Heat

Question 1

some examples of thermal conductors are:

Answer 1

silver, iron, gold, aluminium, copper

Question 2

How do particles move in solids?

Answer 2

they vibrate

Question 3

How do particles move in liquids and gases?

Answer 3

they move rapidly in different directions

Question 4

what happens to a solid when it’s melted?

Answer 4

becomes a liquid

Question 5

What happens to a liquid when it’s melted?

Answer 5

turns into a gas

Question 6

what happens when a gas is condensed (condensation)?

Answer 6

becomes a liquid

Question 7

What happens when a liquid evaporates?

Answer 7

becomes a gas

Question 8

What happens when expansion occurs?

Answer 8

The space between the particles gets greater

Question 9

give examples where expansion is needed:

Answer 9

hot air balloons, railway tracks - they expand in heat

Question 10

Give some examples of thermal insulators;

Answer 10

Glass, rubber, plastic, wood

Question 11

What can heat transfer take place because of?

Answer 11

Convection

Question 12

heat transfer is due to ______ _________

Answer 12

Infra- red radiation

Question 13

Why can’t the process of conduction take place in a vacuum?

Answer 13

Because it requires particles to be present

Question 14

What colours are good and bad absorbers of infra-red radiation?

Answer 14

good - dark, matt surfaces

bad - light, shiny surfaces

Question 15

What colours are good and bad emitters of of infra-red radiation?

Answer 15

good - black, matt surfaces

bad - light, shiny surfaces

Question 16

What is conduction the process of?

Answer 16

Where heat is passed on through two neighbouring atoms/ molecules rubbing against each other

Question 17

What are the 4 different things that are used to stop heat transfer:

Answer 17

double glazing, loft insulation, cavity wall insulation, draught excluders

Question 18

:)

Answer 18

:)

Question 19

where does conduction by radiation by radiation take place (give an example)?

Answer 19

When you burn your self on a hob and use ice to cool down hand

Question 20

When does convection by radiation take place (give an example)?

Answer 20

When hot air rises and then cools so it falls to the ground

convection current

Question 21

When does thermal transfer by radiation take place (give an example)?

Answer 21

The heating of the Earth by the Sun