Chapter summary
Data and Experimental Skills, at a glance
Read unfamiliar evidence, make useful measurements and explain what a result can support.
A-Level 9476 (2026-2027)
Quick revision
Revisit the essentials, then return to an explanation when you need it.
Read the requested quantity or claim first. Select the relevant evidence, state the chemical connection and give a result with its unit or a justified conclusion.
| Question | Check |
|---|---|
| What do the axes mean? | Distinguish accumulated amount from its rate of change |
| Is the comparison fair? | Check temperature, amounts and other potentially changing variables |
| What does the uncertainty affect? | Trace its effect through the calculation; do not assume every error raises the answer |
| How far can I conclude? | Distinguish interpolation from extrapolation and evidence from an untested explanation |
For a practical result, preserve raw readings, use a justified mean and the balanced mole ratio, and distinguish observation from inference. A useful evaluation names the limitation, its effect and a targeted improvement.
Check your understandingA catalyst reaches the same plateau sooner. What two conclusions should you keep separate?Think it through, then reveal the answer
The reaction proceeds faster under the compared conditions. The final measured amount is unchanged; reaching the plateau sooner does not by itself mean a larger yield.