AP®︎ Chemistry: Topic 5.6 Flashcards

Master key terms and definitions for Topic 5.6 of AP Chemistry – Reaction Energy Profile to help you prep for quizzes and the AP exam.

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Term

Elementary Reaction

Definition

A reaction that occurs in a single step through one molecular event.

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Elementary Reaction
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A reaction that occurs in a single step through one molecular event.

5.6.A5.6.A.1
Reaction Coordinate
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The x-axis showing reaction progress as atoms rearrange from reactants to products.

5.6.A5.6.A.2
Reaction Energy Profile / Potential Energy Diagram
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A graph of potential energy versus reaction progress from reactants through a peak to products.

5.6.A5.6.A.3
Reactants, Transition State, and Products on an Energy Profile
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Left side starting substances, peak unstable arrangement, and right side final substances.

5.6.A5.6.A.3
Activation Energy
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The energy difference between the reactants and the transition state.

5.6.A5.6.A.3
Overall Energy Change
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The energy difference between products and reactants, indicating absorbed or released energy.

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Endothermic vs. Exothermic Energy Profiles
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Endothermic: products higher than reactants; exothermic: products lower than reactants.

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Bond Breaking and Bond Forming in Elementary Reactions
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Some bonds must be broken and new bonds formed during a single-step molecular event.

5.6.A5.6.A.1
Temperature and Effective Collisions
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Higher temperature increases the fraction of collisions energetic enough to reach the peak.

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Arrhenius Equation
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An equation relating a reaction's rate constant to temperature and activation energy.

5.6.A5.6.A.4
Transition State and Activation Energy Barrier
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The highest-energy arrangement reactants must reach before forming products in an elementary reaction.

5.6.A5.6.A.3