IB past paper analysis
Chemistry SL
May 2025 · Paper 1 · TZ1
See what this paper tests, focus on the skills that carry the marks, and practise matched Exam Vault questions with AI marking.
- 30questions
- 55marks
- 43question parts
- 29micro-topics
Mark distribution
- Structure 1: Models of the particulate nature of matter55%
- Reactivity 3: What are the mechanisms of chemical change?13%
- Structure 2: Models of bonding and structure11%
- Structure 3: Classification of matter9%
- Reactivity 2: How much, how fast and how far?9%
- Reactivity 1: What drives chemical reactions?4%
Hardest areas (by marks)
Question types
- identify40%
- find / solve26%
- explain / justify16%
- show that / prove7%
7% 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 SL topicsPredicted questions
The likely question types in the next sitting, from the same data.
Predicted Paper 1Good to know
Can I download Chemistry SL May 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 May 2025 TZ1 Paper 1?
Structure 1: Models of the particulate nature of matter 55% (typical 24%), Reactivity 3: What are the mechanisms of chemical change? 13% (typical 18%), Structure 2: Models of bonding and structure 11% (typical 15%).
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.