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Developing Fuels

1.1 Getting energy from fuels

Exothermic Endothermic
Gives out heat energy Requires heat energy
Negative ^H Positive ^H
Energy given out during bond breaking Energy given out during bond breaking
> Energy required for bond formation < Energy required for bond formation
Enthalpy level diagram: Enthalpy level diagram:…

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e.g. H2(g) + ½
O

2(g) 1H2O(l)


o
Standard Enthalpy Change of Neutralisation ­ (^H neut ) the enthalpy change when one mole of
hydrogen ions react with one more of hydroxide ions to form one mole of water under standard
conditions and in solutions containing 1 mol dm3

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