AP®︎ Chemistry: Topic 4.3 Flashcards

Master key terms and definitions for Topic 4.3 of AP Chemistry – Representations of Reactions to help you prep for quizzes and the AP exam.

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Term

Coefficients Vs. Subscripts

Definition

Coefficients change particle amounts; subscripts change a substance's identity and composition.

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Coefficients Vs. Subscripts
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Coefficients change particle amounts; subscripts change a substance's identity and composition.

4.3.A4.3.A.1
States Of Matter In Equations
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Symbols like s, l, g, and aq show each substance's physical state in a reaction.

4.3.A4.3.A.1
Representing Atoms, Molecules, And Ions
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Atoms are single spheres, molecules are bonded groups, and ions carry charges.

4.3.A
Formula Units In Ionic Compounds
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The lowest whole-number ratio of ions in an ionic compound, not a discrete molecule.

4.3.A
Proper Bonding And Separation In Particle Diagrams
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Bonded atoms should be connected, while separate ions or unbonded particles should be drawn apart.

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Balanced Chemical Equation
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A reaction written with whole-number coefficients so each element has equal atoms on both sides.

4.3.A4.3.A.1
Particulate Model
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A particle-level drawing made from a balanced equation showing the correct particles before and after.

4.3.A4.3.A.1
Law Of Conservation Of Mass
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Matter is conserved, so each element must have the same number of atoms before and after.

4.3.A
Physical Processes And Chemical Reactions
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Physical changes keep particle identity the same, while chemical changes rearrange atoms into new substances.

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Spectator Ion
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An ion present in solution that does not change during the reaction.

4.3.A