IB past paper analysis

Chemistry SL
November 2025 · Paper 1 · TZ1

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  • 30questions
  • 55marks
  • 44question parts
  • 31micro-topics

What this paper tests

Mark distribution

  • Structure 1: Models of the particulate nature of matter29%
  • Reactivity 2: How much, how fast and how far?20%
  • Reactivity 1: What drives chemical reactions?18%
  • Structure 2: Models of bonding and structure14%
  • Reactivity 3: What are the mechanisms of chemical change?11%
  • Structure 3: Classification of matter7%

Hardest areas (by marks)

    Question types

    identify: 68%find / solve: 14%explain / justify: 11%show that / prove: 5%5%
    • identify68%
    • find / solve14%
    • explain / justify11%
    • show that / prove5%

    5% of parts are show / prove.

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    Questions in this paper

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    Where to go next

    Good to know

    Can I download Chemistry SL November 2025 TZ1 Paper 1 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 November 2025 TZ1 Paper 1?

    Structure 1: Models of the particulate nature of matter 29% (typical 20%), Reactivity 2: How much, how fast and how far? 20% (typical 26%), Reactivity 1: What drives chemical reactions? 18% (typical 10%).

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