In this chemical reaction a very reactive metal, sodium, combines with a poisonous gas and results in the formation of ordinary table salt. In the chemical reaction ______________ is the product.A)NaB)NaClC)Cl2EliminateD)a reactive metalDescribe the mass of the reactants and products given the balanced chemical reaction. A) The mass of the products is 2 3 that of the reactants. B) The mass of the reactants equals the mass of the products. C) The mass of the reactants is less than the mass of the products. Eliminate D) The mass of the reactants is greater than the mass of the products.

Antoine Lavoisier found that mass was conserved in chemical reactions when he saw thatA)heat was released in chemical reactions.B)the products differed greatly from the reactants.C)the mass of the products was the same as that of the reactants.EliminateD)the mass of the products were heavier than the mass of the reactants.
 A copper sheet is heated in a furnace until it melts. The hot liquid copper is then cooled until it becomes solid again. Compare the mass of the copper before and after melting.A)The new solid copper is lighter than the original sheet.B)The new solid copper is heavier than the original sheet.C)The new solid copper is the same weight as the original sheet.EliminateD)The molten copper was lighter than the sheet or the new solid.