Sec 3 and Sec 4 · 17 papers
O-Level Pure Chemistry prelim papers, free with answers
17 Chemistry papers set by 12 Singapore secondary schools in 2023: 17 for Sec 4. 17 are Sec 4 prelim exams, and 14 come with answers. They prepare for O-Level Chemistry (6092) in 2026 and SEC G3 Chemistry (K324) from 2027.
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Catholic High
Cedar Girls' Paper 2
East Spring
Pasir Ris Paper 2
ACS (Barker Road)
Anderson
Broadrick
Greendale
Jurongville
Maris Stella High
Seng Kang
Yishun TownThe Chemistry exam these papers prepare for
The papers were set for O-Level Chemistry (6092) in 2026 and SEC G3 Chemistry (K324) from 2027. SEAB's scheme of assessment is the same for both years:
| Paper | Type | Time | Marks | Weighting |
|---|---|---|---|---|
| Paper 1 | Multiple choice, 40 questions | 1 h | 40 | 30% |
| Paper 2 | Structured and free response | 1 h 45 min | 80 | 50% |
| Paper 3 | Practical | 1 h 50 min | 40 | 20% |
A copy of the Periodic Table is printed in Paper 1. In Paper 2, Section A carries 70 marks of structured questions, and the last two carry 20 marks, one of them data-based.
Source: SEAB, O-Level Chemistry 6092 (2026) and SEAB, SEC G3 Chemistry K324 (2027).
Which topics do these papers test most?
Counted from the topics listed on each paper's page: how many papers test each topic. A topic that shows up in most papers is worth revising first.
| Topic | Papers |
|---|---|
| Mole concept | 17 of 17 |
| Chemical bonding and structure | 16 of 17 |
| Acids, bases and salts | 16 of 17 |
| Metals and the reactivity series | 16 of 17 |
| Rate of reaction | 16 of 17 |
| Redox | 15 of 17 |
| Electrolysis | 15 of 17 |
| The Periodic Table | 15 of 17 |
| Energy changes | 15 of 17 |
| Organic chemistry | 15 of 17 |
| Atomic structure | 14 of 17 |
| Experimental chemistry and separation | 13 of 17 |
Linked topics have a free study guide with a worked example and practice questions.
How to use Chemistry papers well
- Balance every equation with state symbolsEquations run through almost every topic, and a missing state symbol can cost the mark.
- Drill mole calculations until they are routineThe mole concept appears in nearly every paper here, often inside a longer question on another topic.
- Learn the qualitative analysis notesThe notes are printed only in the practical paper, so the tests for ions and gases in Papers 1 and 2 have to be recalled.
Questions about these papers
Are these Chemistry papers still good practice for the 2027 SEC?
Yes. The final O-Level is in October and November 2026, and from 2027 Sec 4 students sit the Singapore-Cambridge Secondary Education Certificate (SEC). SEAB's 2027 G3 syllabus sets the same papers, marks and timings as the 2026 O-Level syllabus, so school papers set for the O-Level are close practice for G3. Check any topic you are unsure of against the current syllabus.
Do the Chemistry papers come with answers?
14 of the 17 come with answers, as a separate PDF so the paper can be tried first. 13 of those are the school's own answer key, and the rest were typed by an unofficial source, which the paper's page says because we have not checked them. Pasir Ris 2023 Sec 4 Paper 2, Anderson 2023 Sec 4 Prelim and Pasir Ris 2023 Sec 4 Paper 1 have no answers yet.
Does the Chemistry exam give a Periodic Table?
Yes. SEAB prints a copy of the Periodic Table in Paper 1 of O-Level 6092 and SEC G3 K324. The qualitative analysis notes are printed only in Paper 3, the practical paper.
Are the papers free?
Yes. Enter your email and mobile once, and every paper on this site then downloads straight away on that device.