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Card 1 of 22

Why is enthalpy change alone insufficient to predict if a reaction will occur?

A

Because enthalpy determines spontaneity, while entropy affects only reaction rate.

B

Because exothermic reactions (negative ΔH\Delta HΔH) always occur spontaneously regardless of entropy.

C

Because endothermic reactions (positive ΔH\Delta HΔH) can occur spontaneously if driven by entropy.

D

Because endothermic reactions (positive ΔH\Delta HΔH) can occur spontaneously only if entropy decreases.

Card 1 of 22

Gibbs free-energy change, ΔG, and entropy change, ΔS (A-level only) Flashcards

  1. A Level
  2. /Chemistry
  3. /Gibbs free-energy change, ΔG, and entropy change, ΔS (A-level only)

22 flashcards on AQA A Level Chemistry Gibbs free-energy change, $\Delta G$ , and entropy change, $\Delta S$ (A-level only): the key terms, definitions and equations you need to recall for Paper 1, Paper 2 and Paper 3.

Flashcards