Question

Which statement describes a chemical reaction?

A) Atoms in the products are rearranged to form new substances.
B) Atoms in the reactants are rearranged to form new substances.
C) Atoms in the products change into new atoms to form new substances.
D) Atoms in the reactants change into new atoms to form new substances.

Answer 1

Which do you think it is?

Answer 2

I don't really like the wording of the statements at all. (technically it should say electrons rearrange themselves).

In a chemical reaction you form new substances but the constituents are all from the reactants so atoms don't 'change' into products, they are just 'rearranged', or just put into different configurations. Atoms only change in a nuclear reaction when atoms gain or lose protons and therefore becomes different atoms.