1. A tentative explanation for a set of observations that can be tested by further

Page 1

Chapter 01: Introduction

• A tentative explanation for a set of observations that can be tested by further

experimentation is referred to as

• a hypothesis. B) a law. C) a theory. D) none of the above.

Ans: A Category: Easy Section: 1.2

• A concise verbal or mathematical statement of a relationship between phenomena that is

always the same under the same conditions is referred to as

• a hypothesis. B) a law. C) a theory. D) none of the above.

Ans: B Category: Easy Section: 1.2

• A unifying principle that explains a body of facts and relations is referred to as
• a hypothesis. B) a law. C) a theory. D) none of the above.

Ans: C Category: Easy Section: 1.2

• Complete the following sentence. A hypothesis is
• a tentative explanation for a set of observations that can be tested by further

experimentation.

• a statement describing a relationship between phenomena that is always the same

under the same conditions.

• a unifying principle that explains a body of facts and relations.
• a model used to visualize the invisible.

Ans: A Category: Easy Section: 1.2

• Complete the following sentence. A scientific law is
• a tentative explanation for a set of observations that can be tested by further

experimentation.

• a statement describing a relationship between phenomena that is always the same

under the same conditions.

• a unifying principle that explains a body of facts and relations.
• a model used to visualize the invisible.

Ans: B Category: Easy Section: 1.2

• Complete the following sentence. A theory is
• a tentative explanation for a set of observations that can be tested by further

experimentation.

• a statement describing a relationship between phenomena that is always the same

under the same conditions.

• a unifying principle that explains a body of facts and relations.
• a model used to visualize the invisible.

Ans: C Category: Easy Section: 1.2

(General Chemistry The Essential Concepts, 7e Raymond Chang, Kenneth Goldsby) (Test Bank all Chapter) 1 / 4

Chapter 01: Introduction

Page 2

• Choose the response that includes all the items listed below that are pure substances.
• orange juice ii. steam iii. ocean water iv. oxygen v. vegetable soup
• i, iii, v B) ii, iv C) i, iii, iv D) iv only E) all of them are pure

Ans: B Category: Easy Section: 1.2

• Which of the following is an example of a physical property?
• corrosiveness of sulfuric acid
• toxicity of cyanide
• flammability of gasoline
• neutralization of stomach acid with an antacid
• lead becomes a liquid when heated to 601C

Ans: E Category: Easy Section: 1.4

• Which one of the following is an example of a physical property?
• dynamite explodes D) ice floats on top of liquid water
• meat rots if it is not refrigerated E) a silver platter tarnishes
• gasoline burns

Ans: D Category: Easy Section: 1.4

• Which one of the following represents a physical change?
• water, when heated to 100C, forms steam
• bleach turns hair yellow
• sugar, when heated, becomes brown
• milk turns sour
• apples, when exposed to air, turn brown

Ans: A Category: Easy Section: 1.4

• All of the following are properties of sodium. Which one is a physical property of

sodium?

• It is a surface turns black when first exposed to air.
• It is a solid at 25C and changes to a liquid when heated to 98C.
• When placed in water it sizzles and a gas is formed.
• When placed in contact with chlorine it forms a compound that melts at 801C.
• Sodium is never found as the pure metal in nature.

Ans: B Category: Easy Section: 1.4

• All of the following are properties of tin. Which one is a chemical property of tin?
• Tin can be hammered into a thin sheet.
• At –40C a sheet of tin crumbles to a gray powder.
• Tin melts at 231.9C.
• When a bar of tin is bent, it emits an audible “cry”.
• Tin erodes when added to hydrochloric acid, and a clear gas forms.

Ans: E Category: Medium Section: 1.4

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Chapter 01: Introduction

Page 3

• Which one of the following represents a chemical change?
• boiling water to form steam
• burning a piece of coal
• heating lead until it melts
• mixing iron filings and sand at room temperature
• breaking glass

Ans: B Category: Medium Section: 1.4

• Which of the following does not represent a chemical change?
• a freshly cut apple turns brown
• milk turns sour on standing at room temperature
• when cooled to 0C, liquid water becomes ice
• frying an egg
• fermentation of sugar to alcohol

Ans: C Category: Easy Section: 1.4

15. The SI prefixes nano and deci represent, respectively:

• 10

– 9 and 10 – 6

. D) 10

9 and 10 – 6 .

• 10

6 and 10 – 3

. E) 10

– 9 and 10 – 1 .

• 10

3 and 10 – 3 .Ans: E Category: Easy Section: 1.7

16. The SI prefixes milli and mega represent, respectively:

• 10

6 and 10 – 6

. D) 10

– 3 and 10 9 .

• 10

– 3 and 10 6

. E) 10

– 6 and 10 – 3 .

• 10

3 and 10 – 6 .Ans: B Category: Easy Section: 1.7

17. The SI prefixes kilo and centi represent, respectively:

• 10

3 and 10 – 2

. D) 10

– 6 and 10 2 .

• 10

6 and 10 – 1

. E) 10

2 and 10 – 3 .

• 10

– 3 and 10 – 2 .Ans: A Category: Easy Section: 1.7

18. A nanometer corresponds to:

• 10

– 2 meters. D) 10 – 9 meters.

• 10

– 3 meters. E) 10

– 12

meters.

• 10

– 6 meters.Ans: D Category: Easy Section: 1.7

19. A microliter corresponds to:

A) 10

– 2 liters. B) 10 – 3 liters. C) 10 – 6 liters. D) 10 – 9 liters. E) 10

– 12

liters.Ans: C Category: Easy Section: 1.7

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Chapter 01: Introduction

Page 4

• 6.0 km is how many micrometers?

A) 6.0  10

6 µm D) 1.7  10 – 4 µm

B) 1.7  10

– 7 µm E) 6.0  10 3 µm

C) 6.0  10

9 µm Ans: C Category: Medium Section: 1.7

• 2.4 km is how many millimeters?
• 2,400 mm D) 2.4  10

6 mm

B) 2.4  10

4 mm E) 2.4  10 – 5 mm

C) 2.4  10

5 mm Ans: D Category: Medium Section: 1.7

• How many milliliters is 0.005 L?
• 0.5 mL B) 5 mL C) 0.50 mL D) 0.000005 mL E) 200 mL

Ans: B Category: Medium Section: 1.7

• Express 7,500 nm as picometers.
• 7.50 pm B) 75.0 pm C) 750 pm D) 7.5  10

6 pm E) 7.5  10 12 pm Ans: D Category: Medium Section: 1.7

• The diameter of Earth is 12.7 Mm. Express this diameter in centimeters.

A) 1.27  10

5 cm D) 1.27  10 8 cm

B) 1.27  10

6 cm E) 1.27  10 9 cm

C) 1.27  10

7 cm Ans: E Category: Medium Section: 1.7

• In 1828, the diameter of the U.S. dime was changed to approximately 18 mm. What is

this diameter when expressed in nanometers?

A) 1.8  10

9 nm D) 1.8  10 – 5 nm

B) 1.8  10

7 nm E) 1.8  10

– 10

nm

C) 1.8  10

1 nm Ans: B Category: Medium Section: 1.7

• Which of the following represents the largest mass?

A) 2.0  10

2 mg D) 2.0  10 2 cg

• 0.0010 kg E) 10.0 dg

C) 1.0  10

5 ng Ans: D Category: Medium Section: 1.7

• Lead melts at 601.0C. What temperature is this in

o F?

A) 302F B) 365F C) 1,050F D) 1,082F E) 1,114F

Ans: E Category: Medium Section: 1.7

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