An industrial chemist investigated the rate of decomposition of hydrogen peroxide solution using a manganese(IV) oxide catalyst:
2H2O2(aq)→2H2O(l)+O2(g)2\text{H}_2\text{O}_2(\text{aq}) \rightarrow 2\text{H}_2\text{O}(\text{l}) + \text{O}_2(\text{g})2H2O2(aq)→2H2O(l)+O2(g)
The chemist measured the volume of oxygen gas collected in a gas syringe over a period of 60 seconds. Figure 1 shows the line of best fit drawn through the experimental results during the steady phase of the reaction.
Determine the gradient of the line of best fit in Figure 1. Use the equation:
Gradient=Change in volume of oxygen collectedChange in time\text{Gradient} = \frac{\text{Change in volume of oxygen collected}}{\text{Change in time}}Gradient=Change in timeChange in volume of oxygen collected
Give the unit.
The initial volume of gas in the gas syringe before the catalytic reaction accelerated is where the line of best fit meets the vertical axis. Determine this initial volume.
Rate of reaction Questions
Practise AQA GCSE Chemistry Rate of reaction with exam-style questions for Foundation and Higher tier. 46 questions covering Calculating rates of reactions, Factors which affect the rates of chemical reactions, Collision theory and activation energy, and Catalysts, matched to the AQA GCSE Chemistry (8462) 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.