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Unit 5 Chem Vocab

TermDefinition
Phase Diagram Graph of pressure and temperature that shows the condition under which the 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 to melt one mole of a solid.
Nonvolatile Liquids that do not evaporate readily because of strong attractive forces between particles.
Deposition Change of a gas directly to a solid.
Sublimation Change of a solid directly to a gas.
Kinetic Molecular Theory Particles are in constant motion.
Molar Enthalpy of Vaporization The amount of energy (heat) needed to vaporize one mole of a liquid.
∆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 absorbed, products higher.
Exothermic Heat energy released, products lower.
Enthalpy Change Using Hess' Law.
Created by: fry984
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