Physics 5054/41 — October/November 2016
Cambridge O-Level · Alternative to Practical · worked solutions for every part, with the mark scheme
Topics Experimental Contexts · Analysis, Conclusions and Evaluation · Use of Techniques, Apparatus and Materials · Observations and Measurements · Planning Experiments and Investigations
A student investigates how surface area affects the rate of evaporation of water at room temperature.
She places a beaker of water on a top-pan balance, as shown in Fig. 1.1.
Fig. 1.2 shows the beaker on the balance 14 days later.
Some water has been lost due to evaporation.
Calculate the average loss of mass per day by evaporation.
loss of mass per day = ______
A second student carries out the same experiment with a beaker of larger diameter. The students compare their results and conclude that the rate of evaporation increases with surface area.
State two other quantities that must have been the same in the two experiments if they can be sure of their conclusion.
- ______
- ______
The experiment took 14 days to complete.
In order to carry out the experiment in a shorter time, suggest a piece of apparatus that increases the rate of evaporation.
______
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