Cambridge O Level Chemistry (5070) Paper 21, October/November 2025. Read the question paper free and work through it with an AI tutor that explains every question step by step.
| Exam board | Cambridge International Education |
|---|---|
| Qualification | Cambridge O Level |
| Subject | Chemistry |
| Syllabus code | 5070 |
| Paper | Paper 21 (5070/21) |
| Exam series | October/November 2025 · all 2025 papers |
| Questions | 10 |
| AI explanations | Available for every question |
The questions in this paper cover these Chemistry syllabus chapters:
| Topic | Questions |
|---|---|
| Chapter 7: Acids, bases and salts | 1 |
| Chapter 8: The Periodic Table | 2 |
| Chapter 10: Chemistry of the environment | 2 |
| Chapter 11: Organic chemistry | 2 |
| Chapter 12: Experimental techniques and chemical analysis | 1 |
Every question in 5070 Chemistry Paper 21 — Oct/Nov 2025 and the syllabus topic it tests. Ask the AI tutor about any of them by number, for example "Question 1".
| Question | Topic |
|---|---|
| Question 1 | — |
| Question 2 | — |
| Question 3 | — |
| Question 4 | Chapter 8: The Periodic Table |
| Question 5 | Chapter 8: The Periodic Table |
| Question 6 | — |
| Question 7 | Chapter 11: Organic chemistry |
| Question 8 | Chapter 11: Organic chemistry |
| Question 9 | Chapter 7: Acids, bases and salts; Chapter 10: Chemistry of the environment; Chapter 12: Experimental techniques and chemical analysis |
| Question 10 | Chapter 10: Chemistry of the environment |
This paper tests 5 syllabus topics: Acids, bases and salts (1 question), The Periodic Table (2 questions), Chemistry of the environment (2 questions), Organic chemistry (2 questions), Experimental techniques and chemical analysis (1 question).
Yes. Open the paper on Aixampapers and ask the AI tutor about any question: it explains each one step by step, written to what Cambridge examiners give marks for.
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