Last updated on Sep 20, 2026

Reversibility & Equilibrium (AQA GCSE Chemistry): Flashcards

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Reversible reactions

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What are reversible reactions?

Reactions that go in both directions

Arrow for normal reactions

Single arrow: $A + B \rightarrow C + D$

Arrow for reversible reactions

Split arrow: $A + B \rightleftharpoons C + D$

What $\rightleftharpoons$ indicates

Reaction can go in both directions

$NH_4Cl$ heated equation

$NH_4Cl \rightleftharpoons NH_3 + HCl$

Products when $NH_4Cl$ heated

Ammonia gas and hydrogen chloride gas

If forward exothermic, reverse is?

Endothermic

Energy in forward vs reverse

Equal amounts

Blue $CuSO_4$ to white + water: energy?

Takes in energy (endothermic)

White $CuSO_4$ + water to blue: energy?

Gives out energy (exothermic)

Haber process equation

$N_2 + 3H_2 \rightleftharpoons 2NH_3$

Haber process: temperature used

Around 450°C (compromise)

Haber: lower temperature effect

More ammonia but slower reaction

Haber: higher temperature effect

Faster reaction but less ammonia

White solid forms when $NH_3$ & HCl cool

$NH_4Cl$ (ammonium chloride)

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Rate of Reaction