(a)[2]
State what is meant by the term catalyst.
(b(i))[1]
State why the mass of the conical flask and its contents gets smaller as time passes.
(b(ii))[1]
Explain why the rate of reaction is highest at the start of the reaction.
(b(iii))[1]
Explain why the rate of reaction eventually becomes zero.
(c)[3]
Explain in terms of collision theory why the rate of reaction is higher at an increased temperature.
(d)[3]
Calculate the mass of O$_2$ that forms.
(e)[1]
State the effect on the mass of oxygen produced if the mass of powdered manganese(IV) oxide catalyst is increased.
(f)[2]
Write a symbol equation for this decomposition.