What does it mean to say that collisions between ideal gas molecules are "elastic?"?

Question

Ideal gas molecules bend and stretch in elastic ways as they collide.
Ideal gas molecules are attracted to each other, and therefore collide repeatedly.
Ideal gas molecules are repelled by each other, and therefore bounce away from each other with great force.
Ideal gas molecules are neither attracted to nor repelled by each other, and therefore do not gain or lose energy as they collide.

Answer 1

Ideal gas molecules are neither attracted to nor repelled by each other, and therefore do not gain or lose energy as they collide.

Answer 2

The molecules pass freely in the process the quantity obtainable. that's what a gasoline is. The gasoline as an entire occupies quantity by way of tension on the partitions of the container. This seems to matter on the kinetic potential of the molecules, and the quantity of area between them. while we derive the appropriate gasoline regulation, we assume that the radius of a molecule is fairly very lots smaller than the dimensions of the container, so that they can forget it. you're fairly splendid; "molecules occupy no quantity" is fairly complicated, and we could continuously say "molecules occupy negligible quantity".

Answer 3

Both momentum and energy is conserved (not lost or increased) after the collision. Energy/momentum can be transfered however.

Answer 4

An elastic collision is one where both momentum and energy is conserved.