Chapter 1Chemistry: A Science for All

Seasons

James A. Noblet

California State University

San Bernardino, CA

2007 Prentice Hall

Chemistry for Changing Times, 11th edition

John W. Hill and Doris K. Kolb

A key aspect of a scientific hypothesis is that it must be:

1. Creative

2. Unique

3. Testable

4. Persuasive

5. Understandable

A key aspect of a scientific hypothesis is that it must be:

1. Creative

2. Unique

3. Testable

4. Persuasive

5. Understandable

Which of the following processes represents a chemical change?

1. Water freezes into ice

2. Water evaporates

3. Butter melts in a hot pan

4. A bicycle left outdoors begins to rust

5. Sugar dissolves in hot coffee

Which of the following processes represents a chemical change?

1. Water freezes into ice

2. Water evaporates

3. Butter melts in a hot pan

4. A bicycle left outdoors begins to rust

5. Sugar dissolves in hot coffee

What quantity represents the smallest mass?

1. 0.01 kg

2. 1.0 g

3. 100 mg

4. 1000 g

5. 100,000 ng

What quantity represents the smallest mass?

1. 0.01 kg (10g)

2. 1.0 g

3. 100 mg (0.1g)

4. 1000 g (10-3g)

5. 100,000 ng (10-4g)

A 10.0-g sample of which of the following substances would have the greatest volume?

1. Hexane (0.660g/mL)

2. Ethyl alcohol (0.789g/mL)

3. Water (1.00 g/mL)

4. Magnesium (1.738 g/cm3)

5. Copper (8.94 g/cm3)

A 10.0-g sample of which of the following substances would have the greatest volume?

1. Hexane (0.660g/mL)

2. Ethyl alcohol (0.789g/mL)

3. Water (1.00 g/mL)

4. Magnesium (1.738 g/cm3)

5. Copper (8.94 g/cm3)

The energy required to heat 1.0 L of water from room temperature (20ºC) to boiling is:

1. 80 calories

2. 80 kilocalories

3. 800 calories

4. 800 kilocalories

5. 8000 calories

Why? (1.0 L =1000 mL=1000 g H2O; Boiling water is 100ºC, so temp increase is 80ºC x 1000 g =80,000 cal or 80 kcal)

The energy required to heat 1.0 L of water from room temperature (20ºC) to boiling is:

1. 80 calories

2. 80 kilocalories

3. 800 calories

4. 800 kilocalories

5. 8000 calories