In a chemical reaction, an iron atom became the ion fe2+. what happened to the iron atom?
a. it lost electrons and was oxidized.
b. it lost electrons and was reduced.
c. it gained electrons and was oxidized.
d. it gained electrons and was reduced.

 The correct option is (A).

Explanation:

Oxidation Is a reaction in which loss of an electrons from an atom is involved in a reaction is known as oxidation.

Reduction Is a reaction in which gain of an electrons by an atom is involved in a reaction is known as reduction.

In a chemical reaction, an iron atom became the ion which means that iron atom by loosing two electrons from its valence shell has oxidized into positively charged ion.

So, the correct option (.A)

adding or remove a gaseous reactant or product changes the concentrations. if the concentration of reactant or product is increased, the system will shift away from the side in which concentration was increased (i.e. if the concentration of reactants is increased, the system will shift toward the products. if more products are added, the system will shift to form more reactants). conversely, if the concentration of reactant or product is decreased, the system will shift toward the side in which concentration was decreased (i.e. if reactants are removed, the system will shift to form more reactants. if the concentration of products is decreased, the equilibrium will shift toward the products).

explanation:

elements make up everything, and they combine to make compounds.

the answer is c