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A student adds different amounts of salt and measures the boiling time of water. What type of variable is the amount of salt?

Answer and explanation

Correct answer: Independent variable

The amount of salt is the factor that the student deliberately changes, so it is the independent variable. The boiling time is measured and may change with the amount of salt, so it is the dependent variable. Controlled variables are conditions kept the same, such as the initial quantity of water. Exam tip: identify the variable deliberately changed in an experiment as the independent variable.

Related tags

Independent VariableDependent VariableControlled VariablesExperimental VariablesBoiling PointSalt WaterVariables In An ExperimentExploration: Entering The World Of Secondary Science

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