Question

the passage below describes an experiment. jonah noticed that he could make a dome of water on a penny if he added drops of water slowly enough. he wondered if adding soap to the water would allow him to fit more or less water on the penny. jonah 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. jonah 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 control group is unchanged, while the experimental group has the variable being tested. Here, soapy - water is the variable being tested on the pennies.

Answer:

an experimental group