A12.3 Enthalpy Changes

A12.3 Enthalpy Changes T-Level Science videos from JD Science.

Original JD Science T-Level Chemistry lesson. Captions are available in the player. Learning outcomes are listed below and on the student worksheet. Teacher marking schemes require an authorised teacher sign-in and are not stored at a public URL.

H and ΔH, exothermic and endothermic profiles, activation energy, and why a catalyst does not change ΔH.

Learning outcomes

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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.A12.1 Factors Affecting Rates of Chemical ReactionsSurface 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.A12.2 Calculating Rate of ReactionAverage rate from amount of reactant used or product formed divided by time, including compound units and graph chords.A12.4 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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