Physical and chemical changes

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Physical Chemical Changes

Physical Chemical Changes

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  • 1. PHYSICAL and CHEMICAL CHANGES
  • 2. Physical Changes
    • A physical change occurs when a substance changes, but no
    • new substance is formed.
    • Physical changes occur when the state of a substance
    • changes (eg melting, evaporation, freezing, condensing) or a
    • substance is crushed, ground or cut into smaller pieces.
    • Physical changes are often easy to reverse.
  • 3. Change of State Remember The particles in a solid are close together and vibrate. The particles in a liquid are further apart and slide over each other. The particles in a gas are far apart and bump into each other as they move quickly.
  • 4.
    • The following are examples of physical change.
    • • A plate is dropped and shatters.
    • • Ice melts.
    • • Water boils.
    • • Wax melts.
    • • Iodine sublimes.
  • 5. Chemical Changes
    • A chemical change or chemical reaction occurs
    • whenever a new substance forms.
    • Evidence that a new substance is formed are –
    • a change in colour.
    • a gas given off.
    • a new solid forms.
    • a change in temperature.
  • 6.
    • The following are examples of chemical change.
    • • Wood burns
    • • An egg is cooked to become a white and yellow solid.
    • • A metal panel on a car rusts.
    • • Fireworks explode.
    • • Concrete hardens.
    • • An egg cooks.
    • • Paper burns.
  • 7. Questions
    • 1. Label the following diagram replacing each letter A – G with a word
    A = solid B = liquid C = gas D = melting E = evaporation F = condensing G = freezing
  • 8. Questions
    • Classify the following examples as physical or chemical changes.
    • a) Water freezes to make snow.
    • b) A cake cooking.
    • c) Food is digested.
    • d) A puddle of water evaporates.
    • e) Lighting the gas in a bunsen burner.
    • f) Lighting a match.
    • g) Steam condensing on a mirror.
    • h) Melting a gold nugget to make a gold bar.
    • i) Dynamite exploding.
    • j) Burning your toast.
    • k) Water freezes to make ice cubes.
    • l) Ice cream melting.
    • m) Iron rusting
    a) Physical b) Chemical c) Chemical d) Physical e) Chemical f) Chemical g) Physical h) Physical j) Chemical i) Chemical k) Physical l) Physical m) Chemical
  • 9.