In an experiment to test how temperature affects dissolving, a student uses different amounts of sugar in hot and cold water. Why would this experimental design be considered unfair?
Using different amounts of sugar introduces an additional variable that could affect the results
2 )
Sugar dissolves differently in hot water than in cold water regardless of amount
3 )
The temperature of water changes when different amounts of sugar are added
4 )
The experiment should test only one type of sugar at a time
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