Question

the passage below describes an experiment. after a severe winter storm, alvins 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. alvin weighed twenty ice cubes. he sprinkled salt on half of the ice cubes and left the other half unsalted. he placed all the ice cubes outside. one hour later, alvin quickly dried each ice cube and reweighed it to see how much it had melted. in this experiment, which were part of an experimental group? the unsalted ice cubes the salted ice cubes

Explanation:

In an experiment, the experimental group is the one that receives the treatment being tested. Here, the treatment is adding salt to ice - cubes. The unsalted ice - cubes are the control group for comparison.

Answer:

the salted ice cubes