June 2014 Chemistry Regents #51-54

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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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Questions 51-54

 

  51 Draw a Lewis electron-dot diagram for a molecule of bromomethane, CH3Br. [I]

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 52 Explain, in terms of atomic structure, why Group 18 elements on the Periodic Table rarely form compounds. [I]

Answer-->  have a full valence shell

NOT ACCEPTED- 8 valence electrons  (**He has 2)

 53 Explain, in terms of electrons, why the radius of a potassium atom is larger than the radius of a potassium ion in the ground state. [I]

Answer-->  potassium atoms have 4 principal energy levels and a potassium ion has 3

SAD, but allowable answer==> K+ has 1 less electron than a K atom

54 Identify the type of bonding in solid potassium. [I]

Answer-->   metallic  bonding
 

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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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