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IGCSE Chemistry 0620 Paper 6: Observations, Readings and Errors
Chemistry: the practical alternative
This paper needs no laboratory, but it marks you as if you had done the practical: observations must name colour, precipitate, smell and gas-test result; readings must name the apparatus and unit; errors must name a cause and an improvement.
How is IGCSE Chemistry 0620 Paper 6 assessed, and what does each part carry?
Paper 6 (Alternative to Practical): All compulsory, testing practical and analytical skills (20%); Paper 4 (Theory, Extended): 80 marks (50%); Paper 2 (Multiple Choice, Extended): 40 marks (30%); Paper 5 (Practical Test): 40 marks, alternative to Paper 6 (20%)
Assessment at a glance (2027)
| Component | Content | Weighting | Duration |
|---|---|---|---|
| Paper 6 (Alternative to Practical) | All compulsory, testing practical and analytical skills | 20% | 1 h 15 min |
| Paper 4 (Theory, Extended) | 80 marks | 50% | 1 h 15 min |
| Paper 2 (Multiple Choice, Extended) | 40 marks | 30% | 45 min |
| Paper 5 (Practical Test) | 40 marks, alternative to Paper 6 | 20% | 1 h 15 min |
IGCSE Chemistry 0620 Paper 6 drilling technique: decide which titres are concordant before averaging; give burette readings to two decimal places (0.05 cm^3); in qualitative analysis write the three steps – what is added, what is seen, which ion is deduced; in mole calculations write the equation and the mole ratio before substituting numbers and remember to convert cm^3 to dm^3 (divide by 1000); describe observations precisely (colour, whether a precipitate dissolves) rather than by smell.
What each paper is actually testing
| Paper | Drill focus | How marks are lost |
|---|---|---|
| Paper 6 (Alternative to Practical) | readings, significant figures, units | “Bubbles” is written with no gas test, so the observation earns half. |
| Paper 4 (Theory, Extended) | equations, moles, explanations | The test is named but its result is not, so “lighted splint” appears without “a pop is heard”. |
| Paper 2 (Multiple Choice, Extended) | formulae, periodicity, practical | The titration gives only a final volume, with no start and end readings, unit or decimal places. |
| Paper 5 (Practical Test) | hands-on work, recording, safety | Every error question says “human error” without naming the step or the improvement. |
What is each IGCSE Chemistry 0620 Paper 6 paper really testing, and what should you drill?
Paper 6 (Alternative to Practical): readings, significant figures, units; Paper 4 (Theory, Extended): equations, moles, explanations; Paper 2 (Multiple Choice, Extended): formulae, periodicity, practical; Paper 5 (Practical Test): hands-on work, recording, safety
Drill order: by topic, then by year, then the mark scheme
| Step | What you do | Why |
|---|---|---|
| 1. By topic | Work through each topic, starting with the paper that allows least help (no calculator / closed book) | Exposes what is genuinely not understood |
| 2. By year | Whole papers to time, one or two a week | Trains pace, stamina and question selection |
| 3. Mark scheme | Go through the marking scheme question by question and log the scoring steps you missed | Most lost marks are written wrong, not thought wrong |
Should drilling go by topic first or by year?
By topic first, then whole papers by year, then the mark scheme. The first third of the time goes topic by topic (8-10 years of the same topic back to back), the middle switches to timed whole papers, and the last fortnight only redoes the recurring errors from your log.
A 12-week drilling timetable
| Week | Phase | What to do |
|---|---|---|
| Weeks 1-3 | By topic: foundation | Topic by topic, starting with the easiest marks, building habits and recall |
| Weeks 4-6 | By topic: core | 8-10 years of the same topic back to back, errors classified by topic |
| Weeks 7-8 | By topic: advanced and electives | Elective and higher-order topics, now under time pressure |
| Weeks 9-10 | By year: timed papers | One full paper a week, timed, no reference materials |
| Week 11 | Mark scheme work | Question by question against the marking scheme; list the scoring steps you omitted |
| Week 12 | Plug holes and simulate | Only the recurring errors from your log, then one full exam simulation |
Subject-specific weighting for this timetable: Weeks 1-3: observations only. Build one table of gas tests, ion precipitate colours and metal-acid changes, and check every answer against it, forcing colour and precipitate names.
