During a chemical reaction, substances (called reactants) are combined to form new substances (called products). Which of the following accurately describes the reactants and the products of a chemical reaction? A. The products contain a different number of atoms than the reactants but have the same properties. B. The number of atoms and the properties are the same in the reactants and the products. C. The products contain the same number of atoms as the reactants but have different properties. D. The number of atoms and the properties are different in the reactants and the products.