An experiment contains two groups of individuals that are treated in exactly the same manner except the __ group receives the independent variable, whereas the __ group receives a placebo.

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in a chemical reaction, the atoms and molecules produced by the reaction are called products. no new atoms are created, and no atoms are destroyed. in a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.