What is that... Ya THAT!!!!

Introduction:  What are the signs of a chemical change?  There are four different signs such as a change in color, bubbles without heat, form of a precipitate, and production of heat or light.  How can we witness all four of these evidences of a chemical change all in one lab?  If you follow these steps and do this aweesome lab you will witness all four of these changes!!!  Hope you enjoy :)

Hypothesis:  During this lab we will see a color change, bubbles, formation of a precipitate, and production of heat. 

Materials:

• One beaker- 150 or 250 ml
• Copper(II) sulfate pentahydrate- caution, toxic substance!!!!!!
• Scoopula
• 100 ml graduated cylinder
• Stirring rod
• Thermometer
• Small square of aluminum foil

Procedure: This lab is unique in that it serves both as an introduction to both the laboratory environment and as a review and demonstration of terms and concepts we have recently learned in lecture.  Thus, as you read and follow the procedure, be sure to answer all questions that are posed to you in the space provided.  

Data: During this lab the beginning temperature was around 21.  After we added the salt the temperature ended at just above 25. 

Discussion: During this lab we saw copper forming after we added the salt and foil.  This is a formation of a precipitate, one of our clues of a chemical change.  We also saw some bubbles forming without adding heat, the temperature rose, and the color of the foil changed. 

Conclusion:  We accept our hypthesis, during this lab we saw all the clues to a chemical change.