Chapter 1: Chemistry: The Study of Change

Page 1 Chapter 1: Chemistry: The Study of Change 1.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: 1.3 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: 1.3 3.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: 1.3 4.Complete the following sentence. A hypothesis 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 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: 1.3 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 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: B Category: Easy Section: 1.3 6.Complete the following sentence. A theory 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 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: C Category: Easy Section: 1.3 Chemistry 10e Ra ymond Chang (Test Bank All Chapters, 100% Original Verified, A+ Grade) 1 / 4

Chapter 1: Chemistry: The Study of Change 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: 1.3

• 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

o C Ans: E Category: Easy Section: 1.6

• 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: 1.6

• 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: 1.6

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

sodium?

• It is 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: 1.6

• 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: 1.6

• / 4

Chapter 1: Chemistry: The Study of Change 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: 1.6

• 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: 1.6

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

• / 4

Chapter 1: Chemistry: The Study of Change 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: 1.9

• 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 °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

• / 4