General Chemistry The Essential Concept 7Th Edition By Raymond Chang - Test Bank

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

2. A concise verbal or mathematical statement of a relationship between phenomena that 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. D) none of the above.
Ans: B Category: Easy Section: 1.2
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3. A unifying principle that explains a body of facts and relations is referred to as
A) a hypothesis. B) a law. C) a theory. D) none of the above.
Ans: C Category: Easy Section: 1.2
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4. Complete the following sentence. A hypothesis is
A) a tentative explanation for a set of observations that can be tested by further
experimentation.
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B) a statement describing a relationship between phenomena that is always the same
under the same conditions.
C) a unifying principle that explains a body of facts and relations.
D) a model used to visualize the invisible.
Ans: A Category: Easy Section: 1.2
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5. Complete the following sentence. A scientific law is
A) a tentative explanation for a set of observations that can be tested by further
experimentation.
B) a statement describing a relationship between phenomena that is always the same
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under the same conditions.
C) a unifying principle that explains a body of facts and relations.
D) a model used to visualize the invisible.
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Ans: B Category: Easy Section: 1.2

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 further
experimentation.
B) a statement describing a relationship between phenomena that is always the same
under the same conditions.
C) a unifying principle that explains a body of facts and relations.
D) a model used to visualize the invisible.
D
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.
i. orange juice ii. steam iii. ocean water iv. oxygen v. vegetable soup
A) i, iii, v B) ii, iv C) i, iii, iv D) iv only E) all of them are pure
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Ans: B Category: Easy Section: 1.2

8. Which of the following is an example of a physical property?
A) corrosiveness of sulfuric acid
B) toxicity of cyanide
C) flammability of gasoline
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D) neutralization of stomach acid with an antacid
E) lead becomes a liquid when heated to 601C
Ans: E Category: Easy Section: 1.4
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9. Which one of the following is an example of a physical property?
A) dynamite explodes D) ice floats on top of liquid water
B) meat rots if it is not refrigerated E) a silver platter tarnishes
C) gasoline burns
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Ans: D Category: Easy Section: 1.4
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10. Which one of the following represents a physical change?
A) water, when heated to 100C, forms steam
B) bleach turns hair yellow
C) sugar, when heated, becomes brown
D) milk turns sour
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E) apples, when exposed to air, turn brown
Ans: A Category: Easy Section: 1.4

11. All of the following are properties of sodium. Which one is a physical property of
sodium?
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.
C) When placed in water it sizzles and a gas is formed.
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 nature.
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?
A) Tin can be hammered into a thin sheet.
B) At –40C a sheet of tin crumbles to a gray powder.
C) Tin melts at 231.9C.
D) When a bar of tin is bent, it emits an audible “cry”.
E) Tin erodes when added to hydrochloric acid, and a clear gas forms.
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Ans: E Category: Medium Section: 1.4
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