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rate of reaction lesson for year 9 class

Discussion in 'Science' started by poorsoul, Jun 8, 2011.

  1. poorsoul

    poorsoul New commenter

    I have been asked to deliver a demo lesson for an interview ( rate of reaction for a year 9 higher ability class). I am bit confused because I think rate of reaction is year 10/11 stuff. will be grateful for any advice on the matter.
     
  2. Roboteer

    Roboteer New commenter

    At this time of year many schools have started the GCSE syllabus with their year 9s, particularly top sets who may be taking the triple award.
    Ideas for rates of reaction demos are disappearing cross (if you can get a visualiser or projector it is easier for class to see what happens), combustion of magnesium ribbon vs magnesium filings, potassium permanganate crystals with glycerol (grind up to powder - it catches fire immediately, as crystals you have to heat a glass rod and stick it in the middle to start it).
    Nice topic to have for your lesson as plenty of ways you can approach it. Good luck!
     
  3. Another good demo would look at the reaction of limestone chips with acid which you can do on top of a balance. The chemistry should then be familiar to them and you could look at the size of the chips, the effect of mixing and maybe get the technicians to warm some of the acid up for you in a water bath to look at the effect of temperature.
     
  4. skeptucator

    skeptucator Occasional commenter

    Elephant toothpaste is by far the most visually impressive. Perhaps you won't have time to do a class prac or don't want the risks involved. My students love this demo, you can show them the Dr. Bunhead example at the end of the lesson where he does it as a practical joke in a toilet. Can talk about why does it not catalyse until toilet flushes etc.
    http://www.youtube.com/watch?v=ezsur0L0L1c

    http://www.youtube.com/watch?v=FcbB0p_iPXA
     
  5. poorsoul

    poorsoul New commenter

    Thanks for great ideas. Will let you know how it went.
     
  6. blazer

    blazer Star commenter

    This is how I stat rates with my yr 11s

    They get 3 marble chips of approx the same size, 3 boiling tubes and a rack.

    they put 10ml of 1M HCl in each tube.
    They keep 1 chip intact. They break the 2nd chip into small pieces using a pestle and mortar. They grind the third chip into powder. using scrap paper they tip the three 'chips' into the three tubes at the same time and observe. Which one fizzes fastest?
    The you can work with the chemical equation and talk about production of the products. Then I use wooden 1cm blocks and build cubes. 64 cubes make s a 4x4x4 big cube or 8 smaller 2x2x2 cubes or 64 1x1x1 cubes. calculate surface area and volume for each set of cubes.
     

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