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While testing the effect of temperature on the rate of evaporation, which is a suitable controlled variable?

Answer and explanation

Correct answer: Initial volume of liquid

The direct answer is C, the initial volume of liquid. The experiment tests how temperature affects evaporation rate, so temperature is the independent variable and evaporation rate is the dependent, measured variable. A fair test keeps other important conditions the same. Starting with equal liquid volumes helps ensure that a difference in evaporation is not simply caused by one container having more liquid. Step by step: change temperature; use equal initial volume; keep liquid type, exposed surface area, container, airflow and time comparable; measure evaporation rate; compare results. A is wrong because temperature is the factor deliberately changed. B is wrong because rate is the outcome being measured. C is correct because initial volume can be held constant. D is wrong because amount evaporated is a result or measurement, not a controlled condition in this wording. Other controls may also be needed, but among the given options C is suitable. Memory cue: a controlled variable is kept the same while the tested factor changes.

Related tags

ScienceControlled-VariableEvaporationTemperatureVariables In An ExperimentExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceClass 9 Mcq

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