Iodine monochloride, ICl, is a yellow-brown gas. It reacts with hydrogen gas under certain conditions as shown.
2ICl(g) + H2(g) → 2HCl(g) + I2(g)
Experiments are performed using different starting concentrations of ICl and H2. The initial rate of each reaction is measured. The following results are obtained.
experiment | [ICl]/mol dm⁻³ | [H2]/mol dm⁻³ | relative rate of reaction
---|---|---|---
1 | 4.00 × 10⁻³ | 4.00 × 10⁻³ | 1.00
2 | 4.00 × 10⁻³ | 7.00 × 10⁻³ | 1.75
3 | 4.00 × 10⁻³ | 1.00 × 10⁻² | 2.50
4 | 5.00 × 10⁻³ | 8.00 × 10⁻³ | 2.50
5 | 7.00 × 10⁻³ | 8.00 × 10⁻³ | 3.50

Q: What topic does this question test?

This question tests Reaction kinetics in A-Level Chemistry (syllabus code 9701). It is worth 12 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Chemistry May/June 2018 examination, Paper 4 Variant 2 (9701_s18_qp_42.pdf).

Question

Iodine monochloride, ICl, is a yellow-brown gas. It reacts with hydrogen gas under certain conditions as shown.
2ICl(g) + H2(g) → 2HCl(g) + I2(g)
Experiments are performed using different starting concentrations of ICl and H2. The initial rate of each reaction is measured. The following results are obtained.
experiment | [ICl]/mol dm⁻³ | [H2]/mol dm⁻³ | relative rate of reaction
---|---|---|---
1 | 4.00 × 10⁻³ | 4.00 × 10⁻³ | 1.00
2 | 4.00 × 10⁻³ | 7.00 × 10⁻³ | 1.75
3 | 4.00 × 10⁻³ | 1.00 × 10⁻² | 2.50
4 | 5.00 × 10⁻³ | 8.00 × 10⁻³ | 2.50
5 | 7.00 × 10⁻³ | 8.00 × 10⁻³ | 3.50

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