AQA Combined Physics 6.3 Flashcards
Revision for Paper 1
What is specific latent heat of fusion?
A change of state from solid to liquid
What does a change of state require?
Energy
What happens to the internal energy of a system when heat is applied?
Heating the system tranfers energy to the particles increasing the internal energy
What is internal energy?
The energy stored by the particles whic makes up a system
What do the horizontal lines on a heating or cooling curve represent?
A change of state
What is average energy in kinetic stores related to?
Temperature
Explain what changing the temperature of a gas at constant volume causes
Increases the pressure as the particles move faster and hit the container walls more often
What happens to the particles of a gas when temperature is increased?
The average speed of the particles increases as the energy in the particles’ kinetic energy stores is 1/2mv2
Why can work done cause a temperature increase in a gas?
Energy transferred by a force (work) transfers energy to the kinetic energy stores of the gas particles, increasing their temperature
What can a chnage in pressure cause?
A change in volume
What does the phrase: “a change of state conserves mass” mean?
When materials change state this is a physical change where the number of paricles remains the same
What is specific latent heat?
The amount of energy needed to change 1kg of the substance’s state (without changing its temperature)
What affects the density of an object?
The material it is made of and hw the particles are arranged
What is specific latent heat of vapourisation?
A change of state for liquid to vapour
After a physical change, can the material’s origina; properties be recovered?
Yes, the properties can be recovered if the change is reversed
How can internal energy be calculated?
It is the total kinetic energy and potential energy of all the particles that make up the system
What is the specific heat capacity of a substance?
The amount of energy required to raise the temperature of 1kg of teh substance by 1 degrees celcius
What are the three states of matter?
1) Solid
2) Liquid
3) Gas
List the five changes of state
1) Melting (solid to liquid)
2) Freezing (liquid to solid)
3) Sublimating (solid to gas)
4) Boiling/evaporating (liquid to gas)
5) Condensing (gas to liquid)
Give the equation that links density, mass and volume
Density = mass / volume p = m / v
