Question

more or less water on the penny. paul put equal - sized drops of pure water, one at a time, onto a penny. he recorded the number of drops he could add before the water spilled over the edge of the penny. then, he rinsed and dried the penny, and repeated the test using water mixed with hand soap. paul repeated these trials on seven additional pennies. complete the sentence. in this experiment, the pennies with soapy water were part of ______. a control group an experimental group

Explanation:

In an experiment, the experimental group is exposed to the variable being tested. Here, the variable is the soapy water, so the pennies with soapy water are the experimental group. The pure water pennies serve as the control group for comparison.

Answer:

an experimental group