Gibbs free-energy change ΔG

Last updated: 10/02/2020
OCR-A A-Level Chemistry Enthalpy and entropy Gibbs free-energy change ΔG
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  1. Which chemist discovered the idea of ‘free energy’?

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  2. What is the definition of free energy change?

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  3. What is the symbol for free energy?

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  4. What is the symbol for free energy change?

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  5. What is the Gibbs’ equation?

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  6. How can we calculate the total entropy change?

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  7. What does the ΔG stand for in the Gibbs’ Equation?

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  8. What does the ΔH stand for in the Gibbs’ Equation?

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  9. What does the TΔS stand for in the Gibbs’ Equation?

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  10. For a reaction to happen simultaneously, what must the entropy do?

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  11. Describe how spontaneous endothermic reactions are.

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  12. Describe how spontaneous exothermic reactions are.

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  13. Which of these factors will impact whether or not a reaction proceeds spontaneously?

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  14. Which of these factors will impact whether or not a reaction proceeds spontaneously?

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  15. What is needed for a spontaneous change to occur?

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  16. What is needed for a spontaneous change to occur?

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  17. Describe the feasibility of a spontaneous change when ΔG is negative, ΔS is positive and ΔH is negative.

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  18. Describe the feasibility of a spontaneous change when ΔG is positive, ΔS is negative and ΔH is positive.

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  19. Describe the feasibility of a spontaneous change when ΔG is negative at low temperatures, ΔS is negative and ΔH is negative.

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  20. Describe the feasibility of a spontaneous change when ΔG is negative at high temperatures, ΔS is positive and ΔH is positive.

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