For kinetic trial 2, Alicia was distracted when the color change occurred
1. Part A.4. Describe the chemistry that was occurring in the experiment between the time when solution A and B were mixed and Stop time.
Answer; Solution A and solution B were reacting with one another in order to create a compound with both starch and iodide. Once the solution had formed, a deep blue color was shown.
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Access Free Writing Tools2. Part A. 4. For kinetic trial 2, Alicia was distracted when the color change occurred but decided to record the time lapse read from her watch. Will this distraction cause an increase or decrease in the slope of the log (rate) versus log [I–]o? Explain
If you take the log of each side of the equation, you get:
Log(rate) = log k + n log [A]
This second equation would plot as a straight line with slope n. If you measure the slope of this line, you get the order of the reaction. As rate is independent of initial concentration, so its slope will not increase or decrease and will remain constant.
3. Part A, Table 24.1.
a. When doing the kinetic trials, Susan forgot to include the deionized water. Will this omission hasten or delay the formation of the blue color in the trials (exclusive of Trial 6)? Explain.
In the reaction initially iodide, under acidic conditions and in the presence of molybdate catalyst, reacts with hydrogen peroxide to give iodine gas.I2 then binds with I- iodide present in the solution to form triiodide which forms blue complex with starch.
H2O2 + 2 KI + H2SO4 → I2 + K2SO4 + 2 H2O
If deionized water is not added then the concentration of KI will be high , but it will react with H2O2 in the stoichometric ratio of 1:1 only,so H2O2 works as limiting reagent as it is lesser in concentration,thereby controlling the amount of I2 produced. So the amount of triiodide will not change, but the rate of reaction will increase for
I +I-↔I3- as rate of reaction is dependent on initial concentration of reactants.
Rate=k[I][I-]
As triiodide will form faster so faster will it react with starch giving blue colored complex.
c. When doing the kinetic trials, Peyton mistakenly omitted the starch solution from the kinetic trials. How will this omission change the appearance of the resultant solution (from the mixing solutions A and B) from that of a correctly completed experiment? Explain your reasoning.
d. Of the three chemists above, which chemist will have the most accurate results? Explain.
4. Part C.2. Review the plotted data.
a. What is the numerical value of the y-intercept?
b. What is the kinetic interpretation of the value for the y-intercept?
c. What does its value equal in equation 24.8?
C equals log k + log [I– ] p
5. State the effect that each of the following changes has on the reaction rate in this experiment—increase, decrease, or
no effect. (Assume no volume change for any of the concentration changes.)
a. An increase in the H2O2 concentration. Explain.
b. An increase in the volume of water in solution A. Explain.
6. If 0.2 M KI replaced the 0.3 M KI in this experiment, how would this affect the following—increase, decrease, or no effect?
a. The rate of the reaction. Explain
Will decrease because it depends on the amount of substance
b. The slopes of the graphs used to determine p and q. Explain
c. The value of the reaction rate constant. Explain.reported activation energy for the reaction—too high or too low? Explain
8. Part E.4. Arnie’s data plot has a greater negative slope than Bill’s. Which student will record the higher activation energy for the reaction? Describe your reasoning
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