Question 21N.2.SL.TZ0.2
| Date | November 2021 | Marks available | [Maximum mark: 6] | Reference code | 21N.2.SL.TZ0.2 |
| Level | SL | Paper | 2 | Time zone | TZ0 |
| Command term | Calculate, Compare, Sketch, State | Question number | 2 | Adapted from | N/A |
State what is meant by the internal energy of an ideal gas.
[1]
the total «random» kinetic energy of the molecules/atoms/particles ✓
A quantity of 0.24 mol of an ideal gas of constant volume 0.20 m3 is kept at a temperature of 300 K.
Calculate the pressure of the gas.
[1]
«Pa» ✓
The temperature of the gas is increased to 500 K. Sketch, on the axes, a graph to show the variation with temperature T of the pressure P of the gas during this change.
[2]
straight line joining (300, 3) and (500, 5) ✓
drawn only in the range from 300 to 500 K ✓
Allow ECF from (b)(i) for incorrect initial pressure.
Allow tolerance of ± one grid square for the endpoints.
A container is filled with 1 mole of helium (molar mass 4 g mol−1) and 1 mole of neon (molar mass 20 g mol−1). Compare the average kinetic energy of helium atoms to that of neon atoms.
[2]
temperature is the same for both gases ✓
«average» kinetic energy is the same «because OR depends on only» ✓
Award [1 max] for a bald statement that kinetic energy is the same.
