TEST BANK For General Chemistry The Essential Concept 7Th Edition Raymond By Chang - All Chapters Complete Newest Version Instant PDF DOWNLOAD

,Chapter 01: Introduction
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1. A tentative explanation for a set of observations that can be tested by furth
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er experimentation is referred to as
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A) a hypothesis. B) a law. C) a theory.
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D) none of the above. Ans: A
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Section: 1.2 @




2. A concise verbal or mathematical statement of a relationship between phenomena that
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is always the same under the same conditions is referred to as
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A) a hypothesis. B) a law. C) a theory.
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D) none of the above. Ans: B
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Section: 1.2 @




3. A unifying principle that explains a body of facts and relations is referred to as
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A) a hypothesis. B) a law. C) a theory.
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D) none of the above. Ans: C
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Section: 1.2 @




4. Complete the following sentence. A hypothesis is
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A) a tentative explanation for a set of observations that can be tested by furth
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er experimentation.
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B) a statement describing a relationship between phenomena that is always the sam
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e under the same conditions.
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C) a unifying principle that explains a body of facts and relations.
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D) a model used to visualize the invisible
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. Ans: A Category: Easy Section: 1.2
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5. Complete the following sentence. A scientific law is
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A) a tentative explanation for a set of observations that can be tested by furth
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er experimentation.
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B) a statement describing a relationship between phenomena that is always the sam
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e under the same conditions.
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C) a unifying principle that explains a body of facts and relations.
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D) a model used to visualize the invisible
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. Ans: B Category: Easy Section: 1.2
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6. Complete the following sentence. A theory is
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A) a tentative explanation for a set of observations that can be tested by furth
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er experimentation.
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B) a statement describing a relationship between phenomena that is always the sam
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e under the same conditions.
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C) a unifying principle that explains a body of facts and relations.
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D) a model used to visualize the invisible
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. Ans: C Category: Easy Section: 1.2
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, Chapter 01: Introduction @ @




7. Choose the response that includes all the items listed below that are pure substances.
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i. orange juice ii. steam iii. ocean water iv. oxygen v. vegetable soup
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A) i, iii, v B) ii, iv C) i, iii, iv D) iv only
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E) all of them are pure Ans: B @ Category: Easy
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Section: 1.2 @




8. Which of the following is an example of a physical property?
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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 C
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Ans: E Category: Easy Section: 1.4
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9. Which one of the following is an example of a physical property?
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A) dynamite explodes D) ice floats on top of liquid water
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B) meat rots if it is not refrigerated
@ E) a silver platter tarnishes
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C) gasoline burns @


Ans: D Category: Easy Section: 1.4
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10. Which one of the following represents a physical change?
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A) water, when heated to 100 C, forms steam
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B) bleach turns hair yellow @ @ @


C) sugar, when heated, becomes brown @ @ @ @


D) milk turns sour @ @


E) apples, when exposed to air, turn brow @ @ @ @ @ @


n Ans: A Category: Easy Section: 1.4
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11. All of the following are properties of sodium. Which one is a physical property
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of sodium?
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A) It is a surface turns black when first exposed to air.
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B) It is a solid at 25 C and changes to a liquid when heated to 98 C.
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C) When placed in water it sizzles and a gas is formed.
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D) When placed in contact with chlorine it forms a compound that melts at 801 C.
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E) Sodium is never found as the pure metal in natur
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e. Ans: B Category: Easy Section: 1.4
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12. All of the following are properties of tin. Which one is a chemical property of tin?
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A) Tin can be hammered into a thin sheet.
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B) At –40 C a sheet of tin crumbles to a gray powder.
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C) Tin melts at 231.9 C. @ @ @


D) When a bar of tin is bent, it emits an audible ―cry‖.
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E) Tin erodes when added to hydrochloric acid, and a clear gas form
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s. Ans: E Category: Medium Section: 1.4
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, Chapter 01: Introduction
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13. Which one of the following represents a chemical change?
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A) boiling water to form steam @ @ @ @


B) burning a piece of coal @ @ @ @


C) heating lead until it melts @ @ @ @


D) mixing iron filings and sand at room temperature
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E) breaking glass @


Ans: B Category: Medium Section: 1.4
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14. Which of the following does not represent a chemical change?
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A) a freshly cut apple turns brown
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B) milk turns sour on standing at room temperature
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C) when cooled to 0 C, liquid water becomes ice
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D) frying an egg @ @


E) fermentation of sugar to alcohol A @ @ @ @ @


ns: C Category: Easy
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15. The SI prefixes nano and deci represent, respectively:
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A) 10– 9 and 10– 6. @ @ D) 109 and 10– 6.
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B) 106 and 10– 3. @ @ E) 10– 9 and 10– 1.
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3 –3
C) 10 and 10 . @ @ @


Ans: E Category: Easy Section: 1.7
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16. The SI prefixes milli and mega represent, respectively:
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A) 106 and 10– 6. @ @ D) 10– 3 and 109.
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–3
B) 10 and 10 . 6
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C) 103 and 10– 6. @ @ @


Ans: B Category: Easy Section: 1.7
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17. The SI prefixes kilo and centi represent, respectively:
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A) 103 and 10– 2. @ @ D) 10– 6 and 102.
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B) 106 and 10– 1. @ @ E) 102 and 10– 3.
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–3 –2
C) 10 and 10 . @ @ @ @


Ans: A Category: Easy Section: 1.7
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18. A nanometer corresponds to:
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A) 10– 2 meters. @ @ D) 10– 9 meters.
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B) 10– 3 meters. @ @ E) 10– 12 meters.
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–6
C) 10 meters. @ @


Ans: D Category: Easy Section: 1.7
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19. A microliter corresponds to:
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A) 10– 2 liters. B) 10– 3 liters. C) 10– 6 liters. D) 10– 9 liters. E) 10–
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12
@ liters. Ans: C Category: Easy Section: 1.7
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