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A student investigates how the amount of salt affects the boiling point of water. Which is the dependent variable?

Answer and explanation

Correct answer: Boiling point of water

The direct answer is C: boiling point of water. The independent variable is the amount of salt, because that is what the student deliberately changes. The dependent variable is the result that responds and is measured. Here, the student observes the temperature at which the water boils, so the boiling point is dependent on the salt amount. Option A, amount of salt, is independent, not dependent. Option B, initial amount of water, should be kept constant for a fair comparison and is a control condition. Option C is correct because it is the measured outcome. Option D, container size, should also be controlled unless it is being studied; it is not the stated result. A clear method is to label the experiment as “effect of salt amount on boiling point”: the first part is independent and the second part is dependent.

Related tags

Dependent-VariableBoiling-PointSaltVariables In An ExperimentExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScienceClass 9 Mcq

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