Required practicals: a GCSE chemistry revision checklist

Ask a Year 11 class to list what they’re revising for chemistry and you’ll hear bonding, moles, maybe electrolysis if they’re feeling brave. Almost nobody says “the required practicals” - even though at least 15% of GCSE marks assess practical knowledge and skills, and practical contexts leak into far more questions than that.

The good news: practical questions are among the most predictable on the paper. Examiners can only ask so many things about a titration. Treat each practical as a small bundle of learnable facts and rehearsable skills, and it becomes some of the highest-value revision your students can do.

Which practicals are we talking about?

AQA names eight required practicals for GCSE Chemistry (fewer for Combined Science: Trilogy, which drops titration and identifying ions). Edexcel covers near-identical ground through its core practicals, and OCR through practical activity groups (PAGs). The chemistry is the same everywhere:

• Making a pure, dry soluble salt
• Titration (separate chemistry)
• Electrolysis of aqueous solutions
• Temperature changes in reacting solutions
• Rates of reaction - turbidity and gas collection
• Paper chromatography
• Identifying ions (separate chemistry)
• Water purification and analysis

Whichever board you teach, check your specification’s exact list - then apply the same checklist to each one.

The six-point checklist

For every practical, a student who can do the following six things is ready for anything the paper asks:

1. Recall the method in six steps or fewer. Not the full lab sheet - the skeleton. If they can’t say it in six steps, they don’t know it yet.
2. Name the variables. Independent, dependent, and the two or three control variables that matter. “Keep everything the same” scores nothing.
3. Justify the apparatus. Why a volumetric pipette and not a measuring cylinder? Why a gas syringe rather than counting bubbles? Apparatus questions are really resolution-and-accuracy questions in disguise.
4. Predict the results. What does a correct graph or data table look like, and what shape or pattern should they expect?
5. Do the attached maths. Every practical drags a calculation behind it - see below.
6. Evaluate it. One systematic error, one random error, and one genuine improvement (not “do it more carefully”).

The maths that hides in each practical

Practical questions are where the exam boards love to land their maths marks, because the context is guaranteed to be familiar. Worth drilling explicitly:

• Rates: gradients and tangents on volume–time graphs, and mean rate = quantity ÷ time.
• Titration: concordant results, mean titres, and the full concentration calculation for separate chemists.
• Temperature changes: reading thermometers to the correct resolution and interpreting energy-change graphs.
• Chromatography: R_f values - measuring to the centre of the spot, and knowing why R_f has no units.
• Electrolysis: writing half-equations at each electrode - and being able to say why hydrogen appears at the cathode instead of sodium.

The traps students fall into

Three patterns come up in mock after mock:

They describe the wrong practical. Asked about temperature changes, they write up the rates method they remember better. Insist students name the practical to themselves before writing a word.

They memorise the method but can’t transfer it. Exam questions routinely dress a required practical in an unfamiliar context - a different acid, a strange indicator, an apparatus diagram drawn sideways. Practise spotting the underlying practical inside the costume.

Their evaluations are vague. “Human error” and “use better equipment” earn nothing. Train the pattern: name the error, state its direction, link it to the result.

Turning this into revision lessons

The checklist works best as retrieval, not re-teaching. A format that works well: five minutes of rapid recall on one practical (our Rapid Recall sets cover each one), ten minutes of exam-style questions, five minutes of self-marking against a worked answer pack - then rotate to the next practical next lesson. Over three weeks a class covers all eight practicals twice.

If you’d rather not assemble that yourself, the resource library has worksheets, exam-style question packs and misconception resources for every required practical, all with worked answers - and Toolkit AI will build a timed revision lesson around any practical if you tell it which one your class finds hardest.

However you run it, start now rather than in May. Practical marks are the most learnable marks on the paper - they just need to be treated as content, not as a memory of something students did once in Year 10.