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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Yes, an ideal gas can turn into a solid through the process of deposition. Deposition occurs when a gas transforms directly into a solid without passing through the liquid phase. This usually happens when the temperature of the gas is decreased significantly.
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.
No, oxygen is not considered an ideal gas because it does not perfectly follow the ideal gas law at all temperatures and pressures.
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.
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.
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.