What effect does a catalyst have on a reaction?A.A catalyst increases the concentrations of products.B.A catalyst contributes energy to a reaction.C.A catalyst speeds up the rate of a reaction.D.A catalyst makes it possible for a reaction to happen.

A catalyst is added to a reaction. Which of the following statements best describes the effect that a catalyst has on a reaction? Group of answer choicesThe catalyst gives the reactants more kinetic energyThe reaction rate is decreasedThe activation energy of the reaction is increasedThe activation energy of the reaction is decreased

What distinguishes a catalyst from other substances involved in a chemical reaction?Select one:a.A catalyst remains unchanged after the reaction.b.A catalyst is an intermediate in the reaction.c.A catalyst is produced during the reaction.d.A catalyst is consumed during the reaction.

What does the reaction rate say about a reaction?A.It tells what the concentration of reactants is.B.It tells if a catalyst was used in the reaction.C.It tells how quickly products will be made.D.It tells what activation energy the reaction has.

How does the rate of a reaction change after a catalyst is added?A.The rate increases.B.The rate becomes zero.C.The rate decreases.D.The rate remains the same.

A catalyst speeds up a chemical reaction as a result of which of the following?Group of answer choices It provides an alternate pathway with a lower activation energy It increases the number of collisions between reacting molecules. It makes the reaction more endothermic.  It makes the reaction more exothermic