Ch. 2: “Matter”Ch. 2: “Matter”

Section 2.2 Review: “Matter Section 2.2 Review: “Matter & Energy”& Energy”

1. Define energy1. Define energy

Energy is the ability to change or Energy is the ability to change or move matter.move matter.

2. State the law of conservation 2. State the law of conservation of mass & the law of of mass & the law of conservation of energy .conservation of energy .

Mass cannot be created or Mass cannot be created or destroyed. Matter cannot be destroyed. Matter cannot be created or destroyed.created or destroyed.

3. List 2 examples for each 3. List 2 examples for each of the 3 common states of of the 3 common states of matter.matter. solid--marble, brasssolid--marble, brass liquid--water, mercuryliquid--water, mercury gas--oxygen, nitrogengas--oxygen, nitrogen

4. Rank the following in order 4. Rank the following in order of increasing strength of forces of increasing strength of forces between molecules.between molecules.

e. nitrogen gase. nitrogen gas c. waterc. water a. honeya. honey d. candle waxd. candle wax b. marbleb. marble

5. Compare & contrast the 5. Compare & contrast the shape & volume of solids, shape & volume of solids, liquids, & gases.liquids, & gases.

Solids have a definite volume & Solids have a definite volume & definite shape.definite shape.

Liquids have a definite volume Liquids have a definite volume but no definite shapebut no definite shape

Gases have neither a definite Gases have neither a definite volume nor a definite shape.volume nor a definite shape.

6. Predict which 2 of the following involve 6. Predict which 2 of the following involve the same energy transfer. Assume that the same energy transfer. Assume that the same substance & the same mass is the same substance & the same mass is involved in all 4 processes.involved in all 4 processes.

Evaporation & condensation are Evaporation & condensation are opposite processes that involve opposite processes that involve the same amount of energy the same amount of energy transfer.transfer.

8. Creative Thinking: Describe a 8. Creative Thinking: Describe a characteristic of gases, & use the kinetic characteristic of gases, & use the kinetic theory to explain how a dog could find you theory to explain how a dog could find you by your scent.by your scent.

Gas particles have enough energy Gas particles have enough energy to move freely in all directions. to move freely in all directions. Every time a person touches Every time a person touches something, traces that are something, traces that are characteristic of that person are left characteristic of that person are left behind. As those traces absorb behind. As those traces absorb energy and vaporize, a dog that has energy and vaporize, a dog that has a keen sense of smell can detect a keen sense of smell can detect them.them.