identify each of the following reactions as balanced or unbalanced.\nch₄ + 2o₂ → co₂ + 2h₂o:\ncacl₂ + 2agno₃…

Explanation:

Step1: Check elements in first reaction

For $CH_4 + 2O_2\rightarrow CO_2+2H_2O$, on left - hand side: 1 C, 4 H, 4 O. On right - hand side: 1 C, 4 H, 4 O. So it is balanced.

Step2: Check elements in second reaction

For $CaCl_2 + 2AgNO_3\rightarrow Ca(NO_3)_2+2AgCl$, on left - hand side: 1 Ca, 2 Cl, 2 Ag, 2 N, 6 O. On right - hand side: 1 Ca, 2 Cl, 2 Ag, 2 N, 6 O. So it is balanced.

Step3: Check elements in third reaction

For $3Fe_3O_4 + 4Al\rightarrow 9Fe+4Al_2O_3$, on left - hand side: 9 Fe, 12 O, 4 Al. On right - hand side: 9 Fe, 12 O, 8 Al. So it is unbalanced.

Answer:

$CH_4 + 2O_2\rightarrow CO_2+2H_2O$: Balanced $CaCl_2 + 2AgNO_3\rightarrow Ca(NO_3)_2+2AgCl$: Balanced $3Fe_3O_4 + 4Al\rightarrow 9Fe+4Al_2O_3$: Unbalanced