IGCSE Chemistry 0620 — March 2023 Past Papers, Topics & Exam Tips
The Cambridge IGCSE Chemistry (0620) March 2023 session consisted of 6 papers, covering 14 syllabus topics across all papers. This page links to every question paper, mark scheme, grade threshold and session feedback document released by Cambridge for this session, together with a topic-level breakdown of what was tested and topic-matched exam tips in our own voice.
Study Resources for Chemistry
Prepare for your exam with these complementary resources:
Jump straight to the topics this session tested most:
0620 March 2023 Papers
0620 Paper 1 - Multiple Choice (Core)
45 min • 40 marks
Tests broad syllabus knowledge with 40 questions. Each question has four options (A-D). Core tier paper.
0620 Paper 2 - Multiple Choice (Extended)
45 min • 40 marks
Extended tier multiple choice with more challenging questions covering the full syllabus. 40 questions, 45 minutes.
0620 Paper 3 - Theory (Core)
1 hr 15 min • 80 marks
Structured and free-response questions testing understanding and application. Core tier, grades available C-G.
View syllabus topics tested in Paper 3 (8 topics, 80 marks total)
This 0620 Paper 3 from March 2023 tests 8 different syllabus topics. The highest-weighted topic is Corrosion (Metals) worth 14 marks out of 80 total marks. Other significant topics include Alcohols (13 marks) and Hydrogen-oxygen fuel cells (11 marks).
Mark distribution by topic:
Understanding which topics carry the most marks helps you prioritize your Chemistry revision. Practice questions from high-mark topics like Corrosion to maximize your score.
0620 Paper 4 - Theory (Extended)
1 hr 15 min • 80 marks
Extended tier theory paper with more demanding questions. Full grade range A*-G available with this paper.
View syllabus topics tested in Paper 4 (5 topics, 80 marks total)
This 0620 Paper 4 from March 2023 tests 5 different syllabus topics. The highest-weighted topic is Reversible reactions and equilibrium (Chemical reactions) worth 18 marks out of 80 total marks. Other significant topics include Transition elements (18 marks) and Formulae (17 marks).
Mark distribution by topic:
Understanding which topics carry the most marks helps you prioritize your Chemistry revision. Practice questions from high-mark topics like Reversible reactions and equilibrium to maximize your score.
0620 Paper 5 - Practical Test
1 hr 15 min • 40 marks
Tests practical skills including planning experiments, recording data, and drawing conclusions from results.
View syllabus topics tested in Paper 5 (2 topics, 40 marks total)
This 0620 Paper 5 from March 2023 tests 2 different syllabus topics. The highest-weighted topic is Calculations (Stoichiometry) worth 18 marks out of 40 total marks. Other significant topics include Identification of ions and gases (16 marks)
Mark distribution by topic:
Understanding which topics carry the most marks helps you prioritize your Chemistry revision. Practice questions from high-mark topics like Calculations to maximize your score.
0620 Paper 6 - Alternative to Practical
1 hr • 40 marks
Written paper testing practical skills through questions about experimental methods, data, and analysis.
View syllabus topics tested in Paper 6 (3 topics, 40 marks total)
This 0620 Paper 6 from March 2023 tests 3 different syllabus topics. The highest-weighted topic is Calculations (Stoichiometry) worth 18 marks out of 40 total marks. Other significant topics include Identification of ions and gases (9 marks) and Rate of reaction (7 marks).
Mark distribution by topic:
Understanding which topics carry the most marks helps you prioritize your Chemistry revision. Practice questions from high-mark topics like Calculations to maximize your score.
Topic coverage in March 2023
Marks in this session were weighted unevenly across the 14 syllabus topics, with the heaviest emphasis on Calculations. Substantial weight also fell on Group I - Alkali metals and Identification of ions and gases , with Reversible reactions and equilibrium and Transition elements rounding out the five most-tested areas. Together these five topics made up about 54% of the topic-level marks awarded in the March 2023 session — a useful signal for where to focus revision time. The full topic-by-paper breakdown is further down the page.
Exam tips for topics in March 2023
- → Calculations: Always use mass numbers (bigger number) to calculate relative formula mass (Mr) — the sum of the atomic masses in the formula.
- → Group I - Alkali metals: Groups are the vertical columns, while periods are the horizontal rows — picture a 'group' of people standing tall, and a 'period' at the end of a horizontal sentence.
- → Identification of ions and gases: List out the common gases (O2, N2, CO2, NH3, Cl2, etc.) and note their distinctive physical and chemical properties.
- → Reversible reactions and equilibrium: In limiting reactant problems, identify the limiting reactant first, and use *its* moles for subsequent calculations.
- → Transition elements: For composition comparisons, name specific elements, not just general trends.
Other Resources
Additional materials to help you prepare and understand how exams are marked.
