Chapter 15 Practice nteractive Activity Rate and the Rate Law Expression Resourc

Question

Chapter 15 Practice nteractive Activity Rate and the Rate Law Expression Resources previous I 1 of 9 l next Interactive Activity Rate and the Rate Law Expression Part A The rate of the reaction in terms of the disappearance of reactant includes the change in the concentration of the reactant, the time interval NOTE: These activities use Flash, and are therefore not and the coefficient of the reactant. Consider the following reaction: screen-reader accessible and may not work on a mobile device. If the browser you're using no longer supports 2A 3B 3C +2D Flash, try a different browser and download the Flash plug-in for this content The concentrations of reactant A atthree different time intervals are given. Use the following data to determine the average rate of reaction in terms of the disappearance of reactant A betwee time 0 s and time 20 s n The rate of reaction indicates the speed at which the Time (s) 0 20 40 reaction can occur, It can be expressed in terms of a change in the concentration of reactants or products per LA](M) 0.0800 0.0480 0.0360 unit of time concentration change Express your answer in molar concentration per second to three significant figures. rate The rate of reaction can be expressed either as a decrease in the concentration of a reactant per unit of Co time or as an increase in the concentration of a product per unit of time The rate of reaction M. Select the image to explore the activity that shows the different ways in which the rate of a reaction can be expressed Subm Hints My Answers Give Up Review Part a A+ b B Part B Express reaction rate in term The rate of the reaction in terms ofthe appearance of product includes the change in the concentration of the product, the time interval, and Disappearance of reactants" the coefficient of the product Appearance of products Consider the following reaction: Rate law expression 2A, 3B- 3C +2D "Noor that these methods of calculating rate do represent rate law The concentrations of product Cat three different time intervals are given. Use the following data to determine the rate of reaction in terms of Time (s) 0 20 40 ICI (M) 0.000 0.0480 0.0960 When you click on the Disappearance of reactants, the Appearance of products or the "Rate law expression Express your answer in molar concentration per second to three significant figures. button. vou wi observe different expressions for the rate

Explanation / Answer

(A)

rate = - d[A]/dT = - (0.0480-0.0800)/20-0 = 1.6*10^-3 M/s

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(B)

rate = 3/2 d[C]/dT = 3/2 *(0.0480-0.000/20-0 ) = 3.6 810^-3 M/s

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Part C

rate = k[A][B]^2

k = rate /[A][B]^2

   =0.06 M/s/(0.34)(0.26)^2 = 2.61 M^-2 s^-1

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