Investigation (2014 VCE)

1) A student investigated the effect of different catalysts on the molar enthalpy of the decomposition reaction of hydrogen peroxide. The student's report is provided below.

The student's conclusion is not valid because the experimental design is flawed. Critically review the student's experimental design. In your response, you should:
• identify and explain three improvements or modifi cations that you would make to the experimental design
• discuss the experimental outcomes you would expect regarding the effect of different catalysts on molar heats of reaction. Justify your expectations in terms of chemical ideas you have studied this year.