Rate of production of oxygen from hydrogen peroxide, using manganese dioxide as a catalyst

What chemical hazard is indicated by this pictogram?

Oxidizer (oxidising agent)

Give one safety precaution that should be taken when using or storing hydrogen peroxide solutions

Reduce amount (dilute) / store small quantities / store cool ( dry, secure, well ventilated, in the dark, in plastic containers) / do not store in glass bottles / wear PPE (gloves, eye protection)

Describe the appearance of the MnO₂ catalyst

Brown solid

Suggest a suitable vessel to collect and measure the oxygen gas expected to be produced in the investigation, assuming no prior decomposition of the H₂O₂ has occurred

(Large) graduated cylinder / gas syringe

Draw a labelled diagram of an arrangement of apparatus and chemicals used to carry out this investigation

You must have either A, B or C + X or Y

{We used A + X in class}

Calculations 2022 Q3

Calculations + Graph 2016 Q3

What type of catalysis was involved in the reactions?

Surface adsorption / heterogenous

Write a balanced equation for the decomposition of hydrogen peroxide

H₂O₂ → H₂O + ½O₂

Graph 2008 Q3

A student has a choice of using the same mass of finely powdered manganese(IV) oxide or coarsely powdered manganese(IV) oxide. Which of these would you expect to have greater average rate of reaction over the first minute of the reaction? Give a reason for your answer

Finely

Greater activity / greater surface area

Graph 2005 Q3