IGCSE Chemistry Revision Notes
Topic:Electrochemistry
Sub Topic: 5.1 Exothermic and endothermic reactions
Syllabus Objectives:
CORE:
- State that an exothermic reaction transfers thermal energy to the surroundings leading to an increase in the temperature of the surroundings
- State that an endothermic reaction takes in thermal energy from the surroundings leading to a decrease in the temperature of the surroundings
- Interpret reaction pathway diagrams showing exothermic and endothermic reactions
EXTENDED:
- State that the transfer of thermal energy during a reaction is called the enthalpy change, ?H, of the reaction. ?H is negative for exothermic reactions and positive for endothermic reactions
- Define activation energy, Ea , as the minimum energy that colliding particles must have to react
- Draw and label reaction pathway diagrams for exothermic and endothermic reactions using information provided, to include:
- (a) reactants
- (b) products
- (c) enthalpy change of the reaction, ?H (d) activation energy, Ea
- State that bond breaking is an endothermic process and bond making is an exothermic process and explain the enthalpy change of a reaction in terms of bond breaking and bond making
- Calculate the enthalpy change of a reaction using bond energies
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