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5.3 Equilibria

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Question 4

Ammonium chloride is heated in a sealed pressure-resistant vessel. The vessel is kept at a constant temperature.

NH4Cl(s)⇌NH3(g)+HCl(g) \text{NH}_4\text{Cl(s)} \rightleftharpoons \text{NH}_3\text{(g)} + \text{HCl(g)} NH4​Cl(s)⇌NH3​(g)+HCl(g)

The measured amounts of all three substances become constant.

Which comparison of the two reaction rates is correct?

[1]
A

Formation is faster because both gaseous products are present.

B

Decomposition and formation proceed at matching rates.

C

The faster reaction changes repeatedly from one direction to the other.

D

Decomposition is faster because thermal energy is being supplied.

Markscheme

5.3 Equilibria Questions

  1. GCSE
  2. /Chemistry
  3. /5.3 Equilibria

124 exam-style questions on OCR GCSE Chemistry 5.3 Equilibria, covering 5.3.1 Reversible reactions and dynamic equilibrium and 5.3.2 Changing the position of equilibrium. Each one has a worked solution and a mark scheme showing where the marks go.

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