Chemistry Worksheet! $10 for whole thing! :) pretty simple!

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timer Asked: Mar 20th, 2015

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Chemm.pdf

please give as complete, full worked out answers as you can, and for the graphs please use a drawing tool to help give correct answers! :) if not 100% sure about an answer please mention that as I can try to figure it out to get all right!

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CHEMISTRY 111 SECTION D Test 2 Name:_________________ Thursday, March 26, 2015 Part 1. Take home, please hand in on 3/26/15 prior to the in-class test. 26. At -5.0 0C, the gas phase reaction below occurs to form nitryl chloride. N2O4 + Cl2 à 2NO2Cl Experiment [N2O4]0 [Cl2]0 Initial rate of reaction of N2O4 (M/s) 1 0.100 0.020 2.50 x 102 2 0.100 0.040 2.48 x 102 3 0.200 0.020 4.98 x 102 From the table of rate and concentration experimental data, please determine the rate law (show all work): (2 points) Please determine the rate constant, k, and its units, at -5.0 0C: (2 points) In experiment 2, please calculate the initial rate of formation of nitryl chloride: (1 point) The reaction occurs in three steps as indicated, below. Kinetics studies demonstrate that the rate determining step is unimolecular, that the other two steps are bimolecular, that the steps become progressively faster as the reaction proceeds, and that the activation energy, Ea, is equal to 55 kJ/mol. Please fill in the gaps as needed: (7 points) Step 1: _______________ à _____ + _____ rate = k1____________ Step 2: _______________ à _______ rate = k2____________ Step 3: _______________ à _______ rate = k3____________ Overall: N2O4 + Cl2 à 2NO2Cl rate = ____________ Given that N2O4 disintegrates into two identical molecules in one of the steps, please complete the elementary step below showing each resulting molecule as a Lewis structure. Please also show on the reactant Lewis structure below which bond will most likely break. (3 points) à Using the “two point” version of the Arrhenius equation (textbook, page 472), please calculate the value of the rate constant at 25.0 0C: (2 points) Please determine the half-life, t1/2, at each of -5.0 0C and 25.0 0C (2 points) Please use Hess’s Law (CHE 110, chapter 8) to determine the enthalpy change that accompanies the overall reaction. Please show all work. (3 points) Given ΔH0f (N2O4) = 11.1 kJ/mol; ΔH0f (NO2Cl) = 12.6 kJ/mol Below, please sketch – to scale (1 box = 5 kJ/mol on y axis) – the reaction profile (potential energy vs. reaction progress) clearly labeling: the x and y axes; the reactants and products; the activation energy for each step; the enthalpy change of reaction (in this case, ΔE). (6 points) The reaction proceeds in a single step and has Ea = 35 kJ/mol when using a platinum metal catalyst. Please show this too on the sketch above using a dashed or dotted line for its profile. (2 points) 27. For the generic reaction A à products, please plot the following (y vs x), labeling the axes and slope (if linear): (6 x 2 points) [A] vs t (for Zero Order process) [A] vs t (for First Order process) rate vs [A] (for First Order process) rate vs [A]2 (for Second Order process) 1/[A] vs t (for Second Order process) ln k vs 1/TK (any order) 28. Please show all work used to derive answers in the calculations below: (4 x 2 points) a. normal boiling point of a solution made from 180.2 g glucose dissolved in 1.250 kg of water b. normal freezing point of a solution made from 180.2 g glucose dissolved in 1.250 kg of water c. normal freezing point predicted for a solution made from 58.44 g sodium chloride dissolved in 250.0 g of water d. osmotic pressure predicted for a solution made from 5.84 g sodium chloride dissolved in 200.0 mL of water at 25.0 0C
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