Suggest two precautions the student should use to reduce the danger when handling aqueous hydrogen peroxide.
Give one reason for fitting the cotton wool plug loosely.
Which two measurements should the student take in order to track the reaction rate in this experiment?
Draw the apparatus used by the student to obtain the results shown in the table. Label the device used to collect and measure the volume of oxygen gas.
Draw a graph on the grid from the data in the table. Join the points with a smooth curve.
Use the graph to find the volume of oxygen formed in the first $50\,\text{s}$ and in the second $50\,\text{s}$.
Use your answers to (e)(i) to work out the average volume of oxygen released each second in the first $50\,\text{s}$ and in the second $50\,\text{s}$.
Use your knowledge of rates of reaction to explain why the two answers to (e)(ii) are different.