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IB Chem 5 SL
| Question | Answer |
|---|---|
| Temperature | the average kinetic energy of molecules (K). |
| Heat | the amount of energy exchanged due to a temperature difference between two substances (J). |
| Enthalpy (H) | the amount of energy or heat content of a substance. |
| Standard enthalpy change of reaction (ΔH⁰) | the difference between the enthalpy of the products and the enthalpy of the reactants at 298K and 1.00 x 10E5Pa. |
| Change in enthalpy (ΔH) | enthalpy of products less reactants. It is the heat energy change per mole. |
| exothermic reactions | the temperature of the surroundings increases and ΔH is negative |
| endothermic reactions | the temperature of the surroundings decreases and ΔH is positive |
| Hess’s Law | In a chemical reaction the total change in chemical potential energy (enthalpy change) must be equal to the energy lost or gained by the reaction system. |
| Standard enthalpy change of formation (ΔH⁰f) | the enthalpy change that results when one mole of a compound is formed from its elements at 298K and 1.00 x 10E5Pa. |
| Standard enthalpy change of combustion (ΔH⁰C) | the enthalpy change that results when one mole of a compound reacts with oxygen at 298K and 1.00 x 10E5Pa |
| Average bond enthalpy | the amount of energy required to break one mole of bonds in the gaseous state averaged across a range of compounds containing that bond. |
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andrewweng0406
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