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

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

Options:

  1. At absolute zero
  2. At the melting point
  3. At the boiling point
  4. At the transition temperature

Correct Answer: At the transition temperature

Solution: 

The Gibbs Free Energy changes from negative to positive at the transition temperature, where the system shifts from one phase to another.

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

Practice Questions

Q1
At what temperature does the Gibbs Free Energy change from negative to positive?
  1. At absolute zero
  2. At the melting point
  3. At the boiling point
  4. At the transition temperature

Questions & Step-by-Step Solutions

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.
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