneous and homogeneous). TOP: general concepts | matter KEY: states of matter MSC: general chemistry 16. A solution is a A) pure element. B) pure mixture. C) heterogeneous mixture. D) homogeneous mixture. E) pure compound. ANS: D PTS: 1 DIF: easy REF: 1.4 OBJ: Describe the classifications of matter: elements, compounds, and mixtures (heterogeneous and homogeneous). TOP: general concepts | matter KEY: states of matter MSC: general chemistry 17. Which of the following is a mixture? A) a homogeneous solution of sugar dissolved in water B) bromine (a liquid with the formula Br2) C) sucrose (table sugar: the formula is C12H22O11) D) graphite (an allotrope of carbon) E) calcium oxide (CaO or lime) ANS: A PTS: 1 DIF: easy REF: 1.4 OBJ: Describe the classifications of matter: elements, compounds, and mixtures (heterogeneous and homogeneous). TOP: general concepts | matter KEY: states of matter 18. A clear colorless liquid in an open beaker was heated to boiling. The liquid began to boil at 110°C, and as vapors escaped, the temperature of boiling gradually increased to 115°C, at which point the heating was stopped. On the basis of this information, we can say that the material in the beaker was a A) pure compound. B) homogeneous solution. C) pure substance. D) pure element. E) heterogeneous solution. ANS: B PTS: 1 DIF: moderate REF: 1.4 OBJ: Describe the classifications of matter: elements, compounds, and mixtures (heterogeneous and homogeneous). TOP: general concepts | matter KEY: states of matter MSC: general chemistry 19. Heating a certain pure solid completely decomposes it into a solid and a gas, each of which is also a pure substance. Which of the following is/are reasonable conclusions regarding these observations? 1. 2.
The solid is a compound and the gas is an element. At least one of the products is an element.
Test Bank
General Chemistry, 10th edition
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3.
The original solid is not an element.
A) 1 only B) 2 only C) 3 only D) 1 and 2 E) 1, 2, and 3 ANS: C PTS: 1 DIF: easy REF: 1.4 OBJ: Describe the classifications of matter: elements, compounds, and mixtures (heterogeneous and homogeneous). TOP: general concepts | matter 20. All of the following are examples of mixtures except A) supermarket salt. B) distilled water. C) soft water. D) hard water. E) drugstore hydrogen peroxide. ANS: B PTS: 1 DIF: moderate REF: 1.4 OBJ: Describe the classifications of matter: elements, compounds, and mixtures (heterogeneous and homogeneous). TOP: general concepts | matter KEY: states of matter MSC: general chemistry 21. All of the following are homogeneous mixtures except A) sodium chloride and potassium chloride. B) hydrogen gas and chlorine gas. C) sodium chloride and potassium chloride solution. D) mercury-zinc solution. E) hydrochloric acid solution. ANS: A PTS: 1 DIF: moderate REF: 1.4 OBJ: Describe the classifications of matter: elements, compounds, and mixtures (heterogeneous and homogeneous). TOP: general concepts | matter KEY: states of matter MSC: general chemistry 22. Which of the following is a homogeneous mixture? A) gasoline B) vegetable oil and water C) sugar dissolved in water D) A and C E) A, B, and C ANS: D PTS: 1 DIF: moderate REF: 1.4 OBJ: Describe the classifications of matter: elements, compounds, and mixtures (heterogeneous and homogeneous). TOP: general concepts | matter KEY: states of matter MSC: general chemistry 23. Which of the following statements is not correct? A) The combustion of methane (a component of natural gas) is a chemical change. Test Bank
General Chemistry, 10th edition
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