A manufacturer uses a precipitation reaction to remove dissolved impurities from water. The reaction forms a cloudy solid.
A technician places the same printed mark beneath identical flasks. The same total volume of liquid is used in each flask. The technician records the time taken for the mark to disappear.
| Condition | Time for the mark to disappear in s |
|---|---|
| A | 72 |
| B | 45 |
The technician states that the reaction under condition B is twice as fast as the reaction under condition A.
Evaluate the technician's statement.
Use the results in the table.
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.