Rate Equations

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Last updated 11:29 AM on 4/22/26
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8 Terms

1
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Rate of reaction

The change in concentration of a substance in a given time

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Activation energy, Ea

The minimum energy required to start a reaction by the breaking of bonds

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What are the 5 factors that affect rate of reaction?

  • Concentration of solution

  • Pressure of a gas

  • Surface area of a solid

  • Temperature

  • Catalyst

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What is the rate equation?

Rate = k[A]m[B]n

  • [A] = Initial concentration of [A] in mol dm-3

  • [B] = Initial concentration of [B] in mol dm-3

  • m = Order with respect to [A]

  • n = Order with respect to [B]

  • k = rate constant

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Half-life

The time taken for the concentration of a reactant to half

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Rate determining step

The slowest step in a reaction mechanism

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The Arrhenius Equation

k = Ae -Ea/RT

  • k = rate constant

  • A = Arrhenius constant

  • Ea = Activation energy (Jmol-1)

  • R = 8.31 JK-1mol-1

  • T = Temperature (K)

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The Arrhenius Equation rearranged

lnk = lnA - Ea/RT