Weeks 4-6: readings and apparatus. Ten questions each on titration, measuring cylinder and thermometer, always with start, end, difference, unit and decimal places.
Weeks 7-9: errors and improvements, one specific error paired with one workable improvement.
Weeks 10-12: full papers to time, five minutes at the end to check units and decimal places.
Use it properly: this is not a checklist to finish. Every week must keep time for redoing errors, or from week 9 you will be repeating the same batch.
Pacing
| Paper | Time | Suggested split |
|---|---|---|
| Paper 6 (Alternative to Practical) | 1 h 15 min | 15-18 min a question; readings and calculations first |
| Paper 4 (Theory, Extended) | 1 h 15 min | do equations and mole calculations first |
| Paper 2 (Multiple Choice, Extended) | 45 min | about a minute a question; calculations and practical items first |
| Paper 5 (Practical Test) | 1 h 15 min | read the reagent notes and instructions first, then record observations as you go |
How should the time be split inside each IGCSE Chemistry 0620 Paper 6 paper?
Paper 6 (Alternative to Practical): 15-18 min a question; readings and calculations first; Paper 4 (Theory, Extended): do equations and mole calculations first; Paper 2 (Multiple Choice, Extended): about a minute a question; calculations and practical items first; Paper 5 (Practical Test): read the reagent notes and instructions first, then record observations as you go
The drilling mistakes that cost the most marks
| Mistake | What it looks like | What actually happens | Instead |
|---|---|---|---|
| Averaging all titres | Using every titre | The mean drifts | Average only the concordant titres |
| Too few decimal places | Writing 23.8 cm^3 | Marks deducted | Write 23.80 cm^3 |
| Vague observation | ‘A precipitate formed’ | No deduction marks | Colour and whether it dissolves |
| Forgetting the unit conversion | Using 250 cm^3 directly | Concentration ten times out | Divide by 1000 to get dm^3 |
The error log and the mark scheme
Three columns: the answer as written, the key words the scheme wants (colour, precipitate name, gas-test result, unit), and which was missing. Put the most frequent gap on the first page of your notes.
How many years should you drill?
The specification and paper codes have changed, so older papers do not always match current question types: build the three answer types on three to five years of current papers, then fill gaps with the official specimen and your own lab reports.
How many years of past papers is enough?
The specification and paper codes have changed, so older papers do not always match current question types: build the three answer types on three to five years of current papers, then fill gaps with the official specimen and your own lab reports.
Frequently asked questions
Is this page a mock paper or a drilling guide?
This is the IGCSE Chemistry 0620 Paper 6 drilling guide: assessment structure, drill order, a 12-week timetable, pacing, common mark losses and the error-log method. For questions with answers, use the IGCSE Chemistry 0620 Paper 6 mock papers linked under Related.
By topic or by year first?
By topic. Eight to ten years of the same topic back to back is what exposes repeating errors; going straight to whole papers just repeats the same batch under time pressure.
How should the error log be written?
Do not copy out questions. Per error record four things: question reference, which step failed (concept, wording, calculation), what the mark scheme requires, and the correct action next time.
I have never done the practical, so can I answer observation questions?
Yes, because observations are standard descriptions: gas tests and ion colours are fixed answers. Learn that table plus the no-visible-change exception.
Is “apparatus error” enough for an error question?
Usually not: name the apparatus, say which way it pushes the reading, and give a workable improvement.
Official references
| Resource | What to use it for |
|---|---|
| Cambridge IGCSE Chemistry 0620 page | Confirm the paper marks, times and weightings |
| https://www.tutorzone.com.hk/en-igcse-chemistry-0620-paper-4-mock-2027/ | IGCSE Chemistry Paper 4 drilling mock |
Related: practice area · IGCSE Chemistry Paper 4 drilling mock · IGCSE Physics Paper 6 drilling mock
Next step: find a tutor / register as a tutor
After drilling, the hard part is telling a conceptual error from a writing error. Tell us the year group, the school and your available times, and TutorZone will match you with a tutor who knows the HKEAA assessment requirements.
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