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5.3 Equilibria

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Question 11
F

A reversible reaction, A⇌B\mathrm{A \rightleftharpoons B}A⇌B, takes place in a sealed flask at constant temperature. Only A is present at the start.

The graph shows how the concentrations of A and B change with time.

image

Which statement is correct?

[1]
A

Equilibrium is reached at about 3 min, because the concentrations of A and B are equal at this time.

B

After 6 min, the forward and reverse reactions have both stopped.

C

After 6 min, A changes into B at the same rate as B changes into A.

D

After 6 min, the reaction has finished because all of A has been used up.

Markscheme

5.3 Equilibria Questions

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

47 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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