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Chapter 13

Chapter 13

3 Pages
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Department
Chemistry
Course Code
CHMA11H3
Professor
Jamie Donaldson

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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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Description
Chapter 13 13.1 Catching lizards We can measure the rates of reactions that occur in times as short as several femtoseconds (10 )5 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 pr
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