HOTS Science Primary 4 Cycles

Alexa wants to find out how the surface area of water affects the rate of evaporation. She used two containers, X and Y, with different openings. She put 100 ml of water in X and 200 ml in Y, and placed both in the sun. Why is her experiment NOT a fair test?

A She should have kept the containers in a dark room.
B She should have used different locations.
C She should have used containers with the same surface area.
D She should have used the same volume of water in both containers.
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Worked Solution

Step 1: In a fair test, only one variable (the independent variable) should be changed. Step [2-9]: The variable being tested is surface area. Step [2-9]: The volume of water is a constant variable that she changed (100ml vs 200ml), making the test unfair.

Correct answer: She should have used the same volume of water in both containers.

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