Physics 5054/41 — May/June 2020
Cambridge O-Level · Alternative to Practical · worked solutions for every part, with the mark scheme
Topics Experimental Contexts · Analysis, Conclusions and Evaluation · Observations and Measurements · Use of Techniques, Apparatus and Materials · Planning Experiments and Investigations
A student has two measuring cylinders. One cylinder contains water and the other cylinder contains ethanol, as shown in Fig. 1.1.
Write down the volumes of water and ethanol in the measuring cylinders shown in Fig. 1.1.
volume of water = ______
volume of ethanol = ______
The student then pours the ethanol into the water and allows the liquids to mix. There is no chemical reaction.
Fig. 1.2 shows the volume of the mixture.
Use your answers to (a) to calculate the total volume of water and ethanol before they are mixed.
total volume before mixing = ______
Write down the combined volume of the mixture, as shown in Fig. 1.2.
combined volume = ______
Suggest one possible reason for the difference between the two answers in (b)(i).
A second student says that the result after mixing must be incorrect.
State what the first student does to check the data.
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