Heat

Question 1

Heat

Answer 1

Is a form of energy

Question 2

Bimetallic strip

Answer 2

It shows that not all metals expand at the same rate, change e.g. Thermostats in heating or an iron

Question 3

Solid liquids and gases expand

Answer 3

When heated

Question 4

Solids and gases contract

Answer 4

When cooled

Question 5

The unit of energy

Answer 5

Joule (j)

Question 6

Conduction

Answer 6

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

Question 7

Water

Answer 7

Water begins to expand when cooled below 4 degrees Celsius.

Question 8

Convection

Answer 8

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

Question 9

Radiation

Answer 9

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 10

Conductor

Answer 10

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

Question 11

Insulator

Answer 11

Is a substance that doesn’t allow heat to flow through it easily e.g. Plastic.

Question 12

Air

Answer 12

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

Question 13

Layers

Answer 13

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 14

Temperature

Answer 14

A measure how hot an object is.

Question 15

Temperature is measured:

Answer 15

With a thermometer

Question 16

Liquid in the thermometer:

Answer 16

Will expand and rise when heated and will contract and fall when cooled.

Question 17

Temperature is measured

Answer 17

Between 0 and 100 degrees.

Question 18

Melting point

Answer 18

Is when a solid turns to a liquid

Question 19

Boiling point

Answer 19

Is when a liquid turns to a gas

Question 20

Freezing point

Answer 20

Is when a liquid turns to a solid

Question 21

Condensation

Answer 21

Is gas turning to a liquid

Question 22

Latent heat

Answer 22

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

Question 23

Latent heat of fusion

Answer 23

Is used when a solid changes into a liquid

Question 24

Latent heat of vaporisation

Answer 24

Is used when a liquid changes to a gas.

Question 25

Radiation can

Answer 25

A dull black surface radiates and absorbs heat better than a shiny silver surface.

Question 26

Low pressure

Answer 26

Slower a the boiling point

Question 27

High pressure

Answer 27

Raises the boiling point