Question

use the diagraming method to balance the following chemcial equations.

1. $\text{ag(no}_3\text{)} + \text{cu} \

ightarrow \text{cu(no}_3\text{)}_2 + \text{ag}$
before chem rxn
after chem rxn
$\underline{\quad\quad}\text{ag(no}_3\text{)} + \underline{\quad\quad}\text{cu} \
ightarrow \underline{\quad\quad}\text{cu(no}_3\text{)}_2 + \underline{\quad\quad}\text{ag}$

Explanation:

Step1: Count nitrate ions

Reactant: 1 $\ce{NO3^-}$; Product: 2 $\ce{NO3^-}$. Add coefficient 2 to $\ce{Ag(NO3)}$:
$\ce{2Ag(NO3) + Cu -> Cu(NO3)2 + Ag}$

Step2: Balance silver atoms

Reactant: 2 Ag; Product: 1 Ag. Add coefficient 2 to $\ce{Ag}$:
$\ce{2Ag(NO3) + Cu -> Cu(NO3)2 + 2Ag}$

Step3: Verify all atom counts

Ag: 2 (reactant) = 2 (product); $\ce{NO3^-}$: 2 = 2; Cu: 1 = 1. Equation is balanced.

Answer:

$\ce{2Ag(NO3) + Cu -> Cu(NO3)2 + 2Ag}$
(The coefficients are 2, 1, 1, 2 respectively)