Heat

Question 0

What happens when we heat a solid,liquid or gas?

Answer 0

It expands

Question 1

Heat.?

Answer 1

Is a form of energy.

Question 2

What happens when we cool a solid,liquid or gas?

Answer 2

It contracts (gets smaller)

Question 3

Heat transfer ?

Answer 3

Heat is transferred by 3 methods :
•Convection
•Conduction
•Radiation

Question 4

Conduction

Answer 4

Heat travels from particle to particle along a substance, normally a solid.

Question 5

Convection

Answer 5

Heat travels through a fluid (liquid or a gas) when the particles move and carry the heat.

Question 6

Radiation

Answer 6

Heat travels from a hot object without the need for a medium, does not need a solid, liquid or gas to go through, will flow through a vacuum.

Question 7

Conductor

Answer 7

Somethings that allows energy e.g. Heat to flow through it. E.g. Metal is a good conductor.

Question 8

Insulator

Answer 8

A insulator is a substance that doesn’t allow to heat to flow through it easily. E.g. Plastic .

Question 9

To show that a solid expands when heated and contracts when cooled?

Answer 9

Ball and ring apparatus .

Question 10

Water?

Answer 10

Water begins to expand when cooled below 4 degrees C

Question 11

Air?

Answer 11

Is a good insulator, keeps animals warm, is trapped by the fur and helps to insulate the animals.

Question 12

Layers?

Answer 12

The hairs on our arms are not very good at keeping us warm, if we ware layers clothes, air is trapped to keep us warm

Question 13

Winds are formed by Convection

Answer 13

The sun heats the earth. This causes hot air to rise . As the hot air rises it cools and then sinks down to the ground.

Question 14

Temperature?

Answer 14

A measure of how hot an object is.

Question 15

Thermometer

Answer 15

The liquid in a thermometer will expand and rise when heated and will contract and fall when cooled.

Question 16

Boiling and freezing points of water?

Answer 16

Boiling = 100°C

Ice =0°C

Question 17

Melting point

Answer 17

When a solid turns to a liquid

Question 18

Boiling point

Answer 18

When a liquid turns to a gas

Question 19

Freezing point?

Answer 19

When a liquid turns to a solid

Question 20

Condensation?

Answer 20

When a gas turns to a liquid

Question 21

Evaporation?

Answer 21

When a liquid turns to a gas

Question 22

A kettle will normally boil at 100°C but with boil at 70°C on top of Mt.Everest?

Answer 22

Atmospheric pressure is less so it is easier for the water vapour to escape.

Question 23

Latent heat?

Answer 23

The heat taken in or given out when a substance is changing state without a change in temperature.

Question 24

Latent heat of fusion?

Answer 24

Is used when a solid changes to a liquid

Question 25

Latent heat of vaporisation.

Answer 25

When a liquid changes to a gas

Question 26

Dull,black surface radiates?

Answer 26

Heat better than a shiny surface

Question 27

Dhll, black surface absorbs ?

Answer 27

Heat better than a shiny surface

Question 28

When water is below 4°

Answer 28

It begins to expand

Question 29

The amounts of heat in a substance depends on?

Answer 29

Temperature, mass and what it is made of e.g. 200ml of water at 60°C has twice as much heat as 100ml of water of 60°C