What can the student predict if she finds the mass of the whole candy bar, including the wrapper?

A student can predict Amount of calories present if she finds the mass of whole candy bar,including the wrapper.

Explanation:

Based on the mass of a whole candy bar a student can predict the calories contained in the candy bar. If the mass of candy bar is more than it means it has more calories and if the candy bar has less mass than it shows the presence of fewer calories.

More calories mean more sugar content in the candy bar. With sugar, the candy bar has carbohydrates also. The sugar present in the bar gives us energy.

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.