Why does luis place 3 cups of water without any solute in the freezer?
a. if some water spills, he will have extra
b. the plain water is the control group
c. he wants to know how long water takes to freeze
d. the 3 cups of water are unnecessary to the experiment
(b)
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How are we supposed to know what expriment you are doing? I have no idea why Luis placed three cups in the freezer, much less why they were empty. Perhaps he was having a bad day.
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