AP®︎ Chemistry: Topic 6.2 Flashcards

Master key terms and definitions for Topic 6.2 of AP Chemistry – Energy Diagrams to help you prep for quizzes and the AP exam.

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Term

Energy Diagram / Potential Energy Diagram

Definition

A graph of energy versus reaction progress showing reactants, products, and any energy barrier.

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Energy Diagram / Potential Energy Diagram
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A graph of energy versus reaction progress showing reactants, products, and any energy barrier.

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Axes of an Energy Diagram
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Vertical axis is potential energy; horizontal axis is reaction or process progress.

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Potential Energy of Reactants and Products
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The starting and ending energy levels shown for substances before and after a process.

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Activated Complex / Transition State
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The highest-energy, least stable arrangement of atoms at the top of the energy barrier.

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Enthalpy Change on an Energy Diagram
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Calculated as products minus reactants, giving the overall energy change, ΔH.

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Endothermic vs. Exothermic on an Energy Diagram
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Endothermic: products higher than reactants, ΔH positive; exothermic: products lower, ΔH negative.

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Representing Phase Changes with Energy Diagrams
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Physical changes can be graphed like reactions, showing energy absorbed or released during phase change.

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Phase Changes: Endothermic vs. Exothermic
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Melting, vaporization, sublimation absorb energy; freezing, condensation, deposition release energy.

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Latent Heat
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Energy absorbed or released during a phase change without a temperature change.

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Activation Energy
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The energy difference between the reactants and the peak, equal to the minimum energy needed to react.

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