AP®︎ Chemistry: Topic 4.1 Flashcards

Master key terms and definitions for Topic 4.1 of AP Chemistry – Introduction for Reactions to help you prep for quizzes and the AP exam.

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Term

Physical Change

Definition

A change in form or properties that does not alter a substance's chemical composition.

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Physical Change
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A change in form or properties that does not alter a substance's chemical composition.

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Evidence of Chemical Change
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Possible signs include heat or light, gas formation, precipitate formation, and color change.

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Phase Change and Mixture Formation/Separation
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Common physical changes where state or arrangement changes, but chemical identity stays the same.

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Precipitate
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An insoluble solid that forms when two aqueous solutions react.

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Types of Chemical Reactions
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Synthesis: A + B → AB; decomposition: AB → A + B; single replacement: AB + C → AC + B; double replacement: AB + CD → AD + CB; combustion: hydrocarbon + O2 → CO2 + H2O.

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Chemical Change and Chemical Reaction
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A process in which atoms rearrange to form new substances with different compositions.

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Chemical Equation
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A symbolic representation of a reaction showing reactants, products, formulas, and relative amounts.

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