What was tested on each paper — 0620 March 2023
Here's which syllabus topics appeared in each of the 6 Chemistry 0620 papers in March 2023 and how the marks broke down. Focus your revision on the papers you're sitting — Papers 1, 3 and 5 or 6 for Core tier; Papers 2, 4 and 5 or 6 for Extended tier. Click any topic below to jump straight to our revision notes, or browse the full Chemistry 0620 revision guide →.
Paper 3 — Theory (Core) · 80 marks total
Tested 8 topics. The heaviest-weighted were Corrosion (14m), Alcohols (13m), Hydrogen-oxygen fuel cells (11m), Electrolysis (11m), Reactivity series (10m) and Group I - Alkali metals (10m), plus 2 other topics.
Paper 4 — Theory (Extended) · 80 marks total
Tested 5 topics. The heaviest-weighted were Reversible reactions and equilibrium (18m), Transition elements (18m), Formulae (17m), Group I - Alkali metals (16m) and Air and air quality (11m).
Paper 6 — Alternative to Practical · 40 marks total
Tested 3 topics. The heaviest-weighted were Calculations (18m), Identification of ions and gases (9m) and Rate of reaction (7m).
0620 March 2023 at a glance
- Papers: 6
- Topics covered: 14
- Highest-weighted topic: Calculations
- Grade thresholds: released by Cambridge (linked above)
- Session feedback: Cambridge report available
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0620 Study Tips & FAQ
What are paper variants?
Cambridge releases multiple variants of each paper (e.g., Paper 11, 12, 13) to accommodate different time zones around the world and maintain exam security.
Which variant you sit is set by your school's administrative zone: in the November 2026 timetable, for 0620, Variant 1 is sat in Zones 1 and 2, Variant 2 in Zones 3 and 4, and Variant 3 in Zones 5 and 6. Which zones sit which variant differs from subject to subject, so ask your exams officer which zone your school is in.
All variants cover the same syllabus and have similar difficulty. Practice with any variant to prepare effectively for your exam.
How to use Mark Schemes effectively
Mark schemes show exactly how examiners award marks for each question. Understanding them helps you write answers that earn full marks.
Tips:
- Look for key words that must appear in your answer
- Note how many points are needed for each mark
- Check if units are required for the final mark
- Understand the difference between "state" (brief) and "explain" (detailed)
Understanding Grade Thresholds
Grade thresholds show the minimum marks needed for each grade. They vary each session based on paper difficulty — harder papers have lower thresholds.
March 2023, option BY (components 22, 42, 52), out of 200:
From the Cambridge grade threshold table, March 2023. Each option has its own thresholds: see every 0620 session.
How to use thresholds:
- Set realistic target marks based on your goal grade
- Track your practice paper scores against thresholds
- Remember: you don't need 100% for an A* — aim for consistency
- Compare thresholds across sessions to gauge difficulty trends
How is the topic breakdown calculated?
The "Topics Breakdown by Paper" section above shows which syllabus topics are tested in each paper and how many marks they carry. Here's how we calculate this:
Our methodology:
- Extract questions: We analyze each question paper (QP) and identify individual questions and their mark allocations (shown in square brackets, e.g., [3]).
- Match to syllabus: Each question is matched to the official Cambridge 0620 syllabus topics based on keywords, concepts, and question content.
- Sum marks per topic: For each paper, we add up the marks for all questions testing the same topic. For example, if Q1 (4 marks) and Q5b (3 marks) both test the same topic, that topic shows as "7 marks" for that paper.
How to use this: Look at the paper(s) you'll be taking (e.g., Papers 2, 4 and 5 or 6 for Extended tier). The topics with the highest marks in YOUR papers are where you should focus your revision. A topic worth 15 marks deserves more study time than one worth 3 marks.
Note: Our topic matching may be inaccurate for questions that span multiple topics. Use this as a guide alongside the official syllabus.
How to Use IGCSE Chemistry Past Papers
📝 Timed Practice
Complete papers under exam conditions. 0620 Paper 4 (Theory, Extended) is 1 hr 15 min - practice finishing within this time to build exam stamina.
✅ Self-Marking
Use the mark scheme to score your answers. Look for marking points you missed and understand what examiners expect in Chemistry responses.
📊 Examiner Reports
Read the 0620 examiner report to see common mistakes. Focus revision on topics where candidates typically lose marks.
🎯 Grade Targets
In March 2023, an A* in IGCSE Chemistry needed 157 to 158 out of 200 (79%) on the Extended options, depending on the option (Cambridge grade threshold table, March 2023). See the grade thresholds for every 0620 session.
Frequently Asked Questions
Where can I download IGCSE Chemistry March 2023 past papers?
Are 0620 mark schemes included?
What papers are available for IGCSE Chemistry 0620?
What is the difference between paper variants 11, 12, and 13?
How can I practice these past papers effectively?
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