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5.3 Equilibria

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Question 39

A computer simulation models a solution in a stoppered flask, in which substance P changes reversibly into substance Q.

P(aq)⇌Q(aq) \mathrm{P(aq) \rightleftharpoons Q(aq)} P(aq)⇌Q(aq)

The amounts of P and Q are the same at the end of a one-minute interval as at the start. During this interval, the simulation records 240 particles of P changing into Q.

Which statement about this one-minute interval is correct?

[1]
A

Fewer than 240 particles of Q change into P.

B

No particles of Q change into P.

C

240 particles of Q change into P.

D

More than 240 particles of Q change into P.

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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