120848
| Question | Answer |
| Standard state | Pressure: 100KPa(about 1 atm) Temperature: 298K (25 degrees) |
| Standard enthalpy change of reaction | The enthalpy change when the reaction occurs in the molar quantities shown in the chemical equation, under standard conditions in their standard states |
| Standard enthalpy change of formation | The enthalpy change when 1 mole of a compound is formed from its elements in their standard states under standard conditions |
| Standard enthalpy change of combustion | The enthalpy change when 1 mole of a substance is completely burnt in oxygen under standard conditions |
| Hess's Law | The total enthalpy change of a reaction is always the same, no matter which route is taken. It works out the enthalpy change via an alternative route. |
| Enthalpy change | The heat energy transferred in a reaction at constant pressure |
| Exothermic | -Gives out heat energy -Delta H is negative |
| Endothermic | -Absorbs heat energy -Delta H is positive |
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