1) It's just a theory. That statement often gives the impression of uncertainty. But a scientific theory does not represent uncertainty. Cite evidence that supports the fact that a scientific theory does not represent uncertainty.

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.