A Level Edexcel Chemistry - Topic 8 - Energetics 1/I

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Topic 8 - Energetics 1
Enthalpy Changes
Define Enthalpy change

Enthalpy change is the heat energy change in a reaction at constant
temperature

units at kJ/mol



What is an exothermic reaction

Exothermic reactions give out heat energy

delta H is negative

What is an endothermic reaction

Endothermic reactions absorb heat energy

delta H is positive

Draw and describe the Enthalpy level diagram for an exothermic reaction

In an exothermic reaction, the reactants release energy to the surroundings, so
the products have less enthalpy than the reactants



Topic 8 - Energetics 1 1

, Draw and describe the Enthalpy level diagram for an endothermic reaction

In an endothermic reaction, the reactants take in energy from the surroundings,
so the products have more enthalpy than the reactants




Draw and label the reaction profile diagram for an exothermic reaction




Topic 8 - Energetics 1 2