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A student measures the mass change of potato pieces in salt solutions of different concentrations. What is the dependent variable?

Answer and explanation

Correct answer: Change in potato mass

The direct answer is C, change in potato mass. The experiment changes salt concentration and measures how potato mass changes. Thus salt concentration is the independent variable, while mass change is the dependent variable because it responds to concentration. Step by step: prepare solutions with different concentrations; use potato pieces that are comparable in size and starting mass; keep solution volume, time and temperature similar; measure final mass; calculate change as final mass minus initial mass, or compare the loss or gain; the calculated mass change is the measured outcome. A is wrong because concentration is deliberately changed, so it is independent. B is wrong because initial size should normally be controlled, not the result. C is correct because mass change is what is measured. D is wrong because solution volume should usually be kept constant as a control. The terms “dependent variable” and “outcome variable” are closely related, but only C is offered as the measured change. Memory cue: the variable that answers “what happened to the potato?” is dependent.

Related tags

Dependent-VariablePotatoMass-ChangeVariables In An ExperimentExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScienceClass 9 Mcq

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