Question

soda with carbon dioxide bubbles raymond wanted to freeze soda to make popsicles. he knew that soda contains carbon dioxide gas, which forms bubbles as it escapes from the liquid. he wondered if the popsicles would freeze more quickly if he removed the carbon dioxide. raymond took the lids off three small bottles of soda. he left the lids off overnight so that carbon dioxide could escape from the bottles. he kept the lids on three other bottles to keep the carbon dioxide in. the next morning, raymond placed all six bottles in the freezer. after two hours, he checked whether soda in any of the bottles had frozen. in this experiment, which were part of an experimental group? the bottles with lids kept on the bottles with lids taken off

Explanation:

The experimental group in an experiment is the group that receives the treatment being tested. Here, the treatment is removing carbon - dioxide. The bottles with lids taken off allow carbon - dioxide to escape, so they are the experimental group.

Answer:

the bottles with lids taken off