Answer
a. Increase
b. Decrease
c. Decrease
d. Increase
Work Step by Step
a. Adding more reactant to a reaction increases its rate.
b. Lower temperature means less kinetic energy, and less collisions, decreasing the rate of the reaction.
c. Removing some reactant decreases the rate of the reaction.
d. A catalyst provides an alternative pathway with a lower activation energy, increasing the number of effective collisions, and consequently, the rate of the reaction.
