Increasing concentration of substances in a chemical reaction will
select one:
a. increase reaction rate due to increased number of collision between particles.
b. decrease reaction rate due to increased number of collision between particles.
c. increase reaction rate due to increased energy of collision between particles.
d. decrease reaction rate due to increased energy of collision between particles.

if the surface area of reactants is larger,
select one:
a. the reaction rate is generally higher.
b. the reaction rate is generally lower.
c. the reaction rate is not affected.
d. the rate-determining step is eliminated.

decreasing the temperature of a reaction decreases the reaction rate because
select one:
a. decreasing the temperature also decreases the pressure.
b. decreasing the temperature may cause a reactant to solidify.
c. decreasing the temperature decreases the concentration of reactants.
d. decreasing the temperature lowers the average kinetic energy of the reactants.