At what temperature does the Gibbs Free Energy change from negative to positive?

At what temperature does the Gibbs Free Energy change from negative to positive?

Correct Answer: Transition temperature

Step 1: Understand that Gibbs Free Energy (G) is a measure of the energy available to do work in a system.
Step 2: Know that when G is negative, the process is spontaneous (it can happen on its own).
Step 3: Recognize that when G is positive, the process is non-spontaneous (it needs energy to happen).
Step 4: Identify that the transition temperature is the specific temperature at which the system changes from one phase (like solid to liquid) to another.
Step 5: Realize that at this transition temperature, the Gibbs Free Energy changes from negative to positive.

Gibbs Free Energy – A thermodynamic potential that measures the maximum reversible work obtainable from a closed system at constant temperature and pressure.
Phase Transition – The process where a substance changes from one state of matter to another, such as from solid to liquid or liquid to gas.
Transition Temperature – The specific temperature at which a phase change occurs, leading to a change in the sign of Gibbs Free Energy.