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An ideal gas is an abstraction - a simplification. No real gas behaves exactly like an "ideal gas". The reason an ideal gas is used is because (a) the math is simpler, and (b) this is close enough for real gases, in many cases.
Thought this is often not stated explicitly, we can safely assume that an "ideal gas" is supposed to remain a gas, regardless of the temperature and pressure.
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Which state must be supplied with the most energy to turn it into a gas?
The state that requires the most energy to turn it into a gas is a solid, as it needs to overcome intermolecular forces holding its structure together.
Is oxygen considered an ideal gas?
No, oxygen is not considered an ideal gas because it does not perfectly follow the ideal gas law at all temperatures and pressures.
What is an imaginary gas that conforms perfectly to the kinetic molecular theory callled?
An imaginary gas that conforms perfectly to the kinetic molecular theory is called an ideal gas. Ideal gases have particles with no volume and no intermolecular forces between them, allowing them to perfectly follow the assumptions of the kinetic molecular theory.
What does a gas have to go through to get to a solid?
A gas must undergo a process called deposition to directly transition into a solid state. This involves the gas cooling down and losing energy, causing the gas particles to slow down and come together to form a solid.
Change from a solid to a gas and vice versa?
Changing from a solid to a gas is called sublimation, where a solid directly transitions to a gas without passing through the liquid phase. The reverse process, changing from a gas to a solid, is called deposition, where a gas transforms directly into a solid without becoming a liquid.
