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The Rate Equation & Arrhenius

2017 Paper Two

Question Three
Looking at past AQA A-level Chemistry questions, I wanted to go beyond the answers and focus on thought processes, ideas and tips that will help in examinations.

The series will help you to spot weaknesses and help with revision, or it can serve as addenda to your notes.If you haven't gone through the paper, please look up the questions at, or click the direct link below, and have a go...

AQA A-level CHEMISTRY Paper 2 Organic and Physical ChemistryMonday 19 June 2017

For the units,,,

Cancelling gives…

Our final answer, then, is:

The ‘tricky’ parts of this question...

Rearranging the equation for Ea
Converting into correct units for temperature (degree Celsius to Kelvin)
Make sure you have the correct units at the end

The examiners are looking for units in kJ/mol – the calculation, however, involves Joules.

Rearranging, we get:

Divide by 1000 to convert the answer to kilojoules

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