Chapter 13 - Rates of the reactions Reaction rates are...

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Rates of the reactions Reaction rates are affected by: a. Concentration b. Pressure (for gaseous reactions) c. Surface area d. Presence of a catalyst.
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Initial and instantaneous reaction rates Measurement of reaction rates: A parameter that could be easily measured is selected to measure rates of reaction. Graph is plotted. Initial reaction rate: Rate at t = 0. Instantaneous rate: Plot concentration-time graph. Select the time point. Draw the tangent at that point. Determine the slope of the tangent.
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Rate law: effect of concentration on reaction rates Reactions might be reversible. For defining rate law, the reverse reaction is neglected. a A + b B…. . g G + h H…. Rate law: rate = k[A] m [B] n ….. k=rate constant m, n, …. = order of the reaction with respect to the specific reactant. Over all order of the reaction = m + n + …. . The order of the reaction determines how the rate depends on concentration of the reactant . Order is an experimentally determined quantity. Order might/might not be equal to the stoichiometric coefficient. Can be 0, positive number, negative number or a fraction. Larger k faster reaction k depends on the reaction, temperature and presence of catalyst.
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aA Products Rate = k[A] 0 Rate = k [A] t = -kt + [A] 0 A plot of [A] t against time is a straight line with slope = -k and y-intercept is [A] 0 . http://bilbo.chm.uri.edu/CHM112/lectures/Image52.gif
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Chapter 13 - Rates of the reactions Reaction rates are...

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