A12.1 Factors Affecting Rates of Chemical Reactions

Surface area, concentration and pressure explained with collision theory. The PowerPoint 95 s / 48 s times and the workbook 96 s / 51 s / 29 s times are kept separate.

Learning outcomes

• Explain surface area using collision theory
• Explain concentration using collision theory
• Explain pressure using collision theory
• Identify control variables in a rate investigation

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More T-Level Chemistry topics

A11.1 Principles of Collision TheoryActivation energy, successful and unsuccessful collisions, and why particles must meet in the correct spatial orientation.A11.2 Temperature and Rate of ReactionHow temperature changes kinetic energy, collision frequency and the Maxwell–Boltzmann distribution, and why rate rises or falls.A11.3 Catalysts and Reaction RateWhat a catalyst is, the alternative lower-Ea pathway, and how that appears on a Maxwell–Boltzmann distribution at constant temperature.A12.2 Calculating Rate of ReactionAverage rate from amount of reactant used or product formed divided by time, including compound units and graph chords.A12.3 Enthalpy ChangesH and ΔH, exothermic and endothermic profiles, activation energy, and why a catalyst does not change ΔH.A12.4 Catalysts in Industrial ReactionsLower activation energy, faster industrial turnaround and reduced costs, with unchanged ΔH.A12.5 Reversible ReactionsDynamic equilibrium and Le Chatelier’s principle for concentration, temperature and pressure.A12.6 The Haber ProcessTypical Haber conditions and the compromise between equilibrium yield, rate and economic cost.

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