iPad 9:02 AM * 100% Exp. 3 - Kinetics Prelab: Attempt 1 Question Completion Stat
ID: 562995 • Letter: I
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iPad 9:02 AM * 100% Exp. 3 - Kinetics Prelab: Attempt 1 Question Completion Status: ESTION 3 The rate law for a generic reaction is rate k[A] [B]. This rate law is valid. (choose all that apply) A. for any temperature at which the reaction is performed. LB, with any concentrations of reactants. LIC, for any reaction that contains A and B. LD, only under specific temperature and concentration conditions. 2.00000 points Save Answer ESTION 4 In the experiment, you will be measuring the time it takes for the solution to turn blue. If you have initial concentrations of : 0.023 M. Bro3-0.023 M, H+-1.8x 10M, and S2032.0.006 M, what is the concentration of I-when the solution turns blue? Click Save and Submit to save and submit. Click Save All Answers to save all answers Save All Answers Close Window Save and SubmitExplanation / Answer
Q3.
a) True. But the rate constant may vary with temperature.
b) True.
Note : If one of the reactants in taken in excess, it may show a pseudo-first order reaction.
c) False. If one of the reactants reacts with A or B to give another product, then this rate law will be invalid.
d) False.
Q4.
Primary reaction :
2I - (aq) + S2O82-(aq) -----> I2 (aq) + 2 SO4-2 (aq)
The "clock" reaction is the reaction of a very small amount of S2O32- (thiosulfate) with the I2 produced in the primary reaction:
I2 (aq) + 2 S2O32- (aq) -----> 2I- (aq) + S4O62-(aq)
The stoichiometry of the second reaction shows that the number of moles of I- formed are requal to the the number of moles of S2O32-
The blue color will appear when 0.006 M I- has been formed by the primary reaction.
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