Energetics
- Created by: Shannon
- Created on: 05-03-14 09:12
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- Energetics
- Enthalpy changes
- Endothermic
- Heat energy is taken in
- The energy required to break the bonds in the reactants is greater than the energy released when new bonds are formed.
- ?H is +ve
- Exothermic
- Heat energy is released
- The energy released by bond formation in the products is greater than the energy needed to break the bonds in the reactants.
- ?H is -ve
- Presented in energy level diagrams
- Endothermic
- Calorimetry
- Heat capacity
- The amount of energy needed to raise the temperature of an object by 1K
- Measured in joules
- Energy transferred = mc?T
- Sources of error
- Incomplete combutstion
- Heat loss to surroundings
- Heat capacity of calorimeter
- Heat capacity
- Standard enthalpy change of combustion
- The enthalpy change when one mole of substance is completely burnt in oxygen under standard conditions
- Standard enthalpy change of atomisation
- The enthalpy change when one mole of gaseous atoms is formed from its element under standard conditions
- Standard enthalpy change of formation
- The enthalpy change when one mole of compound is formed from its elements under standard conditions
- Hess' law
- The total energy change for a reaction is independent of the route taken
- Standard enthalpy of neutralisation
- The enthalpy change when solutions of an acid and an alkali react together under standard conditions to produce 1 mole of water
- Terms
- Bond dissociation enthalpy
- The energy needed to break one mole of bond to give separated atoms (gaseous state)
- Bond dissociation enthalpy
- Enthalpy changes
- Enthalpy changes
- Endothermic
- Heat energy is taken in
- The energy required to break the bonds in the reactants is greater than the energy released when new bonds are formed.
- ?H is +ve
- Exothermic
- Heat energy is released
- The energy released by bond formation in the products is greater than the energy needed to break the bonds in the reactants.
- ?H is -ve
- Presented in energy level diagrams
- Endothermic
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