P2.2.4 - Energy transfer: particles

Question 1

Explain what happens when a solid object conducts thermal energy?

Answer 1

The particles of the solid collide with nearby particles.

This causes thermal energy ot be transferred throughout the object

Question 2

By what method is thermal energy mainly transferred in a liquid and a gas?

Answer 2

Convection

Question 3

Materials that do not transfer heat very well via conduction are called…

Answer 3

insulators.

Question 4

Describe what happens in a convection current.

Answer 4

1. Particles are heated
2. Particles expand (move apart) and become less dense
3. Less dense particles rise
4. Particles cool
5. Particles contract (move closer) and become more dense
6. Particles fall.
7. The cycle repeats.

Question 5

What is meant by thermal energy transfer?

Answer 5

The movement of heat from one area to another

Question 6

Which state is the best at transferring energy via conduction?

Answer 6

Solids

Question 7

Which states are poor at transferring thermal energy via conduction?

Answer 7

Liquids

Gases

Question 8

Why are gases very poor at transferring thermal energy via conduction?

Answer 8

The particles are far apart so do not often collide to transfer the energy.

Question 9

Which type of solids are the best at conduction?

Answer 9

Metals

Question 10

What are the 3 methods by which heat can be transferred?

Answer 10

Conduction

Convection

Radiation