Properties of Matter Flashcards
What is the specific heat capacity?
The Specific heat capacity of a material is the amount of heat energy needed to raise the temperature of 1kg of material by 1°C.
Letter ‘c’ is used for specific heat capacity
How do you find the specific heat capacity ‘c’ of a material in an exam?
Data booklet
(Specific Heat Capacity)
Formula for heat energy?
Eh = cm🔺️T
Eh - heat energy (J)
c - specific heat capacity (J/kg°C)
m - mass (kg)
🔺️T - change in temperature (°C)
(Specific Heat Capacity)
When does a meterial take heat energy in?
Heating up
(Specific Heat Capacity)
When does a material give heat energy out?
Cooling down
What is pressure?
Pressure is force divided by area
P=F/A
Pressure is the force acting on an area?
Formula for calculating weight
W=mg
g= 9.8N
What happens to pressure if surface area is large/small
If the surface has a small area then pressure is large.
If the surface area is larger, then pressure is lower.
What happens to a material if it is heating up/ cooling down
Heating up = heat energy in
Cooling down = heat energy out
latent Heat
Latent heat is the amount of heat energy required to change the state of 1kg of a material from liquid to a gas.
Specific latent Heat
Specific latent heat is the amount of (heat) energy required to change the state of 1kg of material.
Types of specific latent heat
Soecific latent heat of fusion = solid to liquid
And
Specific latent Heat of vaporisation = liquid to gas
Specific latent heat of fusion
The Specific Latent Heat of fusion is the amount of heat energy needed to change 1kg of solid into 1kg of liquid without a change in temperature.
When a solid is changing state into a liquid, heat energy is taken in. During this time, TEMPERATURE DOES1 NOT CHANGE. The energy taken in is called latent heat.
If the liquid solidifies back into a solid the latent heat is given out.
Specific latent heat of vaporisation
The Specific Latent Heat of vaporisation is the amount of heat energy needed to change 1kg of liquid into 1kg of gas without change in temperature.
When a liquid is changing state into a gas, heat energy is taken in to break the chemical bonds in the liquid.
During this time the TEMPERATURE STAYS THE SAME.
The energy taken out is called latent heat. If the gas condenses back into a liquid the latent heat is given back out.
Specific heat capacity
The Specific heat capacity of a material is:
The amount of heat energy required to raise the temperature of 1kg of the material by 1°C.
‘c’ is symbol. Units are J/kg°C
