Title: Experiment Involving the Heating of Copper

 

Objective: To using measurements to show a chemical change occurred.

 

Materials: Balance     Ring Stand

              Crucible     Pipe Stem Triangle

              Copper       Burner

 

Procedure:

            Mass the copper and crucible

            Heat the copper for 10 minutes in the ring stand and pipe stem

            Mass them again and record the change (if any).

 

Calculations:

 

Mass of Copper and Crucible	29.45
Mass of Copper after heating	29.55
Change in Mass	.10

 

Conclusions:

           

1)      I think there will be a change in mass after heating.

2)      The mass will increase because oxygen will bond with the copper when heated.

3)      There was a change in mass, the mass increased.  My hypothesis was correct.

4)      The mass increased because the heating of copper caused oxygen to bond with the copper.  Forming Copper(II) oxide or cupric oxide.  Copper would logically bond with O2 and not just a single O, because it would take more energy to split the O2 in to O.  This makes it Cu2O2, Copper having oxidation numbers of 1 and 2, would use the second oxidation state.