Chemistry January 12

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  • 1. CHEMISTRY
  • 2. COPY DOWN THE FOLLOWING DEFINITIONS INTO YOUR NOTES• Chemical Change: A change in substances the have reacted chemically. The original substance is changed to a new substance and cannot be easily undone• Physical Change: A change in substance where no new substance are formed, but it does take on different characteristics (example: solid becoming a liquid). Physical changes are reversible, which means they can be returned to their original state)
  • 3. • Chemical vs Physical Change• Here is a quick video to go over this concept. You will have to turn the volume up a bit to hear the narrator• http://www.youtube.com/watch?v=hcunQqbNEM Q&feature=related
  • 4. • Take a look at the first page of your booklet to get an idea of how to identify Chemical Changes
  • 5. • Here are some cool reactions. Check them out. Do you think these are chemical or physical changes?Lead Nitrate and Potassium Iodide• http://www.youtube.com/watch?v=RE- dFN7U91M&feature=relatedElephant Toothpaste• http://www.youtube.com/watch?v=ezsur0L0L1c&fe ature=related
  • 6. • Now please complete the second page of your booklet. You may do this on your own or with a partner.
  • 7. • Now think about the Salt Crystals we made. Did you figure out if this was a chemical change or a physical change?• Now look at the third page of your booklet. You need to come up with a way you would make a bigger and better crystal.• Remember to include all of the variables (manipulated and constant) as well as a testing question)
  • 8. ADD THOSE NOTES ON CARBON DIOXIDE TO YOUR BINDER Carbon DioxideCarbon Dioxide is odourless, tasteless, colourless, andheavier than air and does not burn. It is used to putout certain types of fires and also used in carbonateddrinks.Way to make CO2:• 10 ml of yeast + 10ml sugar + 60ml of water• Baking soda + vinegar (often seen in homemade volcanoes)
  • 9. DEMONSTRATION• We will be doing a class demonstration when we get a free moment in class.