Question

Select the correct answer.
Which change will decrease the number of effective collisions during a chemical reaction?
A.
adding a catalyst
B.
increasing the surface area
C.
decreasing the temperature
D.
increasing the reactant concentrations
E.
increasing the volume of the reactants

Answer 1

C. decreasing the temperature

Decreasing the temperature will lower the kinetic energy of the molecules, which in turn reduces the number of effective collisions during a chemical reaction.