IB past paper analysis
Chemistry SL
May 2025 · Paper 1 · TZ2
See what this paper tests, focus on the skills that carry the marks, and practise matched Exam Vault questions with AI marking.
- 30questions
- 55marks
- 49question parts
- 27micro-topics
Mark distribution
- Structure 1: Models of the particulate nature of matter35%
- Reactivity 2: How much, how fast and how far?35%
- Reactivity 3: What are the mechanisms of chemical change?14%
- Structure 2: Models of bonding and structure7%
- Structure 3: Classification of matter6%
- Reactivity 1: What drives chemical reactions?4%
Hardest areas (by marks)
Question types
- identify35%
- find / solve25%
- explain / justify22%
- write down / state8%
6% of parts are show / prove.
Questions in this paper
Open a question to see what each part tests, how often that micro-topic comes up, and practise matched questions.
Want to practise the skills from this paper?
Open original Exam Vault questions matched by topic, marks and command term, with AI marking and step-by-step feedback.
Original Exam Vault questions with AI markscheme feedback for this topic.
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 TZ2 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 TZ2 Paper 1?
Structure 1: Models of the particulate nature of matter 35% (typical 24%), Reactivity 2: How much, how fast and how far? 35% (typical 26%), Reactivity 3: What are the mechanisms of chemical change? 14% (typical 18%).
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.