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 liquid, solid or gas?

Answer 2

It contracts

Question 3

Air

Answer 3

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

Question 4

Layers

Answer 4

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 5

Winds are formed by convection

Answer 5

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
The movement of the air cause wind/ air currents
Air currents are sometimes called convection currents

Question 6

Radiation

Answer 6

Radiation is the transfer of heat from a hot object without the need of a medium

The sun transfers it’s energy by radiation

Question 7

Temperature

Answer 7

A measure how hot an object is

Question 8

Thermometer

Answer 8

The liquid in a thermometer will expand and rise when heated and will contract and fall when cooled it is measured between o and 100 degrees Celsius

Question 9

Boiling & freezing Points of water

Boiling point:

Answer 9

100°C

Question 10

Freezing point:

Answer 10

0°

Question 11

Melting point:

Answer 11

Is when a solid turns into a liquid

Question 12

Boiling point

Answer 12

Is when a liquid turns into gas

Question 13

Freezing point

Answer 13

Is when a liquid turns to a solid

Question 14

Condensation

Answer 14

Is a gas turning to a liquid

Question 15

Evaporation

Answer 15

Is when a liquid turns to a gas

Question 16

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

Answer 16

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

Question 17

Latent heat:

Answer 17

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

Question 18

Latent heat of fusion

Answer 18

Is used when a solid changes into a liquid

Question 19

Latent heat of vaporisation

Answer 19

Is used when a liquid changes to a gas

Question 20

Dull, black surface radiates:

Answer 20

Heat better than a shiny surface

Question 21

Dull, back surface absorb:

Answer 21

Heat better than a shiny surface

Question 22

When water is below 4°

Answer 22

It begins to expand

Question 23

The amount of heat in a substance depends on

Answer 23

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