IB Chemistry R2.2.7 Energy Profiles and Transition States Notes

Energy Profiles: Visualising Activation Energy and Reaction Steps

An energy profile is a graph of energy against the progress of a reaction.

It shows the energy of the reactants, the products, and every stage in between.

Note

The horizontal axis is the reaction coordinate, which tracks progress from reactants to products.
The vertical axis is the potential energy of the system.

Key Features of an Energy Profile

Reactants and products

The start of the curve is the energy of the reactants; the end is the energy of the products.
In an exothermic reaction the products are lower than the reactants ($\Delta H < 0$).
In an endothermic reaction the products are higher than the reactants ($\Delta H > 0$).

Transition state

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IB Chemistry R2.2.7 Energy Profiles and Transition States Notes

Energy Profiles: Visualising Activation Energy and Reaction Steps

Key Features of an Energy Profile

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Energy Profiles: Visualising Activation Energy and Reaction Steps

Key Features of an Energy Profile

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Structure 1. Models of the particulate nature of matter5 subtopics

Structure 2. Models of bonding and structure4 subtopics

Structure 3. Classification of matter2 subtopics

Reactivity 1. What drives chemical reactions?4 subtopics

Reactivity 2. How much, how fast and how far?3 subtopics

Reactivity 3. What are the mechanisms of chemical change?4 subtopics

IB Chemistry R2.2.7 Energy Profiles and Transition States Notes

Structure 1. Models of the particulate nature of matter5 subtopics

Structure 2. Models of bonding and structure4 subtopics

Structure 3. Classification of matter2 subtopics

Reactivity 1. What drives chemical reactions?4 subtopics

Reactivity 2. How much, how fast and how far?3 subtopics

Reactivity 3. What are the mechanisms of chemical change?4 subtopics

Energy Profiles: Visualising Activation Energy and Reaction Steps

Key Features of an Energy Profile

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Energy Profiles: Visualising Activation Energy and Reaction Steps

Key Features of an Energy Profile

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