1
Q
what is the formula for specific heat capacity ?
A
Q = m x c x ∆T
m = mass of the surroundings generally water
c = specific heat capacity
∆T = temperature change
2
Q
deifine specific heat capacity
A
amount of energy required to raise 1g of water by 1 kelvin
3
Q
what is the specific heat capacity of water ?
A
4.18 Jg-1 K-1
4
Q
Describe equipment for coffee cup calorimetry?
A
- has polystyrene lid: to provide insulation and minimize heat loss
- thermometer: measures temp. change
- styrofoam cup: held in another styrofoam cup or beaker to provide further insulation
5
Q
give three sources of error that affect the value of energy transferred
A
- heat energy is lost to its surroundings - copper can, thermometer and air
- not complete combustion so the flame is yellow and not roaring blue
6
Q
what precautions do we take to prevent heat loss to the surroundings when we do this experiment in the lab ?
A
- put a lid on copper can
2.use draft excluders - copper calorimeter
