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Thermochemistry
Terms and Definitions
| Question | Answer |
|---|---|
| Endothermic | Reaction where heat/energy is taken in + |
| Exothermic | Reaction where heat/energy is given out - |
| Heat of Reaction | This is the heat change that occurs when a chemical reaction takes place according to given chemical formula |
| Heat of Combustion | This is the heat change that occurs when one mole of a substance is burnt in excess oxygen |
| Heat of Formation | This is the heat change that occurs when one mole of a substance is formed from its elements in its standard states |
| Heat of Solution | This is the heat change that occurs when one mole of a substance is dissolved in excess solvent |
| Kilogram Calorific Value | This is the heat change that occurs when one kilogram of a fuel is completely burnt |
| Hess' Law | This states that the heat change for a chemical reaction depends on the initial and final temperatures only and is independent of the path followed |
| Heat of Neutralisation | This is the heat change that occurs when one mole of H+ ins from an acid is completely reacted with one mole of OH- ions from a base. |
| 3 precautions to ensure accurate reading during the HoN experiment? | 1: Accurate thermometer 2: Insulated beaker 3: Thorough mixing/stirring 4: Same temperature at start |
| Bond energy | Bond energy is the energy required to completely break up 1 mole of covalent bonds and completely separate the neutral atoms formed. |
| Specific Heat Capacity | This is the amount of energy required to raise the temperature of Ikg of water by 1C |
Created by:
cbschemistry
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