Chemical change

• Chemical Change


  Occurs when the chemical composition of a substance changes
• Chemical Change


  • Firework
  • Breaking ring
  • Frying
• Physical Change


  The material or substance changes but its chemical composition remains the same
• Physical Change


  • Melting
  • Boiling
  • Chopping wood
• Preparation of Hydrogen


  1. Diagram

  2. Reactivity of metals

  3. Specific word equation

  4. Observation notes
• Preparation of Carbon Dioxide

  1. Diagram

  2. Specific word equation
• Preparation of Oxygen


  1. Diagram

  2. Delivery tube
• How can you tell a chemical reaction is happening?
• Which metal reacted fastest?
• What gas was made?
• How could you make this a fair test?
• Candle Practical


  1. Observation notes

  2. General word equation
• Why is hydrogen collected using water displacement?
• When acid reacts with an alkali, a metal or a carbonate a chemical reaction takes place.
• Test for Hydrogen


  Word equation
• Why was Manganese (IV) oxide added?
• What colour is Manganese oxide?
• Why did the candles not burn for the same length of time?
• How could Manganese be removed?
• Test for Carbon Dioxide

  Bubble through limewater
• Test for Oxygen


  Place glowing splint into test tube
• Iron wool Balance


  1. Diagram

  2. Explanation
• Fire triangle


  • Oxygen
  • Fuel
  • Heat
• Thermal decomposition (endothermic reaction)


  Copper carbonate -> Copper + Carbon
• What gas in air is used in burning fuels?
• Fossil fuels are a substance that was made a very long time ago from plants
• Equation


  Oxygen + Fuel -> Carbon dioxide + Water
• During a chemical reaction what must happen to the bonds in molecules?
• Electrolysis


  Breaking down compounds using electric current
• Why is electrolysis carried out in a fume cupboard?
• Burning


  Thermal decomposition