DP Chemistry (last assessment 2024)

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Question 20N.2.hl.TZ0.b

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Date November 2020 Marks available [Maximum mark: 1] Reference code 20N.2.hl.TZ0.b
Level hl Paper 2 Time zone TZ0
Command term Deduce, Justify Question number b Adapted from N/A
b.
[Maximum mark: 1]
20N.2.hl.TZ0.b

Nitrogen monoxide reacts with oxygen gas to form nitrogen dioxide.

Deduce, giving a reason, whether the following mechanism is possible.

 

[1]

Markscheme

not possible AND «proposed» mechanism does not match experimental rate law
OR
not possible AND «proposed» mechanism shows zero/not first order with respect to oxygen ✔

Examiners report

60% of candidates could explain why the proposed reaction mechanism was inconsistent with the empirical data given.

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