O-Level Chemistry Practical: 2025–2026 Guide (Singapore)
Download printable cheat-sheet (CC-BY 4.0)30 Oct 2025, 00:00 Z
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TL;DR
Paper 3 is 1 h 50 min, 40 marks, and makes up twenty percent of your grade.
It samples seven experiment families, grades you on Planning, MMO, PDO, and ACE, and expects textbook technique — 0.05 cm³ burette readings, 1–2 cm³ qualitative-analysis aliquots, tidy sig. figs, and realistic evaluation fixes.
If you drill those habits now, the exam becomes a dress rehearsal rather than a surprise.
Train With the Experiments Hub
Pair this overview with the full set of practical walkthroughs inside the O-Level Chemistry Experiments hub so each experiment family listed below already has a matching rehearsal plan.
1 | Paper 3 at a glance
| Item | Details |
| Duration / marks | 1 h 50 min, 40 marks |
| Weighting | Twenty percent of overall Chemistry (6092) |
| Skill strands | Planning (P), Manipulation / Measurement / Observation (MMO), Presentation of Data / Observations (PDO), Analysis / Conclusions / Evaluation (ACE) — Planning contributes fifteen percent of Paper 3 |
| Reference material | Notes for Qualitative Analysis printed inside the paper; no other notes allowed |
| Calculators | Approved scientific calculators are allowed in every paper, including Paper 3 |
Key format, technique, and reference-material rules are summarised from SEAB’s 2025 and 2026 syllabuses (and your school will confirm any operational details like reporting times).
2 | What the examiners can set — the seven experiment families
Paper 3 questions draw from (and often combine) these core practical families. If you can execute all seven comfortably, the exam is just an application of rehearsed routines (SEAB 2025 syllabus).
