A technician investigates a reaction between solution X and solution Y.
Four batches of solution X are prepared. All the solid X has dissolved before the reaction starts.
| Batch | Mass of solid X in g | Total volume of solution X in cm3\text{cm}^3cm3 | Form of solid X before dissolving |
|---|---|---|---|
| A | 3.0 | 150 | large crystals |
| B | 4.0 | 100 | powder |
| C | 6.0 | 150 | small crystals |
| D | 8.0 | 200 | large crystals |
For each test, the technician mixes 25.0 cm3 of solution X with 25.0 cm3 of the same solution Y. The temperature is the same in every test and no catalyst is used.
Calculate the concentration of X in batch B in g/dm3\text{g}/\text{dm}^3g/dm3.
Give the two other batches that should have the same initial rate of reaction as batch B.
Explain your answer to part (b) in terms of particles.
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.