Question

Complete the sentence: In chemical reactions, a substance that speeds up the reaction without being consumed is called a __________.

a) Catalyst
b) Reactant
c) Product
d) Inhibitor

Answer 1

A catalyst is a substance that increases the rate of a chemical reaction without undergoing any change. It helps increase the rate at which atoms, ions, and molecules collide.

Step-by-step explanation:

A catalyst is a substance that increases the rate of a chemical reaction without itself undergoing any change. It helps increase the rate at which atoms, ions, and molecules collide, thereby increasing the probability that their valence shell electrons will interact. Overall, a catalyst is not a reactant and is not used up in the reaction.