Conservation of Mass

• What is the law of conservation of mass?

  No atoms are lost or made during a chemical reaction.
• How does the law of conservation of mass apply to chemical reactions?

  The mass of the products equals the mass of the reactants.
• If 24 grams of magnesium reacts with 71 grams of chlorine, what is the mass of magnesium chloride produced?

  95 grams
• What are the starting materials in a chemical reaction called?

  Reactants
• What is the product formed when magnesium reacts with chlorine?

  Magnesium chloride
• In the example given, what is the total mass of the reactants when 24 grams of magnesium reacts with 71 grams of chlorine?

  95 grams
• If 92 grams of sodium reacts with 32 grams of oxygen, what is the mass of sodium oxide produced?

  124 grams
• How do you calculate the mass of calcium carbonate that reacted if it produced 112 grams of calcium oxide and 88 grams of carbon dioxide?

  The mass of calcium carbonate is 200 grams.
• What is the total mass of products when calcium carbonate produces 112 grams of calcium oxide and 88 grams of carbon dioxide?

  200 grams
• If magnesium oxide reacts with 73 grams of hydrogen chloride to produce 95 grams of magnesium chloride and 18 grams of water, what is the mass of magnesium oxide?

  40 grams
• How do you find the mass of magnesium oxide in the reaction with hydrogen chloride?

  Subtract the mass of hydrogen chloride from the total mass of products.
• What is the total mass of products when magnesium chloride and water are produced in the reaction?

  113 grams
• What should you remember about calculating masses in chemical reactions?

  Masses must be conserved; the total mass of reactants equals the total mass of products.
• What are the steps to calculate the mass of products in a chemical reaction?

  • Identify the reactants and their masses.
  • Add the masses of the reactants to find the total mass.
  • Use the law of conservation of mass to determine the mass of products.
• What is the significance of the law of conservation of mass in chemistry?

  • It ensures that mass is conserved in chemical reactions.
  • It allows for accurate calculations of reactants and products.
  • It helps predict the outcomes of chemical reactions.