Transcription of Kinetics Free Response Sample Questions
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Kinetics Free Response Sample Questions
Kinetics Free Response Sample Questions Name: AP Chemistry Period: Date: RF Mandes, PhD, NBCT. Answer the following Questions on a separate sheet of paper 1971. Ethyl iodide reacts with a solution of sodium hydroxide to give ethyl alcohol according to the equation. CH3CH2I + OH- CH3CH2OH + I- The reaction is first order with respect to both ethyl iodide and hydroxide ion, and the overall-rate expression for the reaction is as follows: rate = k[CH3CH2I][OH-]. What would you do in the laboratory to obtain data to confirm the order in the rate expression for either of the reactants? Answer: The molar concentration of the hydroxide ion [OH -] can be determined by conducting the above reaction with a pH meter monitoring it. [OH-] = 1 10-14/-log pH. By measuring [OH-] over time and plotting ln[OH-] vs time, if a straight line results, the reaction is 1 st order with respect to [OH-].
0.00300 [0.01500][0.200] 0.000375 [0.00750][0.100] p p 42 m 2 = m (b) - 1 1 + 2 rate=k[Br][BrO][H ]3 (c) 0.00300=k[0.00100][0.01500][0.200]1 1 2 3 3 5.00 10 =3 L mol s k (d) E˚ = 1.52 + -1.065 V = 0.455 V (e) the overall reaction can be made by reversing …
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