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Chapter 13

Chapter 13


Department
Chemistry
Course Code
CHMA11H3
Professor
Jamie Donaldson
Chapter
13

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Chapter 13
13.1 Catching lizards
We can measure the rates of reactions that occur in times as short as several femtoseconds
(10-15)
The knowledge of reaction rates is not only practically important giving us the ability to
control how fast a reaction occurs but also theoretically important
13.2 The Rate of a Chemical Reaction
The rates of a chemical reaction is a measure of how fast the reaction occurs
-If a chemical reaction has a slow rate, only a small fraction of molecules react to
form products
-If a chemical reaction has a fast rate, a large fraction of molecules react to form
products
We usually express the measurement as a change in some quantity per unit of time
The rate of a chemical reaction is measured as a change in the amounts of reactants or
products divided by the change in time

The reaction rate is defined as the negative of the change in concentration of a reactant
divided by the change in time
Reactant concentration decrease as a reaction proceeds; therefore the change in the
concentration of a reactant is negative
Product Concentrations increase as the reaction proceeds, the change in concentration of a
product is positive. Therefore, when the rate is defined with respect to a product, we do not
include a negative sign in the definition
The reactant concentration decreases with time because reactants are consumed in a
reaction
The product concentration increases with time because products are formed in a reaction
The rate is the average rate within the give time interval
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