Summary Energy Change and Rates of Reaction

These notes combine detailed theory, worked examples, calculations, diagrams, and examination-style questions to help learners confidently master both the energetic and kinetic aspects of chemical reactions. Concepts are explained step by step, enabling students to strengthen their understanding while developing the analytical skills required for success in Physical Sciences. Topics covered include: Energy changes in chemical reactions Endothermic and exothermic reactions Potential energy diagrams Activation energy Bond breaking and bond formation Calculating enthalpy changes (ΔH) Heat of reaction Hess's Law Reaction profiles and energy diagrams Introduction to reaction rates Collision Theory Effective collisions and activation energy Factors affecting the rate of reaction Concentration Temperature Pressure (for gases) Surface area Catalysts and their role Interpreting graphs related to reaction rates Practical applications of reaction kinetics Examination-style theory and calculation questions with fully worked solutions Perfect for: Grade 12 IEB Physical Sciences learners Students preparing for tests, assignments, and practical assessments Preliminary and final examination revision Learners aiming to improve their understanding of reaction kinetics and thermochemistry Students striving for distinctions in Physical Sciences