IB past paper analysis

Chemistry HL
May 2025 · Paper 2 · TZ3

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  • 10questions
  • 90marks
  • 47question parts
  • 37micro-topics

Mark distribution

  • Reactivity 2: How much, how fast and how far?24%
  • Reactivity 3: What are the mechanisms of chemical change?23%
  • Structure 2: Models of bonding and structure17%
  • Structure 3: Classification of matter14%
  • Reactivity 1: What drives chemical reactions?13%
  • Structure 1: Models of the particulate nature of matter8%

Hardest areas (by marks)

  1. 1.Nucleophilic substitution: SN1 and SN2 (HL)4 marks

Question types

find / solve: 23%write down / state: 21%explain / justify: 19%sketch: 15%9%
  • find / solve23%
  • write down / state21%
  • explain / justify19%
  • sketch15%

9% of parts are show / prove.

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Questions in this paper

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Explore topic pages

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Good to know

Can I download Chemistry HL May 2025 TZ3 Paper 2 here?

No. The paper and its mark scheme belong to the IB and are not reproduced. This page gives the structure of every question (marks, command term, micro-topic, the skill tested), the exam analysis, and practice questions we wrote to test the same skills. Subscribers can also open our summary of how each part's marks are awarded.

Which topics dominate May 2025 TZ3 Paper 2?

Reactivity 2: How much, how fast and how far? 24% (typical 22%), Reactivity 3: What are the mechanisms of chemical change? 23% (typical 19%), Structure 2: Models of bonding and structure 17% (typical 12%).

How do I practise this paper without the paper?

Press "Practise similar" on any question. We open questions matched by micro-topic, command term and mark range with model answers and AI marking, then bring you back here.