Steve put 1/8 of the box of baking soda in each one of the five bottles to make them bubble up like volcanoes.
Step-by-step explanation:
Hi
As "Steve performed the chemistry experiment in which divided 5/8 of a box of baking soda evenly among the five bottles...", So we only have to make a simple division, therefore , so Steve put 1/8 of the box of baking soda in each one of the five bottles.