AP®︎ Chemistry: Topic 5.2 Flashcards

Master key terms and definitions for Topic 5.2 of AP Chemistry – Introduction to Rate Law to help you prep for quizzes and the AP exam.

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Term

Reaction Order and Overall Order

Definition

Each exponent gives order in one reactant; their sum gives the overall order.

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Reaction Order and Overall Order
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Each exponent gives order in one reactant; their sum gives the overall order.

5.2.A5.2.A.3
Rate Constant
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The proportionality constant in a rate law, whose value depends on temperature.

5.2.A5.2.A.4
Units of the Rate Constant
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Units vary with overall order: zero M/s, first s^-1, second M^-1 s^-1.

5.2.A5.2.A.4
Initial Rates Method
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Compare trials where one reactant concentration changes and others stay constant to find exponents.

5.2.A5.2.A.5
Experimental Determination of Rate Law
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Reaction orders must be found from measured rate data, not from coefficients in the balanced equation.

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Concentration Change and Rate Factor
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If concentration changes by a factor x, rate changes by x raised to that reactant's order.

5.2.A5.2.A.2
Solving for the Rate Constant
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Substitute one trial's rate and concentrations into the rate law, then isolate k.

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Monitoring Reaction Rate Experimentally
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Measure reactant disappearance or product formation over time to determine reaction rate.

5.2.A5.2.A.1
Rate Law
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An equation showing reaction rate as k times reactant concentrations raised to powers.

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Order with Respect to a Reactant
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The exponent of a reactant concentration in the rate law.

5.2.A5.2.A.3