← Thermochemical principles and the properties of particles and substances

2 How this connects to your other standards

Thermochemistry is the “will it happen?” standard. That question reappears in equilibria and redox in different clothes.

How this connects

Where these ideas resurface:

Aqueous equilibria (91392): ΔG explains Le Châtelier A system is at equilibrium precisely when ΔG = 0. Every Le Châtelier prediction (heat an endothermic reaction → shifts right) is really a ΔG = ΔH − TΔS argument. Even Kw rising with temperature is because water’s ionisation is endothermic. Redox (91393): E°cell is ΔG in volts ΔG < 0 (spontaneous) and E°cell > 0 (spontaneous) are the same statement, linked by ΔG = −nFE°. If you can reason about one, you can reason about the other, and examiners like asking you to connect them. Organic compounds (91391): the bonds in bond enthalpy Every bond-enthalpy calculation uses organic bonds (C–H, C–C, C=C, C=O, O–H). Hydrogenating an alkene, or combusting an alcohol, are organic reactions used as the standard thermochemistry examples.

Practice for this standard covers the whole topic — flashcards and quiz.