kenzymarie34 kenzymarie34 30-09-2021 Physics contestada Based on law conservation of mass , which of the following is a true statement A) The mass of the products is always greater than the mass of the materials which react in a chemical change B) The mass of a product is always less than the mass of materials which react in a chemical change C) Matter is neither lost nor gained during a chemical change D) A certain mass is a material must be present for a reaction to occur