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UGA - CHEM 1212 - CHEM 1212 Week 4 Notes - Class Notes

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UGA - CHEM 1212 - CHEM 1212 Week 4 Notes - Class Notes

School: University of Georgia
Department: OTHER
Course: Freshman Chemistry II
Professor: Suzanne Ellenberger
Term: Spring 2017
Tags: Chemistry, chem1212, and genchem
Name: CHEM 1212 Week 4 Notes
Description: These notes cover Chemical kinetics and reaction rate laws and mechanisms.
Uploaded: 02/16/2018
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background image GENERAL CHEM 1212  University of Georgia  Week 4    Chemical Kinetics  Thermodynamics of a reaction are controlled by:  Enthalpy change of the reaction.  Entropy change of the reaction.  Temperature at which the reaction occurs.  Kinetics of a reaction are influenced by:  Pathway of the reaction (mechanism)  Activation energy of the reaction  Concentration of reactants  Temperature at which the reaction occurs.  Collision Theory  For a reaction to occur, reactants must come together with enough energy and 
proper orientation to react. 
Not all collisions meet these requirements  Concentration and Reaction Rate:  A reaction can only occur if reactants collide.  In a gas phase reaction, the number of collisions is dependent on the 
number of gas particles in the system. 
Increasing amount of reactants INCREASES total number of 
collisions. 
Temperature and Reaction Rate:  When a collision occurs, the reactants must have enough energy to 
overcome activation energy. 
Molecular Orientation and Reaction Rate:  When reactants collide, they must have the proper orientation to 
each other for a reaction to occur. 
As temperature INCREASES, so the probability of molecules having higher energy 
INCREASES. 
1   
background image Rates  Measure of some change over unit of time.  Average Rate of Change   Change in concentration over a timed interval.  Instantaneous Rate of Change  Change in concentration at a particular point in time.  A B C D → d   Rate=   a 1 Δt Δ[A] =   − b 1 Δt Δ[B] =   − c 1 Δt Δ[C] =   − d 1 Δt Δ[D]   Rate of Reaction  A measure of how quickly reactants are consumed  or products are made.    1. It is determined that dinitrogen pentoxide is consumed at a rate of 0.0080 M/min.  What quantity of oxygen (mol/L) is produced after 1 hour?  N O NO 2 2 5 → 4 2 O 2   A:    2   
background image Rate Laws  A B C D → d   ate k[A] [B] [C] R =   x y z   Integrated Rate Equations  Zero  Rate= k  First  Rate= k[A]  Second  Rate=  [A] k 2     2. A certain reaction is zero order in reactant A and 2nd order in reactant B. If 
concentrations of both reactants are doubled, what happens to the reaction rate? 
A: Rate of reaction is quadrupled because  ate k[A] [B] [B] r =   0 2 k 2   2 2 = 4   Half Life   Time it takes for half of reactants to be consumed.  t 1/2 = k ln2 (half life for a first order reaction)        3   

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School: University of Georgia
Department: OTHER
Course: Freshman Chemistry II
Professor: Suzanne Ellenberger
Term: Spring 2017
Tags: Chemistry, chem1212, and genchem
Name: CHEM 1212 Week 4 Notes
Description: These notes cover Chemical kinetics and reaction rate laws and mechanisms.
Uploaded: 02/16/2018
8 Pages 54 Views 43 Unlocks
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