Question

how does a catalyst influence a chemical reaction? it speeds up or slows down a chemical reaction by direct participation. it reacts with products to increase the concentration of reactants. it decreases the amount of energy necessary for the reaction to proceed. it increases the total amount of products formed.

Explanation:

A catalyst is a substance that changes the rate of a chemical reaction without being consumed in the reaction. It lowers the activation - energy required for the reaction to occur, thus speeding up or slowing down the reaction. It does not change the amount of products formed in a reaction at equilibrium, nor does it react with products to increase reactant concentration.

Answer:

It speeds up or slows down a chemical reaction by direct participation.