Question

# If $\Delta G =$ negative for a reaction, then reaction is: A. exergonicB. endothermicC. exothermicD. endergonic

Favorable reactions have $\Delta G$ values that are negative. They are also called exergonic reactions.
Note: Knowledge of reactions and their relation with $\Delta G$ is required to solve these types of questions. When using Gibbs free energy to determine the spontaneity of a process, we are only concerned with changes in delta G rather than its absolute value. Exergonic reactions can be coupled to endergonic reactions. Oxidation-reduction (redox) reactions are examples of the coupling of exergonic and endergonic reactions. Enzymes often act by coupling an endergonic reaction to the exergonic hydrolysis of ATP.