Reaction rates are affected by concentration, collision geometry, and the presence of a catalyst. which of the following statements is false concerning these factors? increasing the concentration of reacting particles increases the chance for collisions. a catalyst lowers the activation energy requirement. a reaction occurs each time particles of the reactants collide. the slowest reaction involved in a reaction mechanism determines the rate of overall reaction.

The first one is FALSE

Answer:  A reaction occurs each time particles of the reactants collide.

Explanation:

A chemical reaction is a process in which the reactants combine together to form a product accompanied by breakage of old bonds and formation of new bonds.
It is not necessary that the reaction will occur each time the particles of reactants collide.
For a reaction to occur due to a collision, it is necessary for the particles to collide with enough energy such that the old bonds get broken and they collide in a proper orientation.
If the above conditions are not met, a chemical reaction will not occur even after a collision.