Mass

• Law of conservation of mass

  No atoms are lost or made during a chemical reaction, so the mass of the products equals the mass of the reactants
• Chemical reaction


  1. Reactants

  2. Products
• Reactants


  Starting materials in a chemical reaction
• Products


  Chemicals that are formed in a chemical reaction
• 24 grams of magnesium reacted with 71 grams of chlorine
• Mass of reactants


  Mass of products
• 92 grams of sodium reacts with 32 grams of oxygen to produce sodium oxide
• A mass of calcium carbonate reacted to produce 112 grams of calcium oxide and 88 grams of carbon dioxide
• A mass of magnesium oxide reacts with 73 grams of hydrogen chloride to produce 95 grams of magnesium chloride and 18 grams of water