Changing substances

    Cards (9)

    • Chemical change
      Produces a new substance, irreversible
    • Physical change

      No new substance produced, reversible
    • Physical changes
      • Melting
      • Evaporating
      • Condensing
      • Freezing
      • Sublimation
    • Physical changes only change the energy that each particle has (how much it moves) and not its arrangement or properties (e.g. its boiling or melting point)
    • Chemical change

      • Change in colour or temperature, or if the reaction produces light
    • In a chemical change, a new substance (or product) is always made
    • Chemical change
      Also called a chemical reaction
    • The number and type of atoms do not change in a chemical change and are only rearranged
    • The total overall mass is conserved in a chemical change (the mass of the reactant is equal to the mass of the products)