Gibbs Energy Change And Equilibrium
Chapter Name : Thermodynamics |
Sub Topic Code : 102_11_06_07_01 |
Topic Name : Gibbs Energy Change And Equilibrium |
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Sub Topic Name : Gibbs Energy Change And Equilibrium |
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Introduction
Gibbs energy or Gibbs function, G, is a state function and an extensive property which helps to find out the direction of the spontaneous change of processes taking place in open and closed systems: • For endothermic reactions, ?rH? may be large and positive (+). • In such a case, value of K << 1 and the reaction is unlikely to form much product. • In case of exothermic reactions. • ?rH? is large and negative, and ?rG? will be large and negative too. • And, K >> 1 and reaction goes near to completion.
Pre-Requisites:
Enthalpy, lattice structure, energy, exothermic, endothermic
Activity:
Lighting a matchstick is an exothermic reaction.
Real Life Question:
Is melting of ice an exothermic or endothermic reaction?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| equilibrium | • Balance. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Burning a candle | A candle spontaneously starts burning when the wax comes in contact with the flame. The candle also releases energy. |
Real life uses :
Lighting a matchstick, candle.
Places to visit :
Kitchen.
Practical examples around us
| Examples | Explainations |
|---|---|
| Lighting a candle | Wax particles spontaneously burn when they come in contact with fire. |
What you learn in Theory:
Gibbs energy or Gibbs function, G, is a state function and an extensive property which helps to find out the direction of the spontaneous change of processes taking place in open and closed systems.
What you learn in Practice:
• For endothermic reactions, ?rH? may be large and positive (+). • In such a case, value of K << 1 and the reaction is unlikely to form much product. • In case of exothermic reactions. • ?rH? is large and negative, and ?rG? will be large and negative too. • And, K >> 1 and reaction goes near to completion.