June 2016 Chemistry Regents #56-58

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Question 51 Questions 52-53 Questions 54-55 Questions 56-58 Questions 59-60 Questions 61-62 Questions 63-65 Questions 66-69  Questions 70-71  Questions 72-74  Questions 75-77  Questions 78-81  Questions 82-85

 

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Question 56-58

 

  Base your answers to questions 56 through 58 on the information below and on your knowledge of chemistry.

At standard pressure, water has unusual properties that are due to both its molecular structure and intermolecular forces. For example, although most liquids contract when they freeze, water expands, making ice less dense than liquid water. Water has a much higher boiling point than most other molecular compounds having a similar gram-formula mass.

56        Explain why H2O(s) floats on H2O(L) when both are at OoC. [1]

Answer--> H2O(s) is less dense than H2O(L)

57        State the type of intermolecular force responsible for the unusual boiling point of H2O(L) at standard pressure. [1]

Answer--> hydrogen bonding, dipole dipole to a lesser extent

58        Determine the total amount of heat, in joules, required to completely vaporize a 50.0-gram sample of H2O(L) at its boiling point at standard pressure?

Answer-->113,000J

             =2260J/g*50.0

on to Questions 59-60

 

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 Questions 52-53 Questions 54-55 Questions 56-58 Questions 59-60 Questions 61-62 Questions 63-65 Questions 66-69  Questions 70-71  Questions 72-74  Questions 75-77  Questions 78-81  Questions 82-85

 

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