Chemistry · May / June 2023 · Paper 41 · Question 4
0620
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The question as text
Oxygen is produced by the decomposition of aqueous hydrogen peroxide. Manganese(IV) oxide, MnO2, is a catalyst for this reaction.
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4(a)[2]
M1 increases the rate of reaction /
speeds up a reaction(1)
M2 unchanged at the end of the reaction(1)
4(b)(i)[1]
oxygen escapes from the flask or apparatus
concentration of hydrogen peroxide is highest at the start / particles of hydrogen peroxide are closest together at the start
4(b)(ii)[1]
OR
collision frequency is highest at the start
4(b)(iii)[1]
the hydrogen peroxide is used up /
ALL the hydrogen peroxide has reacted or decomposed
4(c)[3]
M1 kinetic energy of particles increases(1)
M2 frequency of collisions between particles increases(1)
M3 more or higher percentage or higher proportion or
higher fraction of particles have energy greater than / equal to activation energy
OR
more of the collisions or higher percentage or higher fraction of collisions have energy greater than or equal to activation energy(1)
4(d)[3]
M1 (50.0 × 0.200 ÷ 1000 =) 0.01(1)
M2 0.005(1)
M3 0.16(0)(1)
4(e)[1]
no effect
2HgO → 2Hg + O2
4(f)[2]
M1 all formulae correct(1)
M2 equation correct(1)
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