What does equilibrium mean?
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A. The two sides of a reaction have equal concentrations,
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B. Total amounts of products and readiants are not changing
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C. There are no more reactants present in the reaction solution
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D. The reaction has stopped happening entirely.

according to kinetic-molecular theory, the following would not be considered an ideal gas:

a gas at very low volumes, when gas particles are very close together

a gas at very low temperatures, when gas particles have very little kinetic energy a gas

a gas with highly polar molecules that have very strong intermolecular forces

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