IB Chemistry Topic R2.2.11 Rate Constant Revision Notes (HL)

IB Chemistry Topic R2.2.11 Rate Constant Revision Notes (HL) | RevisionDojo

Written by official IB examiners

The Rate Constant and Its Units

Definition

Rate constant

The rate constant, $ k $, serves as a measure of how fast a reaction proceeds, and it varies with temperature.

For a given reaction, $k$ has a fixed value at a fixed temperature.
$k$ depends on temperature and on any catalyst, but not on concentration.
$k$ increases with temperature, which is why reactions speed up when heated. This is quantified by the Arrhenius equation (see R2.2.12).

Hint

A larger $k$ means a faster reaction at that temperature.
Because concentration does not change $k$, the whole temperature dependence of rate is carried by $k$.

Working Out the Units of k

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Lorem ipsum dolor sit amet, consectetur adipiscing elit.
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Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
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The Rate Constant and Its Units

Definition

Rate constant

The rate constant, $ k $, serves as a measure of how fast a reaction proceeds, and it varies with temperature.

For a given reaction, $k$ has a fixed value at a fixed temperature.
$k$ depends on temperature and on any catalyst, but not on concentration.
$k$ increases with temperature, which is why reactions speed up when heated. This is quantified by the Arrhenius equation (see R2.2.12).

Hint

A larger $k$ means a faster reaction at that temperature.
Because concentration does not change $k$, the whole temperature dependence of rate is carried by $k$.

Working Out the Units of k

Definition

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Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
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.

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 R2.2.11 Rate Constant Notes

The Rate Constant and Its Units

Working Out the Units of k

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The Rate Constant and Its Units

Working Out the Units of k

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Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

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