IB past paper analysis
Chemistry HL
May 2025 · Paper 2 · TZ1
See what this paper tests, focus on the skills that carry the marks, and practise matched Exam Vault questions with AI marking.
- 8questions
- 90marks
- 56question parts
- 39micro-topics
Mark distribution
- Reactivity 3: What are the mechanisms of chemical change?23%
- Reactivity 2: How much, how fast and how far?21%
- Structure 2: Models of bonding and structure16%
- Structure 3: Classification of matter16%
- Structure 1: Models of the particulate nature of matter13%
- Reactivity 1: What drives chemical reactions?11%
Hardest areas (by marks)
- 1.Factors affecting rate and the Maxwell–Boltzmann distribution4 marks
Question types
- show that / prove23%
- explain / justify16%
- find / solve14%
- outline13%
23% of parts are show / prove.
Questions in this paper
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Explore topic pages
Every micro-topic in this paper, with its exam pattern and practice.
Browse Chemistry HL topicsPredicted questions
The likely question types in the next sitting, from the same data.
Predicted Paper 2Good to know
Can I download Chemistry HL May 2025 TZ1 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 TZ1 Paper 2?
Reactivity 3: What are the mechanisms of chemical change? 23% (typical 19%), Reactivity 2: How much, how fast and how far? 21% (typical 22%), Structure 2: Models of bonding and structure 16% (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.