IB Chemistry Topic R2.2.13 Arrhenius Factor Revision Notes (HL)

IB Chemistry Topic R2.2.13 Arrhenius Factor Revision Notes (HL) | RevisionDojo

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The Arrhenius Factor A: Collision Frequency and Orientation

$A$ is the pre-exponential (frequency) factor in the Arrhenius equation $k = Ae^{-\frac{E_a}{RT}}$.
It accounts for how often particles collide and the fraction of those collisions that have the correct orientation.
The exponential term $e^{-\frac{E_a}{RT}}$ handles the fraction of collisions with enough energy; $A$ handles frequency and geometry.

Note

Collision theory says a reaction needs frequent, correctly oriented, and sufficiently energetic collisions (see R2.2.2).
$A$ folds the first two of these together into a single factor.

Example

For small, simple molecules, $A$ tends to be large, because most collision orientations lead to reaction.
For large, complex molecules, $A$ is smaller, because fewer collisions have a workable orientation.

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The Arrhenius Factor A: Collision Frequency and Orientation

$A$ is the pre-exponential (frequency) factor in the Arrhenius equation $k = Ae^{-\frac{E_a}{RT}}$.
It accounts for how often particles collide and the fraction of those collisions that have the correct orientation.
The exponential term $e^{-\frac{E_a}{RT}}$ handles the fraction of collisions with enough energy; $A$ handles frequency and geometry.

Note

Collision theory says a reaction needs frequent, correctly oriented, and sufficiently energetic collisions (see R2.2.2).
$A$ folds the first two of these together into a single factor.

Example

For small, simple molecules, $A$ tends to be large, because most collision orientations lead to reaction.
For large, complex molecules, $A$ is smaller, because fewer collisions have a workable orientation.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

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Excepteur sint occaecat cupidatat non proident

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Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

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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 R2.2.13 Arrhenius Factor 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

The Arrhenius Factor A: Collision Frequency and Orientation

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The Arrhenius Factor A: Collision Frequency and Orientation

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