Post on 05-Jan-2016
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