Experimental Techniques
16 past-paper questions on Experimental Techniques · examined 2021–2025.
20253 questions
Suggest why the mixture is stirred in step 6.
Suggest why Y is added to X using a burette and not a measuring cylinder.
Suggest why the temperatures are recorded after 30 seconds and not immediately after mixing.
20244 questions
The diagram shows four pieces of apparatus that are used to measure the volume of liquid. Which piece of apparatus is always filled to the same level?
The chromatogram shown is produced using a spot of black ink placed at point X. Spot M is produced by a blue dye in the ink. What is the Rf value of this blue dye?
A student measures the rate at which a fixed mass of magnesium reacts with a fixed volume of dilute hydrochloric acid. Which additional pieces of apparatus are required for this experiment?
The temperature increases calculated are less than the true values for these experiments. Suggest a reason for this. Describe an improvement to the method which makes the results closer to the true values.
20221 question
Name a piece of apparatus that can improve the accuracy of the volume of NaOH(aq) added to the beaker.
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