University:
Bradley University
Course:
CHM 100 | Fundamentals of General Chemistry
Academic year:

2024
Views:

334

Pages:

5
Author:

Remington Spence

( 3 ) REACTION ENERGY DIAGRAMS  REACTION ENERGY DIAGRAM: - A graphical representation of the energy changes that occur during a reaction - y-axis: energy - x-axis: reaction progress (reactants  products) Here are some key concepts represented on reaction energy diagrams:  TRANSITION STATE: - Highest energy species formed in a reaction (very unstable)  ACTIVATION ENERGY (∆G‡): - Difference in energy between reactants and transition state - Determines how quickly a reaction occurs @ a given temp. - Larger ∆G‡ = slower reaction - Smaller ∆G‡ = faster reaction ( 3 ) REACTION ENERGY DIAGRAMS Parts of a reaction energy diagram: activation energy ( 3 ) REACTION ENERGY DIAGRAMS SOME POSSIBLE REACTION ENERGY DIAGRAMS: A.) fast exergonic reaction B.) slow exergonic reaction - small ∆G‡ , negative ∆G° - large ∆G‡ , negative ∆G° ∆G‡ Energy Energy ∆G‡ Reaction progress  Reaction progress  ( 3 ) REACTION ENERGY DIAGRAMS SOME POSSIBLE REACTION ENERGY DIAGRAMS: C.) fast endergonic reaction D.) slow endergonic reaction - large ∆G‡ , positive ∆G° Energy Energy - small ∆G‡ , positive ∆G° ∆G‡ Reaction progress  ∆G‡ Reaction progress  ( 3 ) REACTION ENERGY DIAGRAMS  REACTION INTERMEDIATE: - The carbocation which exists momentarily in a multi-step reaction - As soon as the intermediate forms, it reacts further to form the product - The intermediate cannot be isolated Intermediate This reaction has 2 ∆G‡ - It is a 2 step reaction