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O D. The overall reaction is endothermic. O E-b labels a transition state. QUESTION 28 Which...
BO D Which of ten The reaction of A to B. B) The reaction of B...
BO D Which of ten The reaction of A to B. B) The reaction of B to C. C) The reaction of C to D. D) All three steps occur at the same rate: there is no rate-limiting step. E) The most exothermic step is rate-limiting. esaretim Rank the following carbocations in order of stability. (The most stable is first.) > III II B) II > > III C) III > > II I > Il > III D 36)...
Potential energy Reaction progress First, indicate on the diagram the activation energy, transition state, and the...
Potential energy Reaction progress First, indicate on the diagram the activation energy, transition state, and the change of enthalpy for every step of this step-wise process, as well as the change in enthalpy for the overall reaction. Then, answer the following questions: (i) How many elementary steps are there in the mechanism of this reaction? (ii) Which of these steps is the rate-determining step? (iii) How many of the individual steps are exothermic? (iv) Is the overall reaction endothermic or...
2). Consider the following intramolecular S2 reaction. no ♡ + HI A) (5 pts) Use the...
2). Consider the following intramolecular S2 reaction. no ♡ + HI A) (5 pts) Use the table of Bond Dissociation Enthalpies (at the back of the exam) to calculate the approximate ΔΗπη. B) (3 pts) Is the reaction endothermic or exothermic? Why? C) (6 pts) Draw the Reaction Energy Coordinate Diagram. Label the axes, reactant(s), product(s), transition state(s), intermediate(s), activation energy, and reaction enthalpy. D) (3 pts) In regards to entropy, would you expect the reaction to be favorable, or...
For the reaction below: a. Determine whether the reaction is energetically favorable at room temperature. Assume that ΔS...
For the reaction below:
a. Determine whether the reaction is energetically favorable at
room temperature. Assume that ΔS=O. Calculate the gas phase
enthalpy change using bond dissociation enthalpies at 25°C from the
table below. Hint: Be aware that the bond energy for the C-H bond
varies considerably and may change during the reaction; therefore,
you will find several entries for C-H bonds in the table. Include
the algebraic sign and specify units, e.g. -45 kJ/mol. Calculate to
the nearest single...
This question has multiple parts. Work all the parts to get the most points. 242 Table...
This question has multiple parts. Work all the parts to get the most points. 242 Table of Bond Dissociation Enthalpies C-H bond BDE (kJ/mol) C-X bond BDE (kJ/mol) X2 and EX bonds BDE (kJ/mol) CH3-H 439 CH3-I IL 151 CH3-H 422 C,HS-I 238 HI 297 (CH3), CH-H 414 (CH3)2CH-I 238 (CH3),C-H 405 (CH3),CI 234 CH3 CH3CHCH2CH2 CH3 + HI CH3CHCH2CH3 1 Using the table of bond dissociation energies in the first part of this question: Calculate AH for this reaction...
10 of 15 Questions < O Assignment Score: 1210/1500 Resources Hint Check Answer 6 Question 1 of Attempts 100/100 Corr...
10 of 15 Questions < O Assignment Score: 1210/1500 Resources Hint Check Answer 6 Question 1 of Attempts 100/100 Correct Question 10 of 15 > 0/100 7 Question 6 of Attempts CH3 H3C-c. + CH3 CH3 H3C-C-Br Step 2 Br-Br → + Br. In Progress CH3 100/100 8 Question 1 of 0 Attempts Correct Overall reaction CH3 H3C-C-H CH3 + Br-Br - CH3 H3C-Ć-Br CH₃ + H-Br 9 Question 3 of Attempts 90/100 Correct A + B, calculate the enthalpy...
Question 12 (4 points) Which of the indicated C-H bonds has the lowest homolytic bond dissociation...
Question 12 (4 points) Which of the indicated C-H bonds has the lowest homolytic bond dissociation energy? Hc. A. H HD B. H B O A D O U Previous Page Next Page Page 6 of 20
QUESTION 10 Identify the product for the following sigmatropic rearrangement. O A. 0 B. II O...
QUESTION 10 Identify the product for the following sigmatropic rearrangement. O A. 0 B. II O C.III O D.IV O E. None of the above are correct. QUESTION 9 Predict the product for the following sigmatropic Claisen rearrangement. он OH IV O A. - OB. II O C. III O D. IV O O E. V QUESTION 8 Which diene and dienophile would react to give the following Diels-Alder product? 공동 10H 우 우 이에 그 OAT B. II oooo...
6. Which of the following statements is not true? A) Bond breaking is endothermic. B) The...
6. Which of the following statements is not true? A) Bond breaking is endothermic. B) The bond dissociation energy for bond breaking is always negative. C) Bond making is exothermic. D) The bond dissociation energy for bond formation is always negative. 37. Using the bond dissociation energies given, calculate AH® for the following reaction. CH,CH -Br + H2O CH,CH-OH + HBr AH KJ/mol Bond A-B CH3CH2-Br H-OH сHCH-он H-Br A) +108 KJ/mol B) -130 KJ/mol C) -22 KJ/mol D) +22...
This question has multiple parts. Work all the parts to get the most points. 1 pt...
