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1 p5 chemical changes 111110 rev

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Matter and Particles: Chemical changes: S1

Matter and Particles: Chemical changes: S1

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  • 1. 1P5: Thursday 11 th November, 2010 Matter and Particles: Chemical Changes
  • 2. Homework
    • Hand in previous homework today.
    • New Homework : due in on Tuesday 16 th November – write this down in your notebooks!!!
      • Homework 4. Q1, 2, 3.
  • 3. Let’s review our learning: hands up please!
    • What is a chemical reaction?
    • Name some everyday chemical reactions
    • What happened when marble chips were put in the acid?
    • What happened to the temperature?
    • Was a compound or a mixture produced?
    • Can we get the marble chips back out of the solution?
  • 4. Time for some experiments!
    • Aim : Write down the aim of the experiment
    • Apparatus : List all the apparatus you use
    • Diagram : Draw labelled diagrams for both of your experiments – use a ruler!
    • Method : Describe how you performed the experiment
    • Results : Note down all of your observations
  • 5. Lab Safety
    • Ensure all coats are hung up
    • Ensure all bags are on rack
    • Push stools under desks
    • Tie back long hair
    • Tuck ties into shirts
    • Wear your safety goggles at all times
    • Take care when using Bunsen burners
    • Leave Bunsen burners to cool before tidying up
  • 6. Experiment A: Burning Magnesium
    • CAUTION : Do NOT look directly into the white flame!
    • CAUTION : Bunsen burners and tongs will get VERY hot – be careful! Place hot tongs on heat-proof mat.
    • What did the Magnesium look like before burning?
      • Note this down in your notebooks
    • What did Magnesium look like after burning?
      • Note this down in your notebooks
      • Leave a few lines clear in your notebook after your completed write-up
  • 7. Experiment B: Mixing solutions
    • Add 2cm depth of solution A into one test tube
      • What does this solution look like? Note it down
    • Add 2cm depth of solution B into another test tube
      • What does this solution look like? Note it down
    • Pour the contents of one test tube into another
      • What does this mixture look like? Note it down
      • Is there anything else there now that wasn’t before?
  • 8. Let’s review our results: hands up please!
    • What is the chemical symbol for Magnesium?
    • What happened in the experiment?
    • What did Magnesium look like before it was burned?
    • What did it look like after it was burned?
    • What new product was made?
    • Was the new product a compound or a mixture?
    • Can we separate the compound back to the elements?
    • Where did the Oxygen come from to burn with the Magnesium?
    • What is the chemical symbol for Oxygen?
    • What did the solutions look like before they were mixed together?
    • What did the solutions look like after they were mixed?
  • 9. What’s next?
    • Tuesday 17 th November
      • Hand in your homework for me to check!
    • We will be revising Matter and Particles topic for a TEST on THURSDAY 18 th November
    • Using your traffic light colours – please let me know if you have understood chemical reactions today!
  • 10. Word Equations
    • Add this into your notebook after your report on Experiment A:
    • Magnesium + Oxygen  Magnesium Oxide
    • When anything burns it takes in Oxygen from the air.
  • 11. Conclusions
    • Looking back at the three experiments we have done we can say that:
    • Chemical reactions have the following things in common:
      • They produce new substances
      • They involve a change in temperature
      • They involve a change in appearance