IGCSE-Chemistry-2026-2027-2028-exams
IGCSE Chemistry Revision Notes 2026-2027-2028 Exams / Chemical energetics Revision Notes 2026-2027-2028 Exams
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Cambridge IGCSE Chemistry Notes on Chemical Energetics 2026/2027/2028
Syllabus Content:
Exothermic and endothermic reactions
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
Supplement
- 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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