Chemistry · Oct / Nov 2024 · Paper 12 · Question 1

Helium gas and argon gas are mixed in a closed container at room temperature and pressure (r.t.p.). What happens when the two gases are in the container?

1. AArgon and helium atoms become evenly mixed throughout the container even though they have different masses.
2. BArgon and helium atoms both move towards the bottom of the container. The argon atoms settle more quickly because they are larger and heavier.
3. CArgon and helium atoms both move towards the bottom of the container. The helium atoms settle more quickly because they are smaller and lighter.
4. DArgon atoms move to the bottom of the container because they are heavier. Helium atoms move to the top of the container because they are lighter.

As printed in the paper