Temperature and Heat Energy

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Temperature and Heat

Energy

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gy

How are temperature and

heat energy different?  The liquids in these 2 beakers are at the same

temperature, so the particles have the same

average speed

! litre 2 litres

" #

  2 #eakers of water

at $%&' are at the

same temperature but

if one is twice as bigas the other, it will

contain twice as much

heat energy as the

other

$%&'

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 To heat both liquids by the

same amount, the liquid in

beaker # must be giventwice as much energy as

the liquid in beaker "

This increases the average speed of theparticles in each liquid by the same amount

Energy is measuredin (oules )*+! litre 2 litres

" #

armer 

-2,%%%* .-%%%*

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hich will contain more

heat energy?

! litre 2 litres

" #

$%&'

"nswer / #

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hich will contain more

heat energy

! litre

"

! litre

#

02&' !2&'

"nswer / "

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hat happens when we

mi1 hot and cold?  f we mi1 together 2 beakers with the same

volume of water at different temperatures,

the mi1ture will be at an average of the 2

temperatures

!    %   &    '   

   2   %   &   '

!$&'

 !% 3 2% 4 !$&'

  2

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How much heat is needed?

  How much the temperature of

a material is changed by heat

energy depends on 5

! hat the material is

2 How much of it there is

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How much of it there is

  Twice as much water needs twice as

much energy to raise its

temperature by the same amount

  f it takes -%%%* of energy to warm

up !%%ml of water by !%&', it willtake .%%%* to warm up 2%%ml of

water by !%&'

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hat the material is

  To warm up !kg of water by !&',

it takes -2%%* of energy

  To warm up !kg of aluminium by

!&', it takes ..%* of energy

  t takes more energy to get the

water particles vibrating fasterbecause they are further apart