Science Pg19 - 23

Question 1

How is heat transferred to objects

Answer 1

By convection, conduction , and radiation

Question 2

Conduction

Answer 2

Heat moves through objects ( soilids?)

Question 3

Convection

Answer 3

Heat moves through air or water ( gas /liquid)

Question 4

Radiation

Answer 4

Heat moves through empty space

Question 5

Conduction

Answer 5

The transfer of heat through an object or from one object to another

Question 6

Conducter

Answer 6

Material that transfers heat well by conduction

Question 7

Insulators

Answer 7

Materials that don’t transfer heat well by conduction

Question 8

Why is metal a good conductor of heat

Answer 8

Because the particles are packed closely toghether

Question 9

What are poor conductors of heat called

Answer 9

Insulators

Question 10

What usally do pots and pans have on the lids/handles

Answer 10

Wood
Plastic
Teflon

Question 11

2 exp. Of good insulators

Answer 11

Styrfoam

Plastic

Question 12

Explain the transfer of heat in liquids and air

Answer 12

Convection is the transfer of heat by the movement of liquid or gas particles

Question 13

Convection

Answer 13

The transfer of heat through air or water

Question 14

Convection currents

Answer 14

Cold air sinks hot air rises

Question 15

Give Exp. Of transfer of heat through air and liquid in a line

Answer 15

HEAT FROM FIRE. HEAT IN AIR. HEAT ON YOUR SKIN.

Question 16

What happens when water heats up and why

Answer 16

When water heats up the water particles move faster and further apart. This makes the water expand and rise. This is because convection currents

Question 17

Where should you place a heater and an air-conditioning in a room and why?

Answer 17

Heater on ground (hot air rises)

Aircon on roof (cold air sinks)

Question 18

Radiation

Answer 18

The transfer of heat through empty space

Question 19

Reflectors

Answer 19

Objects and materials that reflect heat

Question 20

What type of objects reflect heat

Answer 20

Any object that is hotter than its surroundings

Question 21

Dark colours absorb heat..black

Light coulors reflect heat…white / silvery

Answer 21

True

Question 22

What are reflectors

Answer 22

Objects that reflect the heat