What type of reactions are associated with - Δ G?

Reactions associated with a negative change in Gibbs free energy (ΔG) are known as exergonic reactions. These types of reactions release energy into their surroundings, indicating that the processes can proceed spontaneously without needing an input of energy.

In this context, catabolic reactions are those that break down complex molecules into simpler ones, often releasing energy in the process, which aligns well with the characteristics of exergonic reactions. For example, cellular respiration is a catabolic reaction where glucose is broken down into carbon dioxide and water, resulting in a net release of energy.

The concept of spontaneity in relation to ΔG indicates that such processes tend to occur naturally, driven by the inherent tendency of systems to move towards lower energy states. Therefore, associating negative ΔG with exergonic and catabolic reactions is appropriate, as both highlight the energy-releasing nature and the ability to spontaneously mobilize the biochemical substrates needed for cellular function and metabolism.