What are the nator new substances (molecules) in a chemical equation called?

A chemical reaction is the process in which atoms present in the starting substances rearrange to give new chemical combinations present in the substances formed by the reaction. These starting substances of a chemical reaction are called the reactants, and the new substances that result are called the products.

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.