Question

When a chemical reaction occurs....

1) the substances involved do not mix together and maintain their original properties.
2) the mass of the products are the same as the mass of the reactants.
3) the properties of the products are different from the properties of the reactants.
4) the substances involved mix together but maintain their original properties.

Answer 1

Pretty sure it's number 3.

When you have a chemical reaction, everything changes. Kinda like when you burn something, that's a chemical reaction.