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Evidence of Chemical Reaction Lab

Evidence of Chemical Reaction Lab. Tuesday, September 25th. Pre-Lab Notes. Chemical change vs. Physical Change Physical change = just changes form Chemical change = something new is made Evidence of chemical change: Gas is produced by itself (not boiling bubbles)

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Evidence of Chemical Reaction Lab

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  1. Evidence of Chemical Reaction Lab Tuesday, September 25th

  2. Pre-Lab Notes • Chemical change vs. Physical Change • Physical change = just changes form • Chemical change = something new is made • Evidence of chemical change: • Gas is produced by itself (not boiling bubbles) • Temperature change by itself • Smell change • Color change

  3. Temperature Change • Increases temperature (gets hotter) • Exothermic • Releases heat • This will feel hot to the touch or you will see the temperature go up • Endothermic • Takes in heat • Feels cold to the touch or you will see the temperature go down

  4. Procedure: • Station One: • Pour 20ml of diluted grape juice into a glass beaker • Add 20ml of ammonia to the grape juice • Put thermometer into solution mixture • Observe and record data & observations • Pour solution down the drain with copious amounts of water • Station Two: • Add 1 scoop of citric acid and 1 scoop of baking soda to the glass beaker • Add 25ml of water • Put thermometer into solution mixture • Observe and record data & observations

  5. Procedure • Station Three: • Put 1 scoop of sodium bicarbonate (baking soda) into glass beaker • Add 20ml of vinegar • Put in thermometer in solution mixture • Observe and record data & observations • Station Four: • Add 1 scoop of calcium chloride to beaker • Add 20ml of water • Put in thermometer into solution mixture • Observe and record data & observations

  6. Data To Record • Start time • Beginning and ending temperatures • Things you see, hear, or smell • Anything else that you even THINK may be important (you never know…)

  7. Lab Cleanliness • Gently rinse out and dry all glassware • Gently rise off and dry thermometers • Make sure counters are kept dry and clean • Clean up any water that spills on the counter or floor Your class WILL NOT be dismissed if any area is dirty. Help others in keeping the room clean!

  8. CER Demo With 5 minutes left of class, I will do a demo for you. You must determine if what I did was a physical or chemical change (claim). Observe and record data that happens (evidence). Use your pre-lab notes to explain why it happened (reasoning)

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