Edexcel IAL Chemistry AS Changing the Subject

Edexcel IAL Chemistry AS Changing the Subject
Pearson Edexcel International Advanced Subsidiary/Advanced Level in Chemistry, Issue 1, September 2017Chemistry XCH11/YCH11

Practise Edexcel IAL Chemistry changing the subject of an equation by rearranging rate expressions to calculate rate constants with matching units.

How this is tested

  • Rearrange a rate equation to make k the subject, then calculate its value and units from experiment data.

Question 18(a)(v)

[Maximum number: 2]

This question is about the reaction between nitrogen monoxide and oxygen.

NO( g)+1/2O2( g)⇌NO2( g)\mathrm{NO}(\mathrm{~g})+1 / 2 \mathrm{O}_{2}(\mathrm{~g}) \rightleftharpoons \mathrm{NO}_{2}(\mathrm{~g})

The results of a series of kinetics experiments are shown.

Table for Question 18(a)(v) — Edexcel A-Level Chemistry AS

The data for experiments 1-5 were plotted on a graph.

Figure for Question 18(a)(v) — Edexcel A-Level Chemistry AS

Calculate the rate constant for this reaction using the data from experiment 1 and your rate equation. Include units in your answer.