Equal masses of the same solid reactant were added to excess of the same solution. The temperature and all other conditions were kept the same. The volume of gaseous product formed was recorded after 20 s.
| Solid sample | Total exposed surface area | Volume of gaseous product after 20 s |
|---|---|---|
| Coarse granules | 12 cm2 | 20 cm3 |
| Fine granules | 36 cm2 | 48 cm3 |
Calculate the mean rate of formation of gaseous product during the first 20 s for each sample.
A student claims that tripling the exposed surface area of the solid triples the mean rate of reaction.
Evaluate the student's claim. Use the results and collision theory in your answer.
127 exam-style questions on AQA GCSE Chemistry 6.1 Rate of reaction, covering 6.1.1a Calculating rates of reactions, 6.1.1b Gradient of a tangent as rate, 6.1.2 Factors which affect the rates of chemical reactions, 6.1.3 Collision theory and activation energy, and 6.1.4 Catalysts. Each one has a worked solution and a mark scheme showing where the marks go.