What happens in a reaction if it is at chemical equilibrium?

The amount of the reactant is constantly decreasing.

The ratio of the products to reactants remains constant over time.

All of the products are used up.

There are no reactants in the system.

Answer    "a salt" would be the best answerexplanationsalts can be defined as ionic compounds that are neither acids nor bases. nacl is an example of a salt, and its ionic.an enzyme is an organic compound which is covalently bonded, not ionically bonded.acids are generally held together by covalent bondsan element does not need any bonds to exist

Ithink about 50 % of an original isotope's number of atoms remain

Answerstudying coal cumbustion as an energy source;