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Unit 5

Chemistry

TermDefinition
Phase Diagram a graph of pressure and temperature that shows the conditions under which a substance exists
STP Standard Temperature and Pressure
Triple Point the temperature and pressure at which the solid, liquid, and gas phases co-exist
Critical Point where substance indicates the critical temperature and critical pressure
Molar Enthalpy of Fusion the amount of energy required o melt one mole of a solid
Nonvolatile Liquids that do not evaporate readily because of strong attractive forces between particles
Deposition the change of a gas directly to a solid
Sublimation the change of a solid directly to a gas
Kinetic Molecular Theory paricles are in constant motion
Molar Enthalpy of Vaporization the amount of energy as heat needed to vaporize one mole of a liquid
(triangle)H enthalpy of products - enthalpy of reactants
Hess' Law overall enthalpy change in a reaction is equal to the sum of the enthalpy changes for the individual steps in the process
Endothermic heat energy is absorbed; products higher
Exothermic heat energy released; products lower
Enthalpy Change using Hess' law; process equals the sum of the energy difference of products minus the sum of the energy difference of the reactants
Created by: catelyn.orendi
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