Heat🔥

Question 1

What is conduction?

Answer 1

When heat energy is passed onto particles by vibrations as its energy gives the particles kinetic energy to move around and bump into each other

Question 2

What is heat?

Answer 2

A form of energy. When particles are given more energy, they move around more. Their kinetic energy can be used as heat energy

Question 3

What does the amount of heat energy does something rely on?

Answer 3

The volume/size, the temperature

Question 4

How does heat energy transfer?

Answer 4

From the hot end to the cold particles around it until everything eventually becomes the same temperature (Rm temp: 23°?)

Question 5

What has more heat energy?
A: 50ml of 50°C water
B: 25ml of 50°C water

Answer 5

A - because there are more particles with heat energy. They are the same temperature but A has more particles

Question 6

What would take longer to heat up?
A: 100ml
B: 20ml

Answer 6

A - there are more particles for the heat energy to be passed on

Question 7

What are conductors?

Answer 7

Allow heat energy to pass through

Question 8

What are insulators?

Answer 8

Do not allow heat to pass through very well

Question 9

What state of matter does conduction work best in?

Answer 9

Solids - the particles are closer together and in rows meaning it is easier for the energy to be passed onto the next one by bumping

Question 10

What is a convection current?

Answer 10

When a dense area is heated, it rises and becomes less dense as the heat gives the particles energy to move around more and break shape. When it reaches the top, it cools down and sinks back down as it becomes dense again

Question 11

Why can’t convection happen in solids?

Answer 11

Because the particles are in a fixed position and can’t move around without changing state

Question 12

What states of matter can convection happen in?

Answer 12

Gas and liquid - the particles are not in fixed in positions and can move around

Question 13

What is a fluid?

Answer 13

Liquids and gases - where the particles can flow and move around

Question 14

Why is conduction difficult in gases?

Answer 14

Because the particles are spread out and further away from each other and move around in random directions. This makes it harder for the heat energy to be passed onto each other by touching

Question 15

What are some ways of insulating a house?

Answer 15

Double glazed windows, loft insulation, chimneys, curtains

Question 16

How does using double glazed Windows help reduce conduction and convection?

Answer 16

There is a small gap of air in between the two layers of glass. Once the heat gets through the first layer of glass since it is unite a good conductor, it can’t get through the gap of air as well. This is because heat doesn’t travel in gases as well since the particles move on random directions making it harder for the particles to collide

Question 17

How do chimneys help lose heat?

Answer 17

Hot air rises in convection because hot air is less dense than cold air. This is because the particles are given energy to move around and the bonds get bigger so the particles get further away from each other. This means that the hot air can escape through the chimney as its high

Question 18

How does loft insulation help reduce conduction?

Answer 18

The insulation is made from foam which has air pockets making conduction harder to happen

Question 19

What is radiation?

Answer 19

Refers to infrared radiation. Heat can be transferred as a wave from one substance to its surroundings. All materials can absorb or emit radiation. It doesn’t need particles

Question 20

What coloured material can absorb and emit radiation best?

Answer 20

Black, matt colours. Shiny materials are the worst as they reflect the heat

Question 21

What is temperature

Answer 21

How hot or cold somethings