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Regarding gases and vapours:
Select true or false for each option, then select Submit.
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A. True. A vapour can only exist below the critical temperature. Above the critical temperature a substance can only exist as a gas.
B. False. Latent heat of vaporization is required for a liquid to evaporate. Condensation back into liquid form releases this energy.
C. False. A substance cannot be a vapour above its critical temperature.
D. True. Pressure is inversely proportional to volume if the temperature remains constant.
E. False. Pressure is related to the number of molecules, i.e. moles, of the gas, not their size: PV = nRT.
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