CHEM 111 17.1-17.7

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12 Terms

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avg. rate of a reaction: (equation)

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instantaneous rate of a reaction: (equation)

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Order

tells you how the concentration of reactants affects the speed (rate) of a chemical reaction

  • seen in rate laws

ex: 0 order: Changing the concentration of the reactant has no effect on the reaction rate


<p>tells you how the concentration of reactants affects the speed (rate) of a chemical reaction</p><ul><li><p>seen in rate laws</p></li></ul><p>ex: 0 order: <span>Changing the concentration of the reactant has </span><strong>no effect</strong><span> on the reaction rate </span></p><p></p>
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Rate Law + RXN Order

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Integrated Rate Law

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half life: t1/2

  • time it takes for ½ of “A” to be consumed in a rxn

  • half life is ONLY relevant for a 1st Order rxn


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When t = t1/2 → [A]0


= 2[A]t

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Reaction coordinate

the lowest NRG path from the reactants to the product

<p>the lowest NRG path from the reactants to the product</p>
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Transition state

the max NRG structure alone the Reaction coordinate

<p>the max NRG structure alone the <u>Reaction coordinate</u></p>
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Arrhenius Equation: (show T dependence of K)

  • (natural log of this equation is given info on exam)


<ul><li><p>(natural log of this equation is given info on exam)</p></li></ul><p></p>
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elementary rxn:

  • if reactants form products through ONLY 1 transition state

    • no intermediate (stable states) form; reactant molecules transform directly into product molecules


<ul><li><p>if reactants form products through ONLY 1 transition state</p><ul><li><p>no intermediate (stable states) form; reactant molecules transform directly into product molecules</p></li></ul></li></ul><p></p>
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Memorize this value for “R” constant