AQA EDUCATION A LEVEL PHYSICS PAPER 2
1. what is meant by specific heat capacity: the energy
needed to raise the
temperature of 1kg of material by 1C.
2. define avogadro's constant: the number of atoms in 12g of
carbon 12 (OR the
no. of particles/atoms in one mole of a substance)
3. define the specific latent heat of vaporisation of water:
the energy required to
change the state of a unit mass of water to gas (1) without a
change in temperature
(1)
4. features of an ideal gas (3): - collisions are elastic
- molecules have negligible volume
- gas obeys ideal gas law (Boyles law)
5. assumptions made in the molecular kinetic theory of an
ideal gas: - all
molecules are identical
- molecules in random motion
- newtonian mechanics apply
- vol of gas molecules negligible (compared to vol of gas)
- collisions are elastic
6. state and explain what happens to the speed of
molecules in a gas when
the temperature increases: the average/mean speed of
molecules increases (1)
as mean ke proportional to absolute temp
7. state what is meant by an elastic collision: a collision in
which ke is conserved
8. two different gases at the same temp have molecules
with different mean
square speeds. explain how this is possible: masses are
different (1) but because
ke same, mean square speeds must be different
9. why does the total ke of an ideal gas equal the total
internal energy of an
1. what is meant by specific heat capacity: the energy
needed to raise the
temperature of 1kg of material by 1C.
2. define avogadro's constant: the number of atoms in 12g of
carbon 12 (OR the
no. of particles/atoms in one mole of a substance)
3. define the specific latent heat of vaporisation of water:
the energy required to
change the state of a unit mass of water to gas (1) without a
change in temperature
(1)
4. features of an ideal gas (3): - collisions are elastic
- molecules have negligible volume
- gas obeys ideal gas law (Boyles law)
5. assumptions made in the molecular kinetic theory of an
ideal gas: - all
molecules are identical
- molecules in random motion
- newtonian mechanics apply
- vol of gas molecules negligible (compared to vol of gas)
- collisions are elastic
6. state and explain what happens to the speed of
molecules in a gas when
the temperature increases: the average/mean speed of
molecules increases (1)
as mean ke proportional to absolute temp
7. state what is meant by an elastic collision: a collision in
which ke is conserved
8. two different gases at the same temp have molecules
with different mean
square speeds. explain how this is possible: masses are
different (1) but because
ke same, mean square speeds must be different
9. why does the total ke of an ideal gas equal the total
internal energy of an
