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📈 H2 Physics: Should your graph be straight?A curved graph does not automatically mean your measurements are wrong.For a...
07/09/2026

📈 H2 Physics: Should your graph be straight?

A curved graph does not automatically mean your measurements are wrong.

For a simple pendulum at small angles, the period T is proportional to the square root of its length L.

Plotting T² against L gives a straight-line relationship in the ideal model, using the same measurements.

If the question specifies the axes, use them; if it asks you to linearise, rearrange the equation to choose what to plot.

These graphs illustrate the relationship rather than actual experimental data.

Lean in.Squint.A little lower.Is that the line?Look again.Yes.Pencil to paper.
07/09/2026

Lean in.
Squint.
A little lower.
Is that the line?
Look again.
Yes.
Pencil to paper.

H2 Chemistry organic synthesis involves choosing reagents and conditions, then working out how to obtain the required pr...
06/09/2026

H2 Chemistry organic synthesis involves choosing reagents and conditions, then working out how to obtain the required product.

Use the product's properties and the information in the question to choose suitable separation and purification steps.

These slides are a decision guide, not a fixed procedure for every reaction.

The 9476 syllabus includes reflux and distillation, but does not expect a large-scale synthesis involving reflux, distillation and purification during the practical exam.

H2 Chemistry: The Last Drop 💧A drop.Swirl the flask.Another.Fingers on the tap.Not yet.
05/09/2026

H2 Chemistry: The Last Drop 💧

A drop.
Swirl the flask.
Another.
Fingers on the tap.
Not yet.

H2 Biology Microscopy 🔬🧫An entire room narrows to a circle of light.Focus. Adjust. Look again.In practical Biology, the ...
04/09/2026

H2 Biology Microscopy 🔬🧫

An entire room narrows to a circle of light.

Focus. Adjust. Look again.

In practical Biology, the smallest detail asks for your full attention.

ΔHsol means the enthalpy change of solution.Twice the water gives a smaller temperature drop, but does it change the cal...
03/09/2026

ΔHsol means the enthalpy change of solution.

Twice the water gives a smaller temperature drop, but does it change the calculated ΔHsol?

Follow the mass and temperature terms through |q| = mc|ΔT| before choosing your answer.

In the ideal calculation, the larger mass and smaller |ΔT| offset, so ΔHsol stays the same.

H2 Chem: Why a Hot Crucible Gives Unstable Readings 🔥A hot crucible can make the balance reading drift even when its mas...
02/09/2026

H2 Chem: Why a Hot Crucible Gives Unstable Readings 🔥

A hot crucible can make the balance reading drift even when its mass has not changed.

See how warm air affects the displayed value and why you should cool the crucible before weighing.

H2 Chemistry: Stop or Heat Again? 🔥A change in mass does not mean constant mass has been reached.Follow the full heat, c...
01/09/2026

H2 Chemistry: Stop or Heat Again? 🔥

A change in mass does not mean constant mass has been reached.

Follow the full heat, cool, weigh and repeat cycle.

Stop when consecutive recorded masses no longer change at the displayed precision, unless the question gives a different rule.

Can You Read This Burette? 🧪Choose the correct eye position and record the burette reading.Then check why eye level matt...
31/08/2026

Can You Read This Burette? 🧪

Choose the correct eye position and record the burette reading.

Then check why eye level matters, how the scale runs, and when to record to the nearest 0.05 cm³.

Try the final reading and explain which part of the meniscus you used.

30/08/2026

A mystery salt releases a gas that turns limewater milky.

Aqueous ammonia then produces a light-blue precipitate that dissolves in excess to form a dark-blue solution.

Follow the observations, infer the ions and identify compound X.

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