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 solid, liquid or gas

Answer 2

It contracts

Question 3

Heat transfer

Answer 3

Heat is transferred by three methods

1. Convection
2. Conduction
3. 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

Something that allows energy eg. heat to flow through it eg. metal is a good conductor

Question 8

Insulator

Answer 8

An insulator is a substance that doesn’t allow heat to flow through it easily eg. Plastic

Question 9

To show that a solid expands when we heat it 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 animal

Question 12

Layers

Answer 12

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

Question 13

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 the thermometer will expand and rise when heated and will contact and fall when cooled.

Question 16

Boiling point of water (steam point)

Answer 16

100°C

Question 17

Freezing point of water(ice point)

Answer 17

0°C

Question 18

Melting point

Answer 18

When a solid turns to liquid

Question 19

Boiling point

Answer 19

When a liquid turns to gas

Question 20

Freezing point

Answer 20

When a liquid turns to a solid

Question 21

Condensation

Answer 21

Is a gas turning to a liquid

Question 22

Evaporation

Answer 22

Is when a liquid turns to a gas

Question 23

Pressure & boiling point: A kettle will normally boil at 100°C, but will boil at 70°C on top of mt. Everest

Answer 23

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

Question 24

Latent heat

Answer 24

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

Question 25

Latent heat of fusion

Answer 25

Used when a solid changes into a liquid

Question 26

Latent heat of vaporisation

Answer 26

Is used when a liquid changes to a gas

Question 27

Dull, black surface radiates

Answer 27

Heat better than a shiny surface

Question 28

Dull, black surface absorb

Answer 28

Heat better than a shiny surface

Question 29

When water is below 4°C

Answer 29

It begins to expand

Question 30

The amount of heat in a substance depends on

Answer 30

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 at 60°C