5 Chemical energetics
5.1 Exothermic and endothermic reactions Core
1 State that an exothermic reaction transfers thermal energy to the surroundings leading to an increase in the temperature of the surroundings
2 State that an endothermic reaction takes in thermal energy from the surroundings leading to a decrease in the temperature of the surroundings
3 Interpret reaction pathway diagrams showing exothermic and endothermic reactions Supplement
4 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
5 Define activation energy, Ea , as the minimum energy that colliding particles must have to react
6 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
7 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
8 Calculate the enthalpy change of a reaction using bond energies
Note that many points has been removed from the old syllabus
Where to go from here
CIE IGCSE Chemistry
Cambridge Chemical Energetics
IGCSE 0620 All Resources
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