Cambridge IGCSE · Analysis & Prediction

2025 Cambridge IGCSE Chemistry (0620) Past Paper: Analysis & Answers

The October/November 2025 Chemistry (0620) examination series demonstrates a balanced distribution of marks across fundamental, organic, and quantitative domains. It reinforces experimental design and precision calculations as critical differentiators between grade bands.

Updated: Jun 13, 2026

AnalysisSample paper

Difficulty 3.2/5

Total marks

160

Duration

180 mins

Most tested

—

Paper breakdown

Paper 2 Multiple Choice (Extended): 40 marks · 45 minsPaper 4 Theory (Extended): 80 marks · 75 minsPaper 6 Alternative to Practical: 40 marks · 60 mins

Examiner insights

Official report

Common pitfalls

Incorrect stoichiometry when calculating reactants: e.g. failing to divide/multiply moles of hydrochloric acid by 2 in its 1:2 reaction with magnesium.
Misreading burette scales from top-to-bottom instead of bottom-to-top, leading to completely inverted value deductions.

Misconceptions

Believing that catalysts alter the overall enthalpy change or shift the final equilibrium position of a reversible reaction rather than merely increasing the forward and backward rates equally.

Where marks are lost

Omitting key observations during active reactions (e.g., missed mentioning the rapid dissolution of a metal or the specific color shifts of methyl orange).
Losing track of state symbols when completing balance sheets for neutralisation pathways.

Estimated grade boundary

Updated: Jun 13, 2026

Source: Cambridge IGCSE grade thresholds (official)

Grade	Mark	Percentage
A*	158/200	79%
A	132/200	66%
B	106/200	53%
C	80/200	40%
D	67/200	34%
E	54/200	27%

Official grade boundaries published by Cambridge IGCSE grade thresholds (official).

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