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SHC and SLH

Fourth form revision stack

QuestionAnswer
What is specific heat capacity? The energy needed to change the temperature of 1kg of something by 1 degree without a change of state.
What is specific latent heat? The energy needed for 1 kg of substance to change state without a change in temperature.
Units of specific heat capacity? Joules per kg per degree Celsius.
Units of specific latent heat? Joules per kg
What is another word for melting? Fusion
What does condensation mean? Change from gas (or vapour) to liquid.
What does sublimate mean? Change from solid to gas.
Name two ways liquids change to gases. Boil and evaporate
Why does a boiling liquid have bubbles but an evaporating one does not? Evaporation just from surface, boiling all through liquid.
Name three ways to increase rate of evaporation of some water. Larger area, breeze, higher temperature.
What happens to KE of molecules when temperature rises? The KE increases.
Why do molecules need energy for a liquid to vapourise? Bonds between molecules in the liquid need to be broken.
What does a horizontal section of a cooling curve show? steady temperature, probably change of state
What is Melting Point? Temperature when solid turns to liquid.
What is Freezing Point? Temperature when liquid turns to solid.
Specific Latent Heat of fusion of a metal is 200 kJ per kg. How much energy is given out when 3 kg solidifies at 150 degC? 600kilojoules (600 000 joules)
Specific Heat Capacity of a liquid is 3000 J per kg per deg C. How much heat energy is needed to warm 2 kg by 3 deg? 18 000 joules (18 kJ)
At any temperature, a liquid has a mixture of fast and slow molecules. Which ones are most likely to escape by evaporation? Fast ones
If the average KE of the molecules in a liquid goes down, what happens to the temperature? It falls, liquid cools.
What does KE stand for? Kinetic Energy
Created by: waslancing
 

 



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