What happens during all chemical changes?
select one:
a. matter changes to a different phase.
b. atoms rearrange to form new substances.
c. protons turn into electrons.
d. molecules split apart.

Option (B) is the correct answer.

Explanation:

A change which brings change in composition of atoms of a substance to result in the formation of new substances is known as a chemical change.

Therefore, in a chemical change new substances are formed which have different properties as compared to their reactants.

For example,

Thus, we can conclude that during all chemical changes atoms rearrange to form new substances.

the correct answer is:

a. formation of precipitation