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Date November 2020 Marks available 2 Reference code 20N.2.hl.TZ0.7
Level HL Paper 2 Time zone TZ0
Command term Deduce Question number 7 Adapted from N/A

Question

Nitrogen monoxide reacts with oxygen gas to form nitrogen dioxide.

The following experimental data was obtained.

Deduce the partial order of reaction with respect to nitrogen monoxide and oxygen.

 

 

[2]
a.

Nitrogen monoxide reacts with oxygen gas to form nitrogen dioxide.

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

 

[1]
b.

Markscheme

NO: second ✔
O2: first ✔

a.

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 ✔

b.

Examiners report

Most candidates could correctly deduce the order of each reactant from rate experimental rate data.

a.

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

b.

Syllabus sections

Core » Topic 6: Chemical kinetics » 6.1 Collision theory and rates of reaction
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Core » Topic 6: Chemical kinetics
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