Chemistry/Observing Chemical Changes

Science 8 Laboratory Experiment OBSERVING CHEMICAL CHANGES

PURPOSE:	To observe a chemical reaction and record the evidence for any chemical changes observed.

MATERIAL:
 * 2 - 100 mL beakers
 * distilled water
 * stirring rod
 * small scoopful of copper(II) chloride
 * thermometer
 * paper towel
 * 10 cm x 10 cm square of aluminum foil
 * mortar and pestle

DISCUSSION 1.	What physical change(s) occurred during this experiment?

2.	Make a list of the chemical changes you observed and the evidence you have to support each statement.

3.	Where do you think the aluminum foil went?

4.	When copper is chemically reacted, the solid metal dissolves and forms a blue solution. What evidence do you have that dissolved copper is or is not left in solution at the end of your reaction?

5.	What do you think the red solid was? What evidence do you have to support this conclusion?

6.	Is it possible that the bubbles were caused by boiling and not by a chemical change? Explain.