Question 1 of 9701 Paper 5 walks through one practical from start to finish: the plan, the apparatus, the readings, a graph or table, the calculation and the evaluation. Each question below is rephrased from a real past paper: answer it part by part, then compare with a worked full-mark answer and the examiner's comments.
Name the apparatus with its capacity and precision (a 50.00 cm3 burette, a 250.0 cm3 volumetric flask), give quantities you can actually measure, and put the steps in an order someone else could follow.
Show the working, carry the full value through, and give the answer to the number of significant figures or decimal places the data support, with units and the sign of an enthalpy change.
Headings with units, consistent decimal places, crosses plotted to within half a square, and a line of best fit drawn the way the question asks: straight, curved or extrapolated.
Pick the weakness that matters most for this method (heat loss, gas escaping, an end point hard to see), explain its effect on the result, and give an improvement that fixes that weakness.
The question on this page is rephrased from a Cambridge International past paper for teaching. The figures, wording of the workout and the worked example are our own; the marking follows the published mark scheme. The original question paper is available from Cambridge.