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Find the reactants, products for the given equations:
  
1 \(+\) \(Zn\)  \(\rightarrow\)  \(+\) \(H_2\)
 
2.  \(+ H_2O \rightleftharpoons\)  \(+\) \(H_3O^+\)
 
Balance the equation:
  
3. \(CuO\) \(+\) \(HCl\) \(\rightarrow\) \(CuCl_2\) \(+\) \(H_2O\)