A chemical reaction that has a positive δg is correctly described as

Endergonic reaction or nonspontaneous reaction.

Explanation:

Gibbs free energy is a state function that determines the spontaneity or feasibility of the given reversible chemical reaction, at fixed pressure and temperature. It is given by the equation:

ΔG = ΔH - TΔS

Here, ΔG - change in Gibbs free energy

ΔH - The change in enthalpy of reaction

ΔS - The change in entropy

T - Temperature

When the change in the Gibbs free energy for a given reaction is positive (ΔG > 0), then that chemical reaction is known as an endergonic reaction or nonspontaneous reaction.