aqa a level physics paper 2 questions & answers

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