Describe an ideal gas. Explain why it is impossible for an ideal gas to exist.

I think this is it

There is no force of attraction between the molecules of a gas- This isn't true in all conditions. At high pressures and low temperature the molecules of a real gas come closer to each other due to decrease in their kinetic energy. Because of this the inter molecular forces among them increase and cannot be neglected.

Explanation:

answer; talc and gypsum;