Answer:
A catalyst remains unchanged during a chemical reaction, as it does not actively participate in the reaction but it acts by reducing the activation energy necessary for the reaction occur.
Step-by-step explanation:
The question requires us to determine what happens to a catalyst during a chemical reaction.
A catalyst is a substance that is added to a chemical reaction with the purpose of increasing the rate of the reaction. The catalyst does not get used up or created during the reaction; instead, it remains unchanged as it does not participate directly in the chemical reaction.
A catalyst is able to increase the rate of the reaction by reducing the activation energy necessary for the reaction to happen. This happens because the catalyst changes the way that the reaction happens (the mechanism of the reaction), usually by forming an intermediate state with the reactants and being completely released from this intermediate at the end of the reaction.