1 p5 chemical changes 111110 rev

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Matter and Particles: Chemical changes: S1

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1 p5 chemical changes 111110 rev

  1. 1. 1P5: Thursday 11th November, 2010 Matter and Particles: Chemical Changes
  2. 2. Homework • Hand in previous homework today. • New Homework: due in on Tuesday 16th November – write this down in your notebooks!!! – Homework 4. Q1, 2, 3.
  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. 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. 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. 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. 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. 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. 9. What’s next? • Tuesday 17th November – Hand in your homework for me to check! We will be revising Matter and Particles topic for a TEST on THURSDAY 18th November • Using your traffic light colours – please let me know if you have understood chemical reactions today!
  10. 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. 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

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