AQA Chemistry (2013) Unit 3

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3.3.1 Comparing the Energy Released by Fuels

·         Energy released (J) = mass (g) x specific heat capacity (J/g oC) x rise in temperature (oC)

3.3.2 Energy Transfers in Solutions

·         Polystyrene (insulator) used as calorimeter to measure energy change

3.3.3 Energy Level Diagrams

·         Measure in kJ/mol

·         Exothermic

o   Products lower than reactants

o   Energy release

o   Surroundings get hotter

·         Endothermic

o   Products higher than reactants

o   Energy taken in


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