Quick questions on Equilibrium I (Topic 10) - Edexcel A-Level Chemistry

4short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is dynamic equilibrium?

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The two key words are "closed" (nothing enters or leaves) and "dynamic" (the reactions never stop, they just balance). For

\text{H}_2(\text{g}) + \text{I}_2(\text{g}) \rightleftharpoons 2\text{HI}(\text{g})

, once equilibrium is reached the amount of each gas is fixed, but individual molecules are constantly forming and decomposing.

What is q1?

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State Le Chatelier's principle. [2 marks]

What is q2?

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For

\text{N}_2 + 3\text{H}_2 \rightleftharpoons 2\text{NH}_3

(exothermic forward), predict and explain the effect of increasing temperature on the yield of ammonia. [2 marks]

What is q3?

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0.50\ \text{mol}

of ethanoic acid and

0.50\ \text{mol}

of ethanol reach equilibrium with

0.33\ \text{mol}

of ester in a fixed volume

V

. Write the

K_c

expression and show that

K_c

is dimensionless. [3 marks]

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