DP Chemistry (last assessment 2024)

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Question 21M.2.sl.TZ1.b(ii)

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

When dinitrogen pentoxide, N2O5, is heated the colourless gas undergoes thermal decomposition to produce brown nitrogen dioxide:

N2O5 (g) → 2NO2 (g) + 12O2 (g)

Data for the decomposition at constant temperature is given.

Deduce the relationship between the concentration of N2O5 and the rate of reaction.

[1]

Markscheme

« rate of reaction is directly» proportional to/∝[N2O5]
OR
doubling concentration doubles rate ✔


Do not accept “rate increases as concentration increases”/ positive correlation

Accept linear

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