In a water-treatment trial, two solutions react to form a cloudy solid. A light sensor records the time taken for the mixture to reach a fixed cloudiness.
The same volume of each solution is used in every experiment. All conditions other than the concentration and temperature shown are kept the same.
| Experiment | Concentration of one reactant in mol/dm³ | Temperature in °C | Time taken to reach the fixed cloudiness in s |
|---|---|---|---|
| 1 | 0.20 | 20 | 75 |
| 2 | 0.50 | 50 | 20 |
Experiment 3 uses a concentration of 0.20 mol/dm³ and a temperature of 50 °C.
Give the range in which the time taken in experiment 3 is expected to lie.
Explain your answer to part (a).
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.