ENEGY MATTERS; Heat In The Home

Question 0

What is temperature?

Answer 0

A measure of how hot a substance is measured in degrees Celsius,

Question 1

What is heat?

Answer 1

An energy form measured in joules.

Question 2

Heat always moves from a _____ substance to a ______ substance.

Answer 2

Hotter to colder.

Question 3

Give the three ways in which heat can move?

Answer 3

Conduction, convection and radiation.

Question 4

Heat is the transfer if heat in _____ materials.

Answer 4

Solid

Question 5

What is conduction?

Answer 5

Particles in a solid vibrate, passing heat from particle to particle.

Question 6

Materials which allow heat to move easily thorough them are called…. And those who do not are good

Answer 6

Conductors and insulators.

Question 7

Convection occurred in

Answer 7

Liquids and gases

Question 8

What is convection?

Answer 8

Heated fluid that is less dense than cold fluids rises so cold fluid falls to take its place. (Convention current)

Question 9

What is radiation?

Answer 9

Infrared rays .

Question 10

What type of material gives out radiation?

Answer 10

All hot materials?

Question 11

What is the only material that can travel through a vacuum?

Answer 11

Radiation eg sun to earht

Question 12

How to reduce conduction heat loss in the home

Answer 12

Loft insulation, double glazing (vacuum), carpets

Question 13

How to reduce convection heat loss in the home

Answer 13

Stop draughts, special foam in walls

Question 14

How to reduce radiation heat loss in the home

Answer 14

Foil baked radiators

Question 15

The amount of heat energy needed to heat an object relies on..

Answer 15

the temperature rise, the mass of the object,

Question 16

Amount of heat loss in homes depend on the temperature _____ compared to the temperature ______.

Answer 16

Outside inside.

Question 17

What is specific heat capacity?

Answer 17

The amount of energy required to change 1kg of a substance by 1 degree Celsius,

Question 18

What is the units of specific heat capacity?

Answer 18

Joules per kilogram per degrees Celsius or J/kg/*C

Question 19

Energy required is equal to

Answer 19

Specific heat capacity x mass x change in temperature

Question 20

During a change in state does the temperature of a material change?

Answer 20

Nooooooooo

Question 21

what is the principal of conservation of energy?

Answer 21

Although energy changes to deferent forms no energy is ever gained or lost

Question 22

Why will some heat energy be transferred to its surroundings?

Answer 22

Due to convection, conduction and radiation

Question 23

What is latent heating of vaporisation?

Answer 23

The amount of energy required to change 1kg of a liquid at its boiling point to 1kg of gas without a change in temperature.

Question 24

What does the word latent )hidden) refer to?

Answer 24

The fact that the temperature does not rise mad the heat energy supplied seems to have disspaesred

Question 25

What is specific latent heat of fusion?

Answer 25

The enrergy required to change 1kg from a solid at its melting point to 1kg of its liquid without a change in temperature.

Question 26

What happens to energy when a substance is changed from solid to liquid or liquid to gas?

Answer 26

It is absorbed

Question 27

What happens to energy when a substance changes state from gas to liquid or liquid to solid

Answer 27

Latent heat is released

Question 28

What is the unit for latent heat and what is it measured in

Answer 28

l and J/kg

Question 29

Energy needed to change state =

Answer 29

Mass x specific latent hea

Question 30

Why do you feel cold when water evaporates from your skin?

Answer 30

For the water to e parts it requires energy chip it takes form your skin

Question 31

Unit of measurement for..
Energy absorbed or lost by substance, EH
Specific heat capacity, c
Change in temperature, delta T

Answer 31

Unit of measurement for..
EH joules (J)
c joules/kilogram/degrees c (J/kg/C)
delta T, degrees Celsius

Question 32

What is specific latent heat of fusion or vaporisation, l, measured in?

Answer 32

Joules per kg (J/kg)