Chapter 20 - Materials

Question 1

What is matter?

Answer 1

Anything that occupies space and has a mass.

Question 3

Describe the properties of a solid (3)

Answer 3

1. Definite Shape (unless heated or changed by a force)
2. Definite Volume (almost incompressible)
3. Do not Flow (over a surface)

Question 4

Describe the properties of a liquid (3)

Answer 4

1. No Definite Shape (adapt to the container)
2. Definite Volume (almost incompressible)
3. Flow and Evaporate (spread over a surface and change to vapour)

Question 5

Describe the properties of gasses (3)

Answer 5

1. No Definite Shape (take up shape of container)
2. No Definite Volume (spread in all directions - diffusion)
3. Easily Compressed (can be compressed into a smaller volume)

Question 6

Describe the particles of a solid (3)

Answer 6

1. Arranged in a regular way (cannot move)
2. Packed closely together (cannot flow)
3. Strong forces between particles (hold together)

Question 7

Describe the particles of a liquid (3)

Answer 7

1. No regular arrangement (no shape of its own)
2. Slide over each other (can flow)
3. Weaker forces (more freedom of movement)

Question 8

What is diffusion?

Answer 8

The movement of particles to spread out and fill all available space.
Gasses: Quickly
Liquids and Solids: Slower

Question 9

What is the melting point?

Answer 9

The temperature at which a solid changes to a liquid.

Question 10

What is evaporation?

Answer 10

The changing of a liquid to a gas

Question 11

What is the boiling point?

Answer 11

The temperature at which a a liquid changes to a gas throughout the liquid.

Question 12

What is condensation?

Answer 12

The changing of a gas to a liquid

Question 13

Describe the particles of a gas (3)

Answer 13

1. Arranged much farther apart
2. Move quickly into all available space
3. Weak forces between particles