Kinetics 2005 AP ® Chemistry FRQ By: Jeffrey Chien.

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Kinetics 2005 AP ® Chemistry FRQ By: Jeffrey Chien

Iodide ion, I -, is oxidized to hypoiodite ion, IO -, by hypochlorite, ClO -, in basic solution according to the equation above. Three initial-rate experiments were conducted; the results are shown in the following table. Experiment[I - ] (mol L -1 ) [ClO - ] (mol L -1 ) Initial Rate of Formation of IO - (mol L -1 s -1 )

(a)Determine the order of the reaction with respect to each reactant listed below. Show your work. (i) I - (aq) (ii) ClO - (aq) (i)From experiments 1 and 2: The reaction is first order with respect to I -. (ii) From experiments 1 and 3: The reaction is first order with respect to ClO -.

(b) For the reaction, (i) write the rate law that is consistent with the calculations in part (a); (ii) calculate the value of the specific rate constant, k, and specify units. (i) rate = k[I - ] 1 [ClO - ] 1 (ii)

The catalyzed decomposition of hydrogen peroxide, H 2 O 2 (aq), is represented by the following equation. The kinetics of the decomposition reaction were studied and the analysis of the results show that it is a first-order reaction. Some of the experimental data are shown in the table below. [H 2 O 2 ] (mol L -1 ) Time (minutes)

(c) During the analysis of the data, the graph below was produced. (i) Label the vertical axis of the graph. (ii) What are the units of the rate constant, k, for the decomposition of H 2 O 2 (aq)? (iii) On the graph, draw the line that represents the plot of the uncatalyzed first-order decomposition of 1.00 M H 2 O 2 (aq). (i) Time (minutes) ln[H 2 O 2 ] (ii) minutes -1 (iii) Time (minutes) ln[H 2 O 2 ] uncatalyzed