Heating And Cooling

Question 1

If there was a hot cup of tea what would happen to it?

Answer 1

The heat energy from the cup would move away from the cup into the air meaning the cup would cool down quicker

Question 2

What would happen to a cold glass of water?

Answer 2

Heat energy would travel towards the cold drink making it become more hotter

Question 3

What would be quickest to heat up a big volume of water or a low volume of water?

Answer 3

The low volume of water would take shorter time as it would have less particles to heat

Question 4

What is an Insulator?

Answer 4

It does not allow heat to travel through

Question 5

What is a conductor?

Answer 5

It does allow heat energy to travel through

Question 6

How does conduction work?

Answer 6

Particles vibrate and then pass the heat energy on to other particles

Question 7

What is heat?

Answer 7

A form of energy

Question 8

How does convection work?

Answer 8

When particles with a lot of heat energy move to replace the particles with less heat energy so it basically is a continuous process

Question 9

What can convection occur in?

Answer 9

Liquids or gases

Question 10

What can conduction occur in?

Answer 10

Solids

Question 11

What can radiation occur in?

Answer 11

A vacuum

Question 12

How does radiation work?

Answer 12

Radiation refers to infrared radiation. Heat can be transferred as a wave from one substance to the surroundings. Because it doesn’t need particles it travels through a vacuum. The earth is heated by the sun with infrared radiation. All materials can emit or absorb radiation.

Question 13

What releases the most infrared radiation:
Shiny silver
Dull silver
Matt black
Shiny red 

And why?

Answer 13

The order from least radiation to most radiation:
Shiny silver
Dull silver
Shiny red
Matt black
Any dull or matt materials emit more radiation then shiny objects.

Question 14

What is a fluid?

Answer 14

A fluid is something that flows. This is either a liquid or gas.

Question 15

Are fluids good conductors of heat?

Answer 15

Fluids are poor conductors of heat because they are further apart. Also the force of attraction between the particles are not as strong as those in solids. Also they move in random direction.

Question 16

Where in our home to we loose heat?

Answer 16

Roof=This is called convection as the heat rises (26%)
Walls=This is called conduction as it is travelling through a solid (33%)
Windows= This is called conduction as it is travelling through a solid (18%)
Floor= This is called conduction as it is travelling through a solid (8%)

Question 17

What are the changes of state?

Answer 17

Solid to a liquid=melting
Liquid to a gas=evaporating or boiling
Gas to a liquid=condensing
Liquid to a solid=freezing

Question 18

What is a good insulator?

Answer 18

A gas is a good insulator as the particles are more spread out which means it takes longe for the heat to escape or travel