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5.3 Equilibria

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Question 42

A scientist uses a computer model to study the reversible reaction:

X⇌Y \mathrm{X \rightleftharpoons Y} X⇌Y

The model represents a sealed reaction vessel. The table shows information recorded during a 10 s interval.

InformationResult
Number of X particles at the beginning and end of the interval500 and 500
Number of Y particles at the beginning and end of the interval200 and 200
Number of X particles that change into Y during the interval40

Explain how the information shows that the mixture is at dynamic equilibrium.

[3]
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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