Two hole stopper with inlet and outlet tubes Rubber tubing Procedures: (in lab notebook) Raw data: The copper oxide changed colors during the experimentation. It began as a black powder and and slowly changed to orange as it was heated. It also changed in texture, clumping together into a hard solid rather than a powder. Mass Measurements (in grams) Test tube. 9078 Copper Oxide . 997 Calculated Data: The calculated difference between the test tube containing copper oxide and the test tube after the heating is . 164 grams. Test tube with copper oxide 5. 04 Test tube with copper after burn 45. 740 Analysis/interpreting data/results: The difference between the unknown initial copper oxide and the Cue metal that was produced is . 164 grams. This would indicate that the original copper oxide contained . 164 grams of oxygen and . 833 grams of copper in the original . 997 gram copper oxide.. 164 grams of oxygen is equivalent to about . 010 moles. .833 grams of copper is equivalent to about . 013 moles. Conclusions/comments: The data indicates that the same amount of moles of oxygen and copper were resent in the original copper oxide.
Based on this conclusion, the empirical formula of this copper oxide would be CLIO. This is the formula for Cupric Oxide. The amount of Cupric Oxide used in the experiment was off by a percent error of . 3%, as the theoretical value was 1 gram, and the actual amount used was . 997 grams. Other possible errors could have occurred in the experiment when the tube began to melt during the heating process. The tube was slightly disfigured but it did not seem to affect the final measurements.