LM2 - asi(ka8336 LM02 Phase Change and Thermo mccord(51520...

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asi (ka8336) – LM02 - Phase Change and Thermo – mccord – (51520) 1 This print-out should have 11 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0points For a given substance, which phase has the higher enthlapy? 1. not enough information 2. they are exactly the same 3. the gas CORRECT 4. the liquid
Explanation: The enthalpy of the gas is higher since the molecular are far apart. 002 10.0points The process of vaporization is 1. endothermic, which means energy is absorbed CORRECT 2. exothermic, which means energy is re- leased 3. endothermic, which means energy is released 4. exothermic, which means energy is ab- sorbed Explanation: Vaporizaition is an endothermic process in which energy is absorbed. Becasue gas molecules are higher in enthalpy (energy) since they have essentially not intermoelcular attractions due to the large distances between the molecules. 003 10.0points For a given substance, the enthalpy of a gas is higher than that of the liquid because 1. the enthalpy depends on the electrostatic potential energy of the substance. COR- RECT 2.

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