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Chem Unit 5 Vocab
| 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-exists. |
| 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 | The change of a gas directly to a solid. |
| Sublimation | The change of a solid directly to a gas |
| Kinetic molecular theory | Particles are in constant motion |
| Molar Enthalpy of Vaporization | The amount of energy as 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 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 |