This question has multiple parts. Work all the parts to get the most points. 1 pt 1 pt Table of Bond Dissociation Enthalpies C-H bond BDE (kJ/mol) C-X bond BDE (kJ/mol) X, and HX bonds BDE (kJ/mol) CH3-H 439 CH3-I 242 1 151 CH-H 422 CH3-1 238 HI 297 (CH3)2 CH-H 414 (CH), CH-I 238 (CH3),C-H 405 (CH),C-I 234 CH3 CH3CCH2CH3 CH3 CH3CHCH2CH3 HI Using the table of bond dissociation energies in the first part of this question: Calculate AH...
BO D Which of ten The reaction of A to B. B) The reaction of B to C. C) The reaction of C to D. D) All three steps occur at the same rate: there is no rate-limiting step. E) The most exothermic step is rate-limiting. esaretim Rank the following carbocations in order of stability. (The most stable is first.) > III II B) II > > III C) III > > II I > Il > III D 36)...
Potential energy Reaction progress First, indicate on the diagram the activation energy, transition state, and the change of enthalpy for every step of this step-wise process, as well as the change in enthalpy for the overall reaction. Then, answer the following questions: (i) How many elementary steps are there in the mechanism of this reaction? (ii) Which of these steps is the rate-determining step? (iii) How many of the individual steps are exothermic? (iv) Is the overall reaction endothermic or...
2). Consider the following intramolecular S2 reaction. no ♡ + HI A) (5 pts) Use the table of Bond Dissociation Enthalpies (at the back of the exam) to calculate the approximate ΔΗπη. B) (3 pts) Is the reaction endothermic or exothermic? Why? C) (6 pts) Draw the Reaction Energy Coordinate Diagram. Label the axes, reactant(s), product(s), transition state(s), intermediate(s), activation energy, and reaction enthalpy. D) (3 pts) In regards to entropy, would you expect the reaction to be favorable, or...
For the reaction below:
a. Determine whether the reaction is energetically favorable at
room temperature. Assume that ΔS=O. Calculate the gas phase
enthalpy change using bond dissociation enthalpies at 25°C from the
table below. Hint: Be aware that the bond energy for the C-H bond
varies considerably and may change during the reaction; therefore,
you will find several entries for C-H bonds in the table. Include
the algebraic sign and specify units, e.g. -45 kJ/mol. Calculate to
the nearest single...
This question has multiple parts. Work all the parts to get the most points. 242 Table of Bond Dissociation Enthalpies C-H bond BDE (kJ/mol) C-X bond BDE (kJ/mol) X2 and EX bonds BDE (kJ/mol) CH3-H 439 CH3-I IL 151 CH3-H 422 C,HS-I 238 HI 297 (CH3), CH-H 414 (CH3)2CH-I 238 (CH3),C-H 405 (CH3),CI 234 CH3 CH3CHCH2CH2 CH3 + HI CH3CHCH2CH3 1 Using the table of bond dissociation energies in the first part of this question: Calculate AH for this reaction...
10 of 15 Questions < O Assignment Score: 1210/1500 Resources Hint Check Answer 6 Question 1 of Attempts 100/100 Correct Question 10 of 15 > 0/100 7 Question 6 of Attempts CH3 H3C-c. + CH3 CH3 H3C-C-Br Step 2 Br-Br → + Br. In Progress CH3 100/100 8 Question 1 of 0 Attempts Correct Overall reaction CH3 H3C-C-H CH3 + Br-Br - CH3 H3C-Ć-Br CH₃ + H-Br 9 Question 3 of Attempts 90/100 Correct A + B, calculate the enthalpy...
Question 12 (4 points) Which of the indicated C-H bonds has the lowest homolytic bond dissociation energy? Hc. A. H HD B. H B O A D O U Previous Page Next Page Page 6 of 20
QUESTION 10 Identify the product for the following sigmatropic rearrangement. O A. 0 B. II O C.III O D.IV O E. None of the above are correct. QUESTION 9 Predict the product for the following sigmatropic Claisen rearrangement. он OH IV O A. - OB. II O C. III O D. IV O O E. V QUESTION 8 Which diene and dienophile would react to give the following Diels-Alder product? 공동 10H 우 우 이에 그 OAT B. II oooo...
6. Which of the following statements is not true? A) Bond breaking is endothermic. B) The bond dissociation energy for bond breaking is always negative. C) Bond making is exothermic. D) The bond dissociation energy for bond formation is always negative. 37. Using the bond dissociation energies given, calculate AH® for the following reaction. CH,CH -Br + H2O CH,CH-OH + HBr AH KJ/mol Bond A-B CH3CH2-Br H-OH сHCH-он H-Br A) +108 KJ/mol B) -130 KJ/mol C) -22 KJ/mol D) +22...
This question has multiple parts. Work all the parts to get the most points. 1 pt 1 pt Table of Bond Dissociation Enthalpies C-H bond BDE (kJ/mol) C-X bond BDE (kJ/mol) X, and HX bonds BDE (kJ/mol) CH3-H 439 CH3-I 242 1 151 CH-H 422 CH3-1 238 HI 297 (CH3)2 CH-H 414 (CH), CH-I 238 (CH3),C-H 405 (CH),C-I 234 CH3 CH3CCH2CH3 CH3 CH3CHCH2CH3 HI Using the table of bond dissociation energies in the first part of this question: Calculate AH...
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