Are atoms created or destroyed in a chemical reaction? How do you know?

No atoms are created or destroyed in chemical reactions.

Explanation:

Matter cannot be created or destroyed. When two reactants contact each other, a chemical reaction occurs which breaks the bonds between atoms and rearranges them, forming new bonds which transform them into the product. The same amount of atoms exists before and after the reaction.

your answer is rna to the question.

i'd say that the moon rock is about 2.2 billion years old.