Molecules at the surface of a liquid can enter the vapor phase only if A

Molecules at the surface of a liquid can enter the

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49.Molecules at the surface of a liquid can enter the vapor phase only ifA.equilibrium has not been reached.B.the concentration of the vapor is zero.C.their energy is high enough to overcome the attractive forces in the liquid.D.condensation is not occurring.____50.When does the concentration of a vapor decrease?____51.A liquid-vapor system at equilibrium is kept at constant temperature while the volume of the system is doubled. When equilibrium is restored,____52.When energy as heat is applied to a liquid-vapor system at equilibrium, a new equilibrium state will have____53.If the temperature of a liquid-vapor system at equilibrium is reduced, theA.concentration of the vapor will decrease.B.rate of evaporation will increase.C.equilibrium is unaffected.D.percentage of liquid in the system will decrease.____54.If the temperature of a liquid-vapor system at equilibrium increases, the new equilibrium condition will____55.At its triple point, water can
____56.The triple point of a substance is the temperature and pressure conditions at which____57.Above the critical temperature, a substanceA.does not have a vapor pressure.C.cannot exist in the liquid state.B.sublimes.D.is explosive.____58.What is the critical pressure?____

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