Using what you have learned about chemical reactions, choose the answer that best explains what happens to the weight of the substances after a chemical reaction occurs.
A. The weight of the substances have changed after a chemical reaction occurs, because they have gone through a physical change, which would change the weight of the substances.
B. The weight of the substances before and after a chemical reaction stay the same, because even though the substances may change form, the weight of each atom does not change.
C. The weight of the substances have changed, because the atoms of the substance have changed. The change in atoms will cause the weight of the substances to change after a chemical reaction.
D. The weight of the substances do not change, because they are still the same substances which went through a chemical reaction.