January 2016 Chemistry Regents #69-72

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Questions 1-5 Questions 6-10 Questions 11-15 Questions 16-20 Questions 21-25 Questions 26-30 Questions 31-35 Questions 36-40 Questions 41-45 Questions 46-50

Question 51-53 Questions 54-56
 Questions 57-61 Questions 62-65 Questions 66-68 Questions 69-72  Questions 73-75  Questions 76-78  Questions 79-82 Questions 83-85

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Questions

 

  Base your answers to questions 69 through 72 on the information below.

Hydrazine, N2H4, is a compound that is very soluble in water and has a boiling point of 113C at standard pressure. Unlike water, hydrazine is very reactive and is sometimes used as a fuel for small rockets. One hydrazine reaction producing gaseous products is represented by the balanced equation below.

69 Compare the entropy of the products to the entropy of the reactant for this reaction. [1]

Answer==>products are greater

70 Based on Table S, determine the electronegativity difference for the N-H bond in hydrazine. [1]

Answer==>  0.8

71 Explain, in terms of molecular polarity, why N2H4 is very soluble in water. [1]

Answer==>water and hydrazine are polar

72 Explain, in terms of intermolecular forces, why the boiling point of hydrazine at standard pressure is higher than the boiling point of water at standard pressure. [1]

Answer==>Hydrazine has greater IMFs than water

 

 
 

Questions 1-5 Questions 6-10 Questions 11-15 Questions 16-20 Questions 21-25 Questions 26-30 Questions 31-35 Questions 36-40 Questions 41-45 Questions 46-50

Question 51-53 Questions 54-56
 Questions 57-61 Questions 62-65 Questions 66-68 Questions 69-72  Questions 73-75  Questions 76-78  Questions 79-82 Questions 83-85

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