IGCSE Exothermic and Endothermic Reactions

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Syllabus Objectives

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

Revision Notes

IGCSE Chemistry Endothermic and Exothermic reactions

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