Answer:
The balanced chemical reaction has equal number of atoms in reactant side as well as product side.
Explanation:
The balanced chemical reactions is as follows.
1.
[tex]Zn+2HCl\rightarrow ZnCl_{2}+H_{2}[/tex]
2.
[tex]4Fe+3O_{2}\rightarrow 2Fe_{2}O_{3}[/tex]
3.
[tex]2H_{2}O_{2}\rightarrow 2H_{2}O +O_{2}[/tex]
4.
[tex]NaHCO_{3}+HC_{2}H_{3}O_{2} \rightarrow NaC_{2}H_{3}O_{2}+H_{2}CO_{3}[/tex]
[tex]H_{2}CO_{3}\rightarrow H_{2}O+CO_{2}[/tex]
[tex]NaHCO_{3}+HC_{2}H_{3}O_{2}\rightarrow H_{2}O+CO_{2}+NaC_{2}H_{3}O_{2}[/tex]
