June 2014 Chemistry Regents #59-61

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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 51-54 Questions 55-56 Questions 57-58 Questions 59-61 Questions 62-65 Questions 66-69 Questions 70-72 Questions 73-75  Questions 76-79  Questions 80-82  Questions 83-85

 

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Question 59-61

 

  Base your answers to questions 59 through 61 on the information below and on your knowledge of chemistry.

Ethane, C2H6, has a boiling point of -89°C at standard pressure. Ethanol, C2HsOH, has a much higher boiling point than ethane at standard pressure. At STP. ethane is a gas and ethanol is a liquid.

59  Identify  the class of organic compounds to which ethanol belongs. [I]

Answer--> Alcohol

 

60 A liquid boils when the vapor pressure of the liquid equals the atmospheric pressure on the surface of the liquid. Based on Table H, what is the boiling point of ethanol at standard pressure? [I]

Answer--> either 78 , 79 or 80oC

 

61 Compare the intermolecular forces of the two substances at STP. [1]

Answer--> ethanol has strong intermolecular forces

 

on to Questions 62-65

 

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 51-54 Questions 55-56 Questions 57-58 Questions 59-61 Questions 62-65 Questions 66-69 Questions 70-72 Questions 73-75  Questions 76-79  Questions 80-82  Questions 83-85

 

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