Question

the passage below describes an experiment. after a severe winter storm, rons driveway was covered with ice. he read that salt makes ice melt at a lower temperature. before covering his entire driveway with salt, he wanted to know if adding salt could actually help melt ice in the freezing outdoor temperatures. ron weighed twelve ice cubes. he sprinkled one teaspoon of salt on four of the ice cubes and two teaspoons of salt on four others. he left the remaining four unsalted. he placed all the ice cubes outside. one hour later, ron quickly dried each ice cube and reweighed it to see how much it had melted. in this experiment, the unsalted ice cubes were part of _______. a control group an experimental group

Explanation:

In an experiment, a control group is used as a baseline to compare with experimental groups (which have the variable, here salt, applied). The unsalted ice cubes aren't given the salt (the independent variable), so they act as the control group to see the effect of salt by comparison.

Answer:

a control group