BATON ROUGE COMMUNITY COLLEGE
PHYSICAL SCIENCE 102
SPECIAL PROJECT
#1
In this project you will examine physical and chemical changes. Your
project is to proceed as follows...........
Three reactions are performed in a sealed Ziploc™ bag so that they can be
easily observed. Materials per lab group Substitutions per lab group
4 ziptop bags
1 Tbsp. calcium chloride(moisture test kits are a good source
..........also, "De-Ice" for sidewalks--Grocery Store!)
2 Tbsp. sodium hydrogencarbonate 2 Tbsp. baking soda
30 mL water
35 mm film canister (top optional) 1 small paper cup of water
30 mL indicator solution (phenol red) 30 mL red cabbage juice
Procedure
1. Add 2 Tbsp. sodium hydrogen carbonate to a Ziploc™ bag. Gently
place a film canister (approximately1/3 full of water) inside
the bag in the upright position. Squeeze out any excess air and
seal the bag. Spill the water into the bag by shaking. Look,
listen, and feel. Record your observations.
2. Add 1 Tbsp. of calcium chloride to a second Ziploc™ bag. Repeat
the remaining steps in procedure 1 for the calcium chloride, and
record your observations for this material.
3. Mix 2 Tbsp. of sodium bicarbonate and 1 Tbsp. of calcium
chloride in a third Ziploc™ bag and mix thoroughly.
4. Repeat the remaining steps. Repeat procedure 3, replacing the
water in the film canister with 30mL of indicator solution.
Data and Observations
1. sodium hydrogencarbonate in water________________________________
________________________________________________________
2. calcium chloride in water____________________________________
________________________________________________________
3. NaHCO3 + CaCl2 in water__________________________________
________________________________________________________
4. NaHCO3 + CaCl2 with indicator
solution________________________________
________________________________________________________
Questions
1. Classify each of these changes as chemical or physical. Use
your observations to help you make your decisions.
2. In the fourth bag, what did the indicator tell you about the
observed reaction?
3. What gas is being produced? How could you test this?
4. Write an equation for any chemical changes that have taken
place.
5. Define heat of solution. Is it a physical change or a chemical
change?
.............. in your report!!
•You are to "write-up"(typed) and submit your results in the
proper report format.
Your completed report is due [click here!].!!!
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•You are to "write-up"(typed) and submit your results in the
proper report format.
Your completed report is due [click here!].!!!
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