The decomposition of hydrogen peroxide, H₂O₂, to oxygen and water is catalysed by manganese(IV) oxide.

a. Define the term catalyst.

b. The results for the decomposition of a sample of hydrogen peroxide are shown in the table.

i. Draw a graph of concentration of hydrogen peroxide (vertical axis) against time (horizontal axis). Draw a curve of best fit.

ii. Use your graph to determine the half-life of the reaction. Show your working.

iii. Use your graph to find the rate of reaction after 2 min.

c. i. Give the rate equation for the reaction. Explain your answer.

ii. Use your answer to part b, iii, to calculate the value of the rate constant, k, and give the units.

iii. Using your rate equation, find the rate of reaction when [H₂O₂] = 2 mol dm^–3.

Transcribed Image Text:

Time/min 1. 2. 6. 7 8 [H,0,1/mol dm-3 1.60 1.04 0.61 0.40 0.25 0.16 0.10 0.06 0.04 3.