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Unit 5 Chem Vocab
Term | Definition |
---|---|
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. |