Dylan wanted to find out whether water with dissolved salt evaporated faster than water with dissolved sugar. Here is the plan he wrote for his investigation:
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Mix 3 teaspoons of salt in half a cup of warm water.
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When the salt is dissolved, pour the solution into a saucer and put it on the window sill.
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Mix 2 teaspoons of sugar in half a cup of warm water.
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When the sugar is dissolved put the cup on the window sill.
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Check the solutions at 2 p.m. every day. When all the water has evaporated from the containers the answer will be known!
a) There are some problems with Dylan's plan which means that it is not a "fair test".
Write down two of the problems.
