Question

Cu+O2+H2O ????
Fe+O2+H2O ????
Cu+Hcl ?????
Zn+H2SO4 ???

Answer 1

1: Cu + o2 + H2O = Cu( OH )2 + 1/2 o2. 2: Fe( OH )2+1/2O2. 3: CuCl2 + H2. 4: ZnSO4 + H2.

Answer 2

1. 2Cu + O2 + 2H2O = 2Cu(OH)2 2. 4Fe + 3O2 + 2H2O = 4FeOOH 3. Cu + HCl = no reaction at room temperature, only above 550 degrees: 2Cu + 2HCl (gaseous) = 2CuCl2 + H2 4. Zn + H2SO4 = ZnSO4 + H2. For more reactions you can use special android app: https://play.google.com/store/apps/details?id=com.chemministry.chemadviser