1. Chapter 1 Chemistry: A Science for All Seasons James A. Noblet California State University San Bernardino, CA  2007 Prentice Hall Chemistry for Changing Times, 11 th edition John W. Hill and Doris K. Kolb

2. A key aspect of a scientific hypothesis is that it must be: 1.Creative 2.Unique 3.Testable 4.Persuasive 5.Understandable

3. A key aspect of a scientific hypothesis is that it must be: 1.Creative 2.Unique 3.Testable 4.Persuasive 5.Understandable

4. 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

5. 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

6. What quantity represents the smallest mass? 1.0.01 kg 2.1.0 g 3.100 mg 4.1000  g 5.100,000 ng

7. What quantity represents the smallest mass? 1.0.01 kg (10g) 2.1.0 g 3.100 mg (0.1g) 4.1000  g (10 -3 g) 5.100,000 ng (10 -4 g)

8. 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/cm 3 ) 5.Copper (8.94 g/cm 3 )

9. 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/cm 3 ) 5.Copper (8.94 g/cm 3 )

10. 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

11. Why? (1.0 L =1000 mL=1000 g H 2 O; 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