Exergonic reaction

Definition

An exergonic reaction is a chemical reaction that releases energy by breaking down complex molecules into simpler ones. It often involves the release of heat and increases the entropy of the system.

5 Must Know Facts For Your Next Test

1. Exergonic reactions have a negative Gibbs free energy (ΔG < 0).
2. These reactions are spontaneous and do not require an input of energy.
3. Cellular respiration is a prime example of an exergonic reaction in microbial metabolism.
4. Enzymes can catalyze exergonic reactions to increase their reaction rates.
5. The energy released from exergonic reactions can be harnessed for cellular processes like ATP synthesis.

Review Questions

• What is the sign of Gibbs free energy (ΔG) for an exergonic reaction?
• Can exergonic reactions occur spontaneously, or do they require external energy input?
• Give an example of an exergonic reaction relevant to microbial metabolism.

Related terms

Endergonic Reaction: A chemical reaction that absorbs energy, resulting in positive Gibbs free energy (ΔG > 0).

ATP Synthesis: The process by which cells generate ATP, often using the energy released from exergonic reactions.

Enzyme Catalysis:

The acceleration of a chemical reaction by a catalyst, typically a protein enzyme.