18.State a control variable if you're investigating the effect of temperature on the time taken for iodine to remain yellow.
Question
18.State a control variable if you're investigating the effect of temperature on the time taken for iodine to remain yellow.
Solution
A control variable in this experiment could be the concentration of iodine used in each trial. By keeping the concentration of iodine constant, you can ensure that any changes observed in the time taken for iodine to remain yellow are due to changes in temperature, not differences in the amount of iodine.
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