To find the unit rate for 1 bag of chips when 5 bags cost $6.25, you can divide the total cost by the number of bags:
\[ \text{Cost per bag} = \frac{\text{Total Cost}}{\text{Number of Bags}} = \frac{6.25}{5} \]
Calculating this:
\[ \frac{6.25}{5} = 1.25 \]
So, the unit rate for 1 bag of chips is $1.25.