| Term | Definition |
|---|
| calorie | 1000 calories in one Calorie, a unit of energy |
| Calorie | 1 Cal = 1kcal, a unit of energy |
| Calorimeter | a device used to measure the amount of energy something has, in calories |
| Endothermic Process | A process which absorbs energy |
| Exothermic Process | A process which releases energy |
| Heat | Symbolized by q, a form of energy that is measured in Joules |
| Enthalpy | The total heat energy in a system |
| Entropy | A measure of the disorder of a system |
| Heat of Reaction | change in enthalpy |
| Joule | unit of energy (4186J=4.18kJ=1000cal=1Cal) |
| Law of Conservation of Energy | Energy cannot be created or destroyed |
| Specific Heat | Symbolized by c, a unique property of an object that describes the amount of heat it can hold |
| Heat of Fusion | The heat (lost or gained) by a substance being melted or frozen |
| Heat of vaporization | The heat (lost or gained) by a substance being boiled or condensing |
| Thermochemistry | The study of heat changes in chemistry |
| q=mc∆t | heat is equal to the mass times specific heat times the change in temperature |
| Change in Temperature | final temp-initial temp |
| Spontaneous | Reactions which happen more often: Reactions that have decreasing energy (exothermic) and increasing entropy. |
| q=m∆H | the heat of a reaction is equal to the mass times the heat of vaporization or the heat of fusion |
| Temperature | the measure of the speed of particles in a substance |
| Phase change | A change from liquid to solid or liquid to gas involving a change in heat but not in temperature |
| Phase change diagram | represents the change in energy versus change in heat of a substance undergoing phase changes (remember that the graph rises and then plateaus twice!) |
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