In Classes 9 and 10, the chemistry practical examination carries real marks — and in many BISE boards, students lose those marks not because they cannot do chemistry, but because their school never ran the practicals properly. Meanwhile the same practicals involve acids, heating, and glassware: real hazards in a room of teenagers. Planning chemistry practicals well means handling both truths at once — every experiment aligned to the board's practical list, every session safe, and every student walked into the viva prepared.
This guide covers the complete planning cycle: the BISE-aligned experiment list, exactly what quantities to buy and what they cost, the safety checks that precede every session, a period structure that keeps forty students safe and productive, viva preparation that actually lifts marks, and the notebooks and records examiners expect to see.
The Experiment List: Aligned to the BISE Practical
Start from the board's practical notebook requirements, not from the textbook chapters. Across Pakistani BISE boards, the Class 9–10 chemistry practical syllabus centres on a stable set of experiments: preparation and properties of common gases (hydrogen, oxygen, carbon dioxide); acid-base titrations and indicators; qualitative analysis — identifying cations and anions through systematic tests; separation techniques (filtration, crystallisation, sublimation, chromatography); electrochemistry basics (electrolysis of water); rates of reaction; and tests for water hardness and purity. Your school's list should mirror the board's list exactly — an experiment not on the board's list is enrichment; an experiment on the board's list that you skipped is a gap in marks.
Sequence the year's practicals to match the theory teaching: run the gas preparation practicals when the class studies gases, the titration practicals during the acids-and-bases chapter, and so on. The practical then reinforces the theory the same week, and the student writes the practical notebook while the concept is fresh. Publish the year's practical calendar at the start of the session — experiment, date, and the theory chapter it pairs with — so teachers, students, and the lab assistant all work from one plan. And check the board's current practical guidelines each year; boards occasionally revise the notebook format or the viva weightage, and the plan must follow the board, not last year's habit. For general exam strategy, see our board exam preparation guide.
Quantities and Budget: Buying Exactly What You Need
Schools waste money on chemistry in two ways: buying far too much (a litre of concentrated acid when the practical needs millilitres) and buying too little of the consumables that actually get used up (filter paper, litmus, distilled water). The fix is to calculate per-student quantities for the year's experiment list, multiply by the number of students, and add 20% for spillage and repeats. Example: if the titration practical uses 10 ml of dilute acid per student and you have 60 students doing it twice, you need about 1.5 litres of dilute solution — which you prepare from a small bottle of concentrate, not by buying litres of concentrate.
A realistic annual chemistry consumables budget for a school with 60–80 science students: common acids and bases in small bottles (Rs. 3,000–5,000), salts for qualitative analysis (Rs. 2,000–3,000), indicators — litmus, phenolphthalein, methyl orange (Rs. 1,000–1,500), filter paper and litmus paper (Rs. 1,500–2,000), distilled water (Rs. 1,000), glassware replacement — test tubes and beakers break (Rs. 3,000–5,000), and spirit lamp fuel (Rs. 1,000–1,500). Total: roughly Rs. 12,000–20,000 a year — a modest, plannable line in the science budget, not the frightening figure principals imagine. Buy from a reputable chemical supplier, keep purchase receipts, and never buy from unknown sources to save a few rupees — purity matters in qualitative analysis, and a contaminated reagent produces wrong results that confuse students.
The Quantity Rule
Safety Checks Before Every Session
Every chemistry practical period begins before the students arrive. The teacher or lab assistant runs a five-minute check: the first-aid kit is stocked and the eye-wash bottle is full; the fire blanket and extinguisher are in place; only the chemicals for today's experiment are on the benches, pre-dispensed in labelled containers — stock bottles stay locked away; glassware is intact (chipped beakers and cracked test tubes are removed, not used); spirit lamps are filled correctly and extinguishers of flame (covers) are at hand; and the room is ventilated — windows open when gases are involved.
The pre-dispensing habit is the single most important safety practice in school chemistry: students never handle stock bottles, never pour from large containers, and never guess at quantities. The teacher prepares measured amounts — the titration burettes filled, the test tubes with the right salt samples, the droppers of indicator — and the period runs on those. It takes fifteen to twenty minutes of preparation; it removes the accidents that make headlines. This is part of the school's wider safety culture — see our emergency alert system guide for how lab safety connects to building-wide planning.
Running the Practical: The Period Structure That Works
A chemistry practical period with forty students needs choreography. First ten minutes — briefing: the teacher demonstrates the experiment at the front bench while students watch — the exact steps, the safety points ("the test tube mouth points away from everyone"), and what a correct result looks like. Never skip the demonstration; students who have seen it done make fewer dangerous improvisations. Next twenty-five minutes — supervised work: students work in pairs (never larger groups — pairs keep both students active), following the demonstrated steps, while the teacher circulates constantly. Circulation is the safety system: a teacher who walks the benches spots the wrong grip, the overfilled tube, the horseplay, before it becomes an incident.
Last five minutes — clean-up and recording: apparatus washed and returned, benches wiped, waste disposed in the designated containers (never down the sink for chemical waste — keep separate waste bottles), hands washed, and observations written in the notebook while fresh. Pair work deserves emphasis: in pairs, both students handle apparatus; in groups of four, two watch. And keep a strict rule — no experiment runs without the teacher's eyes on the bench. A practical period where the teacher sits at the desk marking papers is not a practical; it is an accident waiting for a period to happen in.
Viva Preparation: Where the Marks Are Won
The practical viva — the examiner's questions — is where prepared students pull ahead, because most students rehearse the experiments but never rehearse the questions. Build viva prep into the year, not the week before the exam. After every practical, the teacher asks each pair three viva-style questions: what did you do, why does it work (the principle), and what would change if you altered one variable. Students answer aloud, in complete sentences. By year's end, every student has answered dozens of viva questions — the exam viva feels like routine.
The questions examiners actually ask fall into patterns: the principle behind the experiment ("why does the indicator change colour at the end point?"), the precautions ("why do we rinse the burette with the solution?"), the observations ("what did you see when the gas evolved?"), and the variations ("what if you used a stronger acid?"). Compile the school's own viva question bank — twenty questions per experiment, collected from past papers and examiner reports — and drill it in the final month. Two mock vivas per student, with a teacher playing examiner, remove the fear: the student who has been asked "explain your titration" twice already will answer it calmly the third time. And remind students of the viva's golden rules: answer what was asked, say "I don't know" honestly rather than inventing, and refer to their own notebook — the examiner respects a student who did the work.
Practical Notebooks and Records That Examiners Respect
The practical notebook is examined, so treat it as an exam document from day one. Each experiment's write-up follows the board's format: aim, apparatus and chemicals, theory or principle, procedure, observations, result, and precautions — in the student's own handwriting, written up promptly after the practical (memories fade; a notebook written a month later is fiction). The teacher checks and signs each write-up within the week, correcting errors while the experiment is still fresh in the student's mind.
Common notebook failures to prevent: copied procedures (every student's observations should reflect what they actually saw — identical observations across thirty notebooks signal copying, and examiners notice); missing precautions (the precautions section is often explicitly marked); and diagrams drawn carelessly (a labelled diagram of the gas preparation apparatus, drawn with a ruler, earns its marks). Keep the notebooks in school, in the lab cupboard, collected after each write-up — notebooks that go home get lost, damaged, or "completed" by someone else. At the year's end, the notebook file is complete, signed, and ready — and the student's viva answers match their own written record. Marks for practicals are recorded alongside theory in the school's exam management system, and the final practical grades feed the grading system parents see on the report card.
AI Help: Muse AI
Muse AI is Meta's personal AI assistant, available in the Muse app. It can help you plan your practicals — for example, drafting the year's experiment calendar, calculating chemical quantities for your enrolment, or building a viva question bank for each experiment.
Join Muse with invite code LTGSWD — in the Muse app, go to Settings > Redeem token and enter the code.
Disclosure: LTGSWD is the author's Muse invite code.