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Types of chemical reactions (Double displacement (The anions are exchanged…

- - - - In this reaction, hydrogen and Oxygen combine to form water. So, since they are combining to form a new product, and a new compound, water is synthesized here, this reaction is said to be a synthesis reaction.
      - Also, it is an unbalanced equation, because, in the reactant side, there are 2 atoms of oxygen, but on the product side, there is only one atom of oxygen. An equation or a chemical reaction is valid only when the number of moles of reactants is equal to number of moles of products.
      - Since the participating elements atom numbers should remain proportionately constant before and after the reaction, add 2 in front of H2O, to make the number of oxygen atoms equal to 2.
      - Now there are 4 hydrogen on the right side, but only 2 on the left side. So add 2, in front of H2, to make it equal to 4, i.e.,
        
        2H2 + O2 →
        
        →
        
        2H2O
- - - - ZnSO4 + H2