Answer
a. Adding some $SO_2$ would increase the rate of the reaction.
b. Increasing the temperature would increase the rate of the reaction.
c. Adding a catalyst would increase the rate of the reaction.
d. Removing some $O_2$ would decrease the rate of the reaction.
Work Step by Step
a. Adding more reactant to a reaction increases its rate.
b. Higher temperature means more kinetic energy, and more collision, increasing the rate of the reaction.
c. A catalyst provides an alternative pathway with a lower activation energy, increasing the number of effective collisions, and consequently, the rate of the reaction.
d. Removing some reactant decreases the rate of the reaction.
