To find the unit rate for 1 bag of chips when 5 bags cost $6.25, we can divide the total cost by the number of bags.
The unit rate is calculated as follows:
\[ \text{Unit rate} = \frac{\text{Total cost}}{\text{Number of bags}} = \frac{6.25}{5} = 1.25 \]
Thus, the unit rate for 1 bag of chips is $1.25.