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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.
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
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3: Reaction Rates, Rate Laws, and Concentration Changes
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500
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Rate of reaction is influenced by reactant concentrations, temperature, surface area, and
catalysts
➔ Anything that increases collisions will increase rate of a reaction
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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
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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: H2 (g) + 2 ICl (g) -> 2 HCl (g) + I2 (g)
Step 1: H2 (g) + ICl (g) -> HI (g) + HCl (g)
Step 2: HI (g) + ICl (g) -> HCl (g) + I2 (g)
➔ For Step 1, rate = k[H2][ICl], orders based on the coefficients of reactants
➔ For Step 2, rate = k[HI][ICl]
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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
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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
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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.
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.