Reversible Reactions & Equilibria - Chemistry GCSE

Reversible Reaction Symbol?

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Characteristics of a reaction at Dynamic Equilibrium?

1. The forward & reverse reaction occur at the same rate

2. The concentration of the reactants & products remains constant

Catalyst - Reversible Reactions

They don’t impact equilibriums position in a reversable reaction, it only increases the rate of the forward & reverse reaction by the same amount

Effect of changing the temperature on the position of equilibrium in a reversible reaction

An increase (or decrease) in temperature shifts the position of equilibrium in the direction of the endothermic (or exothermic) reaction

Effect of changing the pressure on the position of equilibrium in a reversible reaction

An increase (or decrease) in pressure shifts the position of equilibrium in the direction that produces fewer (or more) moles of gas

Dehydration of Hydrated Copper (II) Sulphate

CuSO₄.5H₂O (s) ⇌ CuSO₄ (s) + 5H₂O (l)

• CuSO₄.5H₂O —> Blue Crystals

• CuSO_{4 —>} White Powder

• 5H₂O —> Water

Thermal Decomposition of Ammonium Chloride

CNH₄Cl (s) ⇌ NH₃ (g) + HCl (g)

• CNH₄Cl —> White Crystals

• NH₃ —> Colourless Gas

• HCl —> Hydrochloric Acid

  Ammonium Test —> Red Litmus turns blue