A student performs an experiment to determine the density of a sugar solution. She obtains the following results: 1.79 g/mL, 1.81 g/mL, 1.80 g/mL, 1.81 g/mL. If the actual value for the density of the sugar solution is 1.80 g/mL +/- 0.03 g/mL, which statement below best describes her results? A) Her results are precise, but not accurate. B) Her results are both precise and accurate. C) Her results are neither precise nor accurate. D) Her results are accurate, but not precise.

(B) Her results are both precise and accurate.

Explanation:

In Chemistry, Accuracy refers to how close a measurement is to it's standard value or known value. On the other hand, Precision means how close two measurement are to each other regardless whether the results are accurate or not.

In the above question, all the above results are very close to each other. That's why the results are Precise to each other. All the results  are close enough to the actual value of the experiment. That's why the result are also accurate.

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