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Title: AP Chemistry Unit 5 Notes from College Board session
Description: The topics are “5.1-5.3: Reaction Rates, Rate Law, and Concentration Changes,” “5.4, 5.7-5.9: Reaction Mechanisms and Rate Law,” and “5.5-5.6, 5.10-5.11 Collision Model, Reaction Energy Profiles, and Catalysis.” They are extremely detailed, with diagrams and tables. The notes could be used to review topics before doing practice problems and as a resource for the open book 2020 AP Chemistry exam on May 14.

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Unit 5 
5
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3: Reaction Rates, Rate Laws, and Concentration Changes 
5
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00 

1
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00 

0
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500 

6
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0833 

12
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250 

-0
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00 

-0
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00 

0
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125 

6
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0208 

24
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0625 

-0
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00 

-0
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00 



 

 

 

6
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250 


...
00 

+0
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00 

0
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125 

6
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0208 

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438 


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+0
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031 

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0052 

 
Rate of reaction is influenced by ​reactant concentrations, temperature, surface area,​ and 
catalysts 
➔ Anything that ​increases collisions​ will ​increase rate o​f a reaction 
 
5
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3: Concentration Changes Over Time 
Rate law relates rate of reaction to concentration of the reaction 
Integrated rate law​ relates concentration of the reaction to time 
 

 
 
5
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7-5
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4: Elementary Reactions 
➔ Rate law of elementary reaction can be inferred from stoichiometry of molecules 
participating in collision 
Overall: H​2​ (g) + 2 ICl (g) -> 2 HCl (g) + I​2​ (g) 
Step 1: H​2​ (g) + ICl (g) -> HI (g) + HCl (g) 
Step 2: HI (g) + ICl (g) -> HCl (g) + I​2​ (g) 
➔ For Step 1, rate = k[H​2​][ICl], orders based on the coefficients of reactants 
➔ For Step 2, rate = k[HI][ICl] 
 

5
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8: Reaction Mechanism & Rate Law 
Which of the elementary reactions represents a rate law for the overall reaction that is 
consistent with the proposed mechanism? 
Slowest step determines rate for reaction 
 
5
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5-5
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10-5
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5: Collision Model 
For an elementary reaction to successfully produce products, reactants must successfully 
collide​ to initiate bond-breaking and bond-making events 
Successful collisions have ​sufficient energy​ to overcome energy barriers and ​orientations 
that allow bonds to rearrange in required manner 
Increasing concentration of reactants​ will ​increase frequency​ of collisions but not affect 
the % of successful collisions 
Increasing temperature​ of reaction will ​increase frequency​ of collisions and ​increase % 
successful collisions 
Increasing surface area​ will ​increase frequency​ of collisions but will not affect the % of 
successful collisions 
Increasing pressure​ of reaction will ​increase frequency​ of collisions but will not affect the 
% of successful collisions 
 
5
...
10: Multistep Reaction Energy Profile 

 
High amount of activation energy to overcome first slow step 
 
5
Title: AP Chemistry Unit 5 Notes from College Board session
Description: The topics are “5.1-5.3: Reaction Rates, Rate Law, and Concentration Changes,” “5.4, 5.7-5.9: Reaction Mechanisms and Rate Law,” and “5.5-5.6, 5.10-5.11 Collision Model, Reaction Energy Profiles, and Catalysis.” They are extremely detailed, with diagrams and tables. The notes could be used to review topics before doing practice problems and as a resource for the open book 2020 AP Chemistry exam on May 14.