Question

complete
hypothesis 2 (particle size): if you
the particle size of a reactant, then the reaction rate
will increase because
of the reactant’s surface area is exposed allowing more particles to make
contact with each other.
done

Explanation:

For the first blank, to increase reaction rate via particle size, we decrease particle size (smaller particles have more surface area). For the second blank, when particle size is decreased, more of the surface area is exposed. So the first blank should be "decrease" and the second blank should be "more".

Answer:

First blank: decrease; Second blank: more