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A student hypothesises that more salt changes the boiling time of water. What is the independent variable?

Answer and explanation

Correct answer: Amount of salt added

The independent variable is the factor that the experimenter deliberately changes. Here, the student changes the amount of salt to observe its effect, so the amount of salt added is correct. The time taken for water to boil is the dependent variable because it is measured in response to the amount of salt. Exam tip: Identify what is changed first; that is the independent variable, while the measured result is the dependent variable.

Related tags

Independent VariableDependent VariableHypothesisExperimentationBoiling PointSalt WaterHypothesis And ExperimentationExploration: Entering The World Of Secondary Science

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