DP Chemistry (last assessment 2024)

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Question 21M.2.hl.TZ1.4d(ii)

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Date May 2021 Marks available [Maximum mark: 1] Reference code 21M.2.hl.TZ1.4d(ii)
Level hl Paper 2 Time zone TZ1
Command term State Question number d(ii) Adapted from N/A
d(ii).
[Maximum mark: 1]
21M.2.hl.TZ1.4d(ii)

Hydrogen peroxide can react with methane and oxygen to form methanol. This reaction can occur below 50°C if a gold nanoparticle catalyst is used.

Consider the first stage of the reaction.

CH4 (g) + H2O (g) ⇌ CO (g) + 3H2 (g)

(d(ii))

State one reason why you would expect the value of ΔH calculated from the ∆Hf⦵ values, given in section 12 of data booklet, to differ from your answer to (d)(i).

[1]

Markscheme

bond energies are average values «not specific to the compound» ✔

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