What characteristics would make a gas non-ideal?

Answer 1

The gas molecules interact with one another

Answer 2

An ideal gas has particles with zero volume that have no attractive or repulsive forces between them. Real gases have particles with a definite shape and volume. They also have weak attractive forces to each other. The larger the volume and the stronger the forces, the less ideal the gas will be.

Answer 3

As the volume decreases, so does the space between the gas molecules. As the gas molecules become closer together, they are more likely to attract and this therefore ruins any chance of using gas laws and ideal behavior.

Answer 4

Real gases are composed of atoms and molecules that have volume.
Real gases are composed of atoms and molecules that exhibit both attractive and repulsive forces on other atoms and molecules.

Answer 5

Highly polar gases deviate from ideal behavior, such as ammonia (NH3) and water vapor (H2O), to a larger degree than polar gases.