What are catalysts?
4 marks · NormalDescribe how you would set up an experiment to measure the effect of different solid catalysts on the rate of decomposition of hydrogen peroxide.
State one safety precaution you would take when carrying out this experiment.
What result would show that a solid is not a catalyst for this reaction?
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
(a) Add a measured volume of hydrogen peroxide to a conical flask. Add a known mass of the solid, quickly fit a bung connected to a gas syringe, and measure the volume of oxygen gas produced over a fixed time with each solid catalyst. · must show Hydrogen peroxide in flask, Add solid, Collect and measure gas formed over time
(b) Wear eye protection. · must show Appropriate safety mention
(c) No oxygen gas is produced or the rate is the same as with no catalyst. · must show Stating result shows no catalytic activity
Show mark scheme and worked solution
Marking points
M1 (a) · 1 mark · Describes adding solid to hydrogen peroxide in flask and fitting a gas collection system.
M2 (a) · 1 mark · States to measure volume of oxygen evolved over a fixed time.
B1 (b) · 1 mark · Mentions a relevant safety precaution (e.g., eye protection, gloves).
B2 (c) · 1 mark · States that no oxygen would be produced, or rate remains unchanged if not a catalyst.
Worked solution
(a) Add 100 cm³ of hydrogen peroxide to a conical flask. Add 0.20 g of each solid in turn. Quickly put on a bung with a gas syringe attached. Swirl and record oxygen produced at time intervals.
(b) Wear eye protection.
(c) No oxygen would be collected, indicating no catalytic activity.