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Unit 5
Chemistry
Term | Definition |
---|---|
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 |