With the 2026 A-Level H2 Chemistry Paper 4 Practical approaching, one question keeps appearing among JC students:

What is likely to come out this year?

Predictions are tempting, especially in the final days before an examination. But guessing that “redox will come out” or “surely Cambridge won't repeat last year's experiment” is not particularly useful unless there is evidence behind it.

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So instead of starting with a prediction, I analysed the 2022, 2023, 2024 and 2025 H2 Chemistry Paper 4 papers and looked for patterns in what Cambridge has actually been testing.

Five trends stood out.

And only after looking at those trends did I make my prediction for the 2026 H2 Chemistry Practical.

First: What Does H2 Chemistry Paper 4 Actually Test?

Across the papers I analysed, the practical can broadly be organised into four areas:

Qualitative, Quantitative, Investigative and Planning — QQIP.

The quantitative component commonly involves titration. Qualitative work centres around observations and identification. Investigative work can involve areas such as kinetics or energetics, while planning requires students to design an experimental approach rather than simply execute one.

That framework matters because students sometimes revise Paper 4 as a random collection of experiments.

It is more useful to ask:

What experimental skill is Cambridge trying to test?

Once you start looking at Paper 4 that way, several patterns appear.

Trend 1: Reaction Kinetics Keeps Appearing

This is probably the clearest trend from the past four years.

Kinetics appeared in different forms:

• 2022: planning involving a clock reaction and activation energy

• 2023: a water-displacement investigation

• 2024: an iodine-clock style experiment

• 2025: kinetics appearing through planning

The exact experiment changed, but reaction kinetics remained present in some form throughout all four years.

That leads to an important warning.

Kinetics is not just “wait until the solution turns blue”

If your entire idea of practical kinetics is an iodine clock, you are too narrow.

You should be comfortable thinking about:

• concentration against time;

• rate measurement;

• sampling a reaction;

• temperature effects;

• gas-volume measurements;

• determining initial rate;

• extracting information from a graph.

Cambridge has already shown that it can change the experimental method while still testing the same underlying Chemistry.

What should you revise?

Do not memorise one kinetics procedure.

Understand how an experimental measurement can be converted into information about reaction rate.

That will make you much harder to surprise.

Trend 2: Titration Is No Longer Just About Getting a Titre

A second pattern appears in the quantitative experiments.

The experiment itself may involve titration, but the question does not stop when you obtain your concordant values.

Across recent papers, students have had to use their experimental result to determine something that was not measured directly.

Examples discussed in the analysis include:

• dilution followed by acid-base titrimetry;

• determining the amount of aspirin in a tablet;

• vitamin C analysis through multi-step redox chemistry;

• combining information from multiple titration reactions.

This is where otherwise strong students can lose a surprising number of marks.

They perform the practical correctly.

They obtain the correct titre.

Then the calculation becomes:

The skill Cambridge is repeatedly testing

You need to connect:

experimental measurement → mole relationship → quantity actually required

That may involve:

• dilution factors;

• aliquots;

• excess reactant;

• back calculation;

• redox stoichiometry;

• multi-step mole relationships.

  
  

If the calculation becomes confusing, drawing a simple diagram or model of what happened to the solution can help you keep track of where the moles came from and what was subsequently measured.

Before Paper 4

If redox or mole concept is still shaky, this is one of the areas I would prioritise.

A perfect practical technique cannot rescue a calculation you do not understand.

Trend 3: Graphs Keep Appearing

Students sometimes treat graphing as a minor practical skill.

The past four years suggest otherwise.

The graphs discussed in the analysis included:

• 2022: temperature against volume

• 2023: gas volume against time

• 2024: a logarithmic kinetics plot

• 2025: temperature against time with extrapolation.

The axes change.

The Chemistry changes.

The underlying requirement does not:

That could mean:

• calculating a gradient;

• interpreting the gradient;

• finding an intercept;

• estimating half-life;

• determining initial rate;

• extrapolating to obtain a corrected value.

Simply knowing how to draw a best-fit line is not enough.

A useful final check

Before the exam, make sure that when you see a graph, your brain automatically asks:

1. What are the axes?

2. What does the gradient represent?

3. What does the intercept represent?

4. Why am I plotting this graph in the first place?

If you cannot answer question 4, you probably do not yet understand the experiment.

Trend 4: Cambridge Can Repeat Ideas

This was one of the more interesting observations.

The 2024 and 2025 qualitative analysis sections were highly similar in their underlying inorganic QA framework, including the use of familiar reagents and tests.

Why does this matter?

Because students often revise using reasoning like:

That assumption is unsafe.

Cambridge does not need to reproduce the exact same question to revisit the same experimental idea.

A skill can return with:

• different compounds;

• different observations;

• a different calculation;

• a different context.

The practical implication

Do not remove something from your revision simply because it appeared recently.

Last year's question is evidence that the skill is examinable, not evidence that it has been retired.

Trend 5: Planning Has Become Difficult to Predict

If there is one section where I would be very cautious about trend-spotting, it is planning.

The topics changed dramatically:

• 2022: activation energy and kinetics;

• 2023: synthesis and purification of aspirin;

• 2024: distinguishing organic compounds;

• 2025: reaction order using timed sampling, quenching and titration.

There is no convincing four-year cycle here that tells us what the next topic must be.

And that itself is useful information.

Planning is not a memorisation exercise

A strong planning response is not simply a memorised procedure reproduced word-for-word.

You need to adapt what you know to the:

• objective;

• available apparatus;

• variables;

• measurements;

• constraints;

• safety considerations.

The analysis suggests that students are increasingly required to adapt familiar practical knowledge to an unfamiliar objective rather than merely reproduce a standard procedure.

A useful way of thinking about it is:

So What Is My 2026 H2 Chemistry Paper 4 Prediction?

Now for the part everyone actually clicked for.

Again:

This is partly evidence-based analysis and partly my own judgement.

Do not treat it as a guarantee.

Prediction 1: Reaction Kinetics Using Aliquot Sampling + Titration

My boldest prediction is an investigative kinetics experiment where students periodically remove aliquot samples from a reaction mixture and titrate them to determine how the concentration changes with time.

That could then produce a:

• concentration-time graph;

• rate analysis;

• or another kinetics-related graphical treatment.

The reasoning is that kinetics has appeared repeatedly, but the experimental form can continue to evolve.

If this happens, students will need to juggle several skills at once:

timing + sampling + titration + mole calculations + kinetics

Which is exactly why I would consider it a demanding Paper 4 experiment.

Prediction 2: A More Straightforward Quantitative Titration

If the investigative component is already titration-heavy, I would expect the separate quantitative component to be comparatively more direct.

Possibilities include something involving:

• an impurity;

• an excess-reactant method;

• back titration;

• a relatively straightforward stoichiometric calculation.

The prediction is that Cambridge may balance a complicated investigative procedure with a more accessible quantitative calculation rather than loading both sections equally.

Prediction 3: Mixed Inorganic and Organic Qualitative Analysis

For qualitative analysis, my prediction is a mixture of inorganic and organic QA.

That would require students to move comfortably between:

• observations;

• ion identification;

• organic functional-group tests;

• deductions from multiple experiments.

This prediction is less strongly supported by a repeating numerical pattern, so treat it accordingly. It is one of the more judgement-based parts of the forecast.

Prediction 4: Energetics / Calorimetry Planning

Finally, I predict that the planning question could involve energetics, perhaps designing an experiment to determine something such as:

• an enthalpy change of solution;

• or a calorimeter-related thermal quantity.

The logic is partly about balance: if the investigative component is already technically demanding, planning may return to a more familiar experimental framework.

My Full 2026 H2 Chemistry Paper 4 Prediction

If I had to commit to one combination:

Investigative:Reaction kinetics using aliquot sampling and titration

Quantitative:A relatively direct titration involving excess reagent, impurity or back calculation

Qualitative:Mixed inorganic + organic QA

Planning:Energetics / calorimetry

That is my prediction.

And I could be completely wrong.

Which leads to the most important part of this article.

Do NOT Revise Only What I Predicted

If you are taking Paper 4 in two days, please do not react to this article by saying:

That defeats the point of the analysis.

The past four years show almost the opposite lesson:

Cambridge changes the form of experiments.

The safer strategy is to use trends to identify skills that repeatedly matter, not exact questions that must appear.

If I were revising now, I would make sure I could confidently handle:

• reaction kinetics in more than one experimental format;

• titration calculations involving dilution, aliquots and excess;

• graph interpretation;

• inorganic QA;

• organic QA;

• unfamiliar planning questions.

That gives you resilience even if the prediction fails.

What Should You Do in the Final Two Days?

You do not have enough time to relearn the whole H2 Chemistry syllabus.

So prioritise weaknesses that could affect a large number of practical marks.

1. Fix your mole concept and redox calculations

If you can obtain a titre but cannot process it, Paper 4 can still go badly.

2. Review graph skills

Know how to:

• label axes;

• choose scales;

• calculate gradients;

• interpret gradients and intercepts;

• extract the relevant physical or chemical quantity.

  
  

3. Review QA as Chemistry, not as a table

Do not simply memorise colours.

Understand why the tests distinguish different species.

4. Practise planning by adapting

Instead of memorising an entire answer, take an experimental objective and ask:

5. Prepare for unfamiliarity

The actual experiment may not look like your school's standard practical.

That does not mean the underlying Chemistry is unfamiliar.

Final Thought: Don't Try to Predict Cambridge Better Than You Understand Chemistry

Predictions are fun.

They may even help you decide what deserves one final review.

But if there is one conclusion I would take from four years of Paper 4, it is this:

Cambridge can alter the apparatus.

It can alter the substance.

It can change the graph.

It can combine familiar skills in an unfamiliar way.

Your job is not to memorise every experiment that could possibly appear.

Your job is to understand Chemistry well enough that when something unfamiliar appears, you can still work out what to do.

That is a much safer strategy than trying to guess the paper perfectly.

Watch the Full Video

In the full video, I break down all five trends from the 2022–2025 H2 Chemistry Paper 4 papers before revealing my complete 2026 H2 Chemistry Practical prediction.

Watch: https://youtu.be/IvYE0iL76uA

For students using ChemLab, I also identify the stages I think are most useful to practise based on this analysis.

ChemLab: https://docs.google.com/forms/d/e/1FAIpQLSds2HE6VHl0aTwdt2gPJRULgXrV8FOH-dzAIRS5f3Fyb5IgIA/viewform