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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
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
