A student investigated the rate of decomposition of hydrogen peroxide catalysed by manganese(IV) oxide by measuring the volume of oxygen gas produced over time. The reaction was carried out at two different temperatures, and the results are shown as Curve A (at 40∘C40^\circ\text{C}40∘C) and Curve B (at 25∘C25^\circ\text{C}25∘C).
| Time / s | Volume of O2\text{O}_2O2 produced / cm3\text{cm}^3cm3 (Curve A) | Volume of O2\text{O}_2O2 produced / cm3\text{cm}^3cm3 (Curve B) |
|---|---|---|
| 0 | 0.0 | 0.0 |
| 20 | 32.0 | 15.0 |
| 40 | 52.0 | 28.0 |
| 60 | 66.0 | 39.0 |
| 80 | 75.0 | 48.0 |
| 100 | 79.0 | 55.0 |
| 120 | 80.0 | 61.0 |
| 140 | 80.0 | 66.0 |
| 160 | 80.0 | 70.0 |
| 180 | 80.0 | 73.0 |
Calculate the rate of reaction on Curve A at 40 seconds by using the tangent drawn.
Practise Edexcel GCSE Chemistry Rates of reaction with exam-style questions for Foundation and Higher tier. 166 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.
