Reaction Rate/Order

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Last updated 5:03 PM on 5/1/26
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12 Terms

1
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Reaction Rate

  • change in the concentration of a reactant or a product with time (M/s).

  • Can use ratios in moles in a chemical equation

  • Rates are Related to each other, Not Equal

<ul><li><p><span style="background-color: transparent;"><em><span>change in the concentration of a reactant or a product with time </span></em><span>(M/s).</span></span></p></li><li><p><span style="background-color: transparent;"><span>Can use ratios in moles in a chemical equation</span></span></p></li><li><p><span style="background-color: transparent;"><span>Rates are </span><strong><span>Related</span><em><span> </span></em></strong><span>to each other, </span><strong><span>Not Equal</span></strong></span></p></li></ul><p></p>
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Differential Rate Law

  • Based solely on Experimental Data

  • x and y are coefficients

  • k is the rate constant

<ul><li><p>Based solely on <strong>Experimental Data</strong></p></li><li><p>x and y are coefficients</p></li><li><p>k is the rate constant</p></li></ul><p></p>
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Reaction Order

  • sum of powers to which all reactant concentrations appearing in rate law are raised

    • x + y

    • won’t usually see greater than 3

<ul><li><p>sum of powers to which all reactant concentrations appearing in rate law are raised</p><ul><li><p>x + y</p></li><li><p>won’t usually see greater than 3</p></li></ul></li></ul><p></p><p></p>
4
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Meaning of Zero Order

  • If the concentration of your reactant changes, but the rate remains constant

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Meaning of First Order

  • If the concentration of your reactant doubles and the rate also doubles

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Meaning of Second Order

  • If the concentration of your reactant doubles and the rate quadruples

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Integrated Rate Laws

  • The mathematical equation that relates the concentration of a reactant or product to the time it takes for a reaction to occur. 

  • Cam calculates the concentration(reactant and product) or time for reaction

  • Need data which is linear (k) for the equation

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Zero Order Integrated Rate Law

  • Mainly seen for enzymes

  • Rate is Independent of the reactant concentration

<ul><li><p>Mainly seen for enzymes</p></li><li><p>Rate is <strong>Independent</strong> of the reactant concentration</p></li></ul><p></p>
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First Order Integrated Rate Law

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First Order Half Life

ONLY ONE ON REFERENCE SHEET

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Second Order Integrated Rate Law

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Units for Integrated Rate Laws

  • Based on orders.

  • Is 1/m(order-1)s

  • Ex.

    • 0 order: s

    • 1st order: 1/s

    • 2nd order: 1/ms