QUESTION 3 The following elementary steps are proposed for a reaction mechanism: 1. Cl2 (9) —...
The following mechanism has been proposed for the gas-phase reaction of chloroform (CHCl3) and chlorine. Cl2 ⇌ 2Cl (fast, reversible) Cl + CHCl3 → HCl + CCl3 (slow) Cl + CCl3 → CCl4 (fast) What rate law does this mechanism predict? (Choose from the list below and enter your answers in alphabetical order, e.g. ABC ). A)k G) [CHCl3]1/2 M) [CCl3]2 B) [Cl2] H) [CCl3]1/2 N) [HCl]2 C) [Cl] I) [HCl]1/2 O) [Cl2]2 D) [CHCl3] J) [Cl2]1/2 P) [Cl]2 E)...
The following mechanism has been proposed for the gas-phase reaction of chloroform (CHCl3) and chlorine. Cl2 ⇌ 2Cl (fast, reversible) Cl + CHCl3 → HCl + CCl3 (slow) Cl + CCl3 → CCl4 (fast) What rate law does this mechanism predict? (Choose from the list below and enter your answers in alphabetical order, e.g. ABC ). A)k G) [Cl2]1/2 M) [CHCl3]2 B) [CCl3] H) [Cl]1/2 N) [CCl3]2 C) [HCl] I) [CHCl3]1/2 O) [HCl]2 D) [Cl2] J) [CCl3]1/2 P) [Cl2]2 E)...
3 of 15 A reaction proceeds by the following mechanism: 1. CH4+Cl2-CH3+HCI+CI 2. CH3+Cl2-CH3CI+CI What is the overall reaction? CH4+2Cl2-CH2CI+HCl+2C1- CH4+HCI-CH3CI+H2 OCH4+2Cl2-CH2Cl2+2HCI CH3+C1--CH3C1 4 of 15 Which reaction mechanism is consistent with the overall reaction, 2NO2+F22NO2F? O 1. NO2+F2-NO2F+F 2. NO2+FNO2F O 1. 2NO2-N204 2. N204+F2-NO2F+NO2+F O 1. NO2+F2-NOF+O+F 2. NO2+F=NOF O 1. NO2+F2-NO2F2 2. 2NO2F2-2NO2F+F2
Question 1.b of 12 A reaction mechanism has the following proposed elementary steps: Step 1: A B +C Step 2: A+B →D Step 3: 2 A+D → C+E The overall reaction is 4 A 2 C + E. Which species are intermediates in this reaction? A) B and C B) B C) B and D D) D E) C and D
5 pts Question 9 The reaction CHCl3(g) + Cl2(g) —— CC14(g) + HCl(g) has the rate law: Rate = k[CHCl3][C12] If the concentration of CHCl3 is increased by a factor of five while the concentration of Cl2 is kept the same, the reaction rate will O double triple increase by a factor of five decreased by a factor of one-fifth
3. Use the proposed reaction mechanism to answer the following questions; Elementary 1: 2NO2Cl <---> ClO2 + N2O + ClO Elementary 2: N2O + ClO2 <---> NO2 + NOCl Elementary 3: NOCl + ClO ---> NO2 + Cl2 a) What is the overall (reduced) reaction? b) Identify any intermediates. c) Determine the rate law expression for each elementary reaction. (fast) (fast) (slow)
To understand how elementary steps make up a mechanism and how the rate law for an elementary step can be determined. Very often, a reaction does not tell us the whole story. For instance, the reaction NO2(g)+CO(g)→NO(g)+CO2(g)NO2(g)+CO(g)→NO(g)+CO2(g) does not involve a collision between an NO2NO2 molecule and a COCO molecule. Based on experimental data at moderate temperatures, this reaction is thought to occur in the following two steps: NO2(g)+NO2(g)→NO3(g)+NO(g)NO2(g)+NO2(g)→NO3(g)+NO(g) NO3(g)+CO(g)→CO2(g)+NO2(g)NO3(g)+CO(g)→CO2(g)+NO2(g) Each individual step is called an elementary step. Together, these...
Consider the following three step mechanism for a reaction Cl2 > 2Cl Fast Cl+CHCl3 > HCl+CCl3 Slow Cl+CCl3 > CCl4 Fast What is the predicted rate law? How do you do it? The answer is rate=K[Cl2]^.5 [CHCl3]
The following mechanism, proposed for the decomposition of hydrogen peroxide is composed of 2 elementary steps: H2O2(aq) + I'(aq) > H2O(l) + 10 (aq) 10 (aq) + H2O2(aq) -> H2O(l) + O2(g) + I'(aq) The rate law predicted by the mechanism is slow fast a) rate = k [H2O2) b) rate =k [H202][I] c) rate =k [H2O2][10] d) rate = k [H202) [1]
Question 7 1 pts The following two-step mechanism has been proposed for the gas phase decomposition of nitrous oxide: N20 (g) → N2 (g) + O (g) step 1 N20 (g) + O (g) - N2(g) + O2(g) step 2 Overall Reaction: 2 N20 (g) → 2N2 (g) + O2 (g) What is the molecularity of the first and second elementary steps of the mechanism? The first step is termolecular, and the second step is bimolecular, Both steps are bimolecular,...