Question

1. what are the coefficients when this equation is balanced?

cu + agno₃ → ag + cu(no₃)₂
options:
1,2,3,4
1,1,1,1
1,2,2,1
1,3,4,1

Explanation:

Step1: Identify the unbalanced equation

The unbalanced chemical equation is: $ \text{Cu} + \text{AgNO}_3
ightarrow \text{Ag} + \text{Cu(NO}_3\text{)}_2 $

Step2: Balance the nitrate ions ($\text{NO}_3^-$)

On the right side, in $\text{Cu(NO}_3\text{)}_2$, there are 2 nitrate ions. So we need 2 moles of $\text{AgNO}_3$ on the left to balance the nitrate ions. Now the equation becomes: $ \text{Cu} + 2\text{AgNO}_3
ightarrow \text{Ag} + \text{Cu(NO}_3\text{)}_2 $

Step3: Balance the silver (Ag) atoms

Now, on the left side, we have 2 Ag atoms from $2\text{AgNO}_3$. So we need 2 moles of Ag on the right. The equation is now: $ \text{Cu} + 2\text{AgNO}_3
ightarrow 2\text{Ag} + \text{Cu(NO}_3\text{)}_2 $

Step4: Check the copper (Cu) atoms

On the left, we have 1 Cu atom, and on the right, in $\text{Cu(NO}_3\text{)}_2$, we have 1 Cu atom. So copper is already balanced.

So the coefficients are 1 (for Cu), 2 (for $\text{AgNO}_3$), 2 (for Ag), and 1 (for $\text{Cu(NO}_3\text{)}_2$), which corresponds to the option "1,2,2,1".

Answer:

1,2,2,1 (corresponding to the option with coefficients 1,2,2,1)