Homework Answers
Balanced Chemical Equation:
a. 2Cu (s) + O2 (g) ---------> 2CuO (s)
b. Cu : Element
O2 : covalent compound
CuO : Ionic compound
Yes, the color of the metal piece changed.
The reddish-brown color of the copper metal changes to black.
Charges on the reactants:
Cu : 0
O2: 0
Charge on each ion in the product:
CuO : Cu has a charge of (+2) and oxygen has a charge of (-2).
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