Endothermic vs. Exothermic (part 2)
Challenge: How many signs of a chemical reaction can you observe?
Materials:
Beaker
15 mL graduated vial
Aluminum Foil (Al)
Plastic Spoon
30 mL graduated measuring cup
Copper Chloride solution (CuCl2)
Dropper
Goggles
Procedure:
1.Create data table.
2.Observe chemicals and record properties in data table.
3.Measure 25 mL copper chloride (CuCl2) add to beaker
4.Carefully fold the aluminum foil in half and then in half again.
5.Place the foil in the beaker with the copper chloride (CuCl2).
6.Use the spoon to push the aluminum foil down so that it is completely submersed in the solution.
7.Observe reaction.
8.Record observations in data table.
9.When the reaction is complete, use the dropper to carefully remove the remaining liquid from the beaker and
place it in the measuring cup. Record observations.
10.Scoop out the remaining solid with the spoon and put on a paper towel. Record observations.
11.Clean up by rinsing out the dropper, vial, measuring cup and beaker.
12.Answer the analysis questions.
Data Table:
Chemicals
Observations
Copper Chloride solution (CuCl2)
Aluminum Foil (Al)
Copper Chloride solution (CuCl2)
and
Aluminum Foil (Al)
Remaining liquid
Remaining solid
Analysis:
1.Did a chemical reaction take place? What is your evidence? (give at least 3 examples)
2.Was there a temperature change? If so, was it exothermic or endothermic?
3.Describe the remaining solid material. What do you think it is? Why? What is your evidence?
Conclusion: (answer the Challenge question and provide evidence from your experiment.)