DP Chemistry (last assessment 2024)

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Question 22M.2.sl.TZ2.4e(ii)

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Date May 2022 Marks available [Maximum mark: 2] Reference code 22M.2.sl.TZ2.4e(ii)
Level sl Paper 2 Time zone TZ2
Command term Draw, Label Question number e(ii) Adapted from N/A
e(ii).
[Maximum mark: 2]
22M.2.sl.TZ2.4e(ii)

Carbon forms many compounds.

Chlorine reacts with methane.

CH4 (g) + Cl2 (g) → CH3Cl (g) + HCl (g)

(e(ii))

Draw and label an enthalpy level diagram for this reaction.

[2]

Markscheme

reactants at higher enthalpy than products ✔


ΔH/-99 «kJ» labelled on arrow from reactants to products
OR
activation energy/Ea labelled on arrow from reactant to top of energy profile ✔

 

Accept a double headed arrow between reactants and products labelled as ΔH for M2.

Examiners report

The majority of candidates drew the enthalpy level diagram and labelled it correctly based on their answer to part (i). Some candidates reversed the products and reactants. A few candidates did not add any labels which prevented the awarding of the second mark. With 2 marks allocated to the question the second mark was awarded for correct labeling of either ΔH or Ea.

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