Topic C3: Physical chemistry (Edexcel iGCSE Chemistry)

This bundle of 12 lessons covers the majority of the content in Topic C3 (Physical chemistry) of the Edexcel iGCSE Chemistry specification. The sub-topics and specification points covered within these lessons include:

[a] Energetics

• Know that chemical reactions can be endothermic or exothermic reactions
• Calculate the heat energy change using the expression involving specific heat capacity
• Draw energy level diagrams to represent endothermic and exothermic reactions
• Use bond energies to calculate the enthalpy change

[b] Rates of reaction

• Describe experiments to investigate the effect of changing surface area, concentration, temperature and the addition of a catalyst on the rate of reaction
• Describe and explain the effects of changing surface area, concentration and temperature on a rate of reaction with reference to the collision theory
• Know the definition of a catalyst and understand how it reduces the activation energy of a chemical reaction
• Draw and explain reaction profile diagrams

[c] Reversible reactions and equilibria

• Know that some reactions are reversible
• Know the characteristics of a reaction at dynamic equilibrium
• Know the effect of changing either the temperature of pressure on the position of the equilibrium

All of these lesson presentations and accompanying resources are detailed and engaging and contain regular progress checks to allow the students to constantly assess their understanding.