Reference no: EM132680885
Question 1: Express the rate of reaction in terms of the change in concentration of each of the reactants and products:
2D(g) + 3E(g) + F(g) → 2G(g) + H(g)
When [D] is decreasing at 0.1 mo1/L.s, how fast is [H] increasing?
Question 2: Define the half-life of a reaction. Explain on the molecular level why the half-life of a first-order reaction is constant.
Question 3: Phosgene is a toxic gas prepared by the reaction of bon monoxide with chlorine:
CO(g) + Cl2(g) → COCl2(g)
These data were obtained in a kinetics study of its format
| Experiment |
Initial [CO] (mol/L) |
Initial [Cl2] (mol/L) |
Initial Rate, (mol/k) |
|
1
2
3
4
|
1.00
0.100
0.100
0.100
|
0.100
0.100
1.00
0.0100
|
1.29X10 3
1.33X10-3
1.30X 10-29
1.32X10
|
(a) Write the rate law for the formation of phosgene.
(b) Calculate the average value of the rate constant.
Question 4: Consider the following mechanism:
(1) ClO-(aq) + H2O(l) ↔ HClO(aq) + OH-(aq) [fast]
(2) I-(aq) + HClO(aq) → HIO(aq) + Cl-(aq) [slow]
(3) OH-(aq) + HIO(aq) → H2O(1) + IO-(aq) [fast]
(a) What is the overall equation?
(b) Identify the intermediate(s), if any.
(c) What are the molecularity and the rate law for each step?
(d) Is the mechanism consistent with the actual rate law:
rate = k[ClO-][I-]?
Question 5: Benzoyl peroxide, the substance most widely used agaisnt acne, has a half-life of 9.8 X 103 days when refrigerated, long will it take to lose 5% of its potency (95% remaining
Question 6: Insulin is a polypeptide hormone released from the pancreas that stimulates fat and muscle to take up glucose. In a certain patient, it has a first-order half-life in the blood of 3.5 min. To maintain an adequate blood concentration of insulin, it must be replenished in a time interval equal to 1/k. How long is the time interval in this patient?