Misconception SCM015:

Substances can change their characteristic properties but maintain their identity (Pfundt, 1982). The products of a chemical reaction are the same substances as the reactants but with different properties (Solomonidou et al., 2000).

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When two white powders react to form a yellow powder, the yellow powder is made up of the same kinds of atoms as the white powders, but the atoms are combined into different molecules.