August 2015  Chemistry Regents #36-40

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36 As the first five elements in Group 15 are considered in order of increasing atomic number, first ionization energy

(1) decreases

(2) increases

(3) decreases, then increases

(4) increases, then decreases

1 link Use Table S
1 link hydrogen bonding look for H with F, O or N
38 Which ion in the ground state has the same electron configuration as an atom of argon in the ground state?

(1) A13+    (3) K+

(2) O2-        (4) F-

3 link argon has 18 electrons

K+ has 18 electrons

19 lose 1=18

 

39 What is the number of pairs of electrons shared in a molecule of N2? (1) 1      (3) 3

(2) 2     (4) 6

3 link triple bond has 6 electrons or 3 pairs of electrons
40 Which statement explains why a CO bond is more polar than a FO bond?

(1) At STP, carbon has a greater density than fluorine.

(2) A carbon atom has more valence electrons than a fluorine atom.

(3) The difference in electronegativity between carbon and oxygen is greater than that between fluorine and oxygen.

(4) The difference in first ionization energy between carbon and oxygen is greater than that between fluorine and