aqa a level physics paper
2 questions & answers
what is meant by specific heat capacity - ANSWERSthe energy needed to raise the temperature
of 1kg of material by 1C.
define avogadro's constant - ANSWERSthe number of atoms in 12g of carbon 12 (OR the no. of
particles/atoms in one mole of a substance)
define the specific latent heat of vaporisation of water - ANSWERSthe energy required to
change the state of a unit mass of water to gas (1) without a change in temperature (1)
features of an ideal gas (3) - ANSWERS- collisions are elastic
- molecules have negligible volume
- gas obeys ideal gas law (Boyles law)
assumptions made in the molecular kinetic theory of an ideal gas - ANSWERS- all molecules are
identical
- molecules in random motion
- newtonian mechanics apply
- vol of gas molecules negligible (compared to vol of gas)
- collisions are elastic
state and explain what happens to the speed of molecules in a gas when the temperature
increases - ANSWERSthe average/mean speed of molecules increases (1) as mean ke
proportional to absolute temp
2 questions & answers
what is meant by specific heat capacity - ANSWERSthe energy needed to raise the temperature
of 1kg of material by 1C.
define avogadro's constant - ANSWERSthe number of atoms in 12g of carbon 12 (OR the no. of
particles/atoms in one mole of a substance)
define the specific latent heat of vaporisation of water - ANSWERSthe energy required to
change the state of a unit mass of water to gas (1) without a change in temperature (1)
features of an ideal gas (3) - ANSWERS- collisions are elastic
- molecules have negligible volume
- gas obeys ideal gas law (Boyles law)
assumptions made in the molecular kinetic theory of an ideal gas - ANSWERS- all molecules are
identical
- molecules in random motion
- newtonian mechanics apply
- vol of gas molecules negligible (compared to vol of gas)
- collisions are elastic
state and explain what happens to the speed of molecules in a gas when the temperature
increases - ANSWERSthe average/mean speed of molecules increases (1) as mean ke
proportional to absolute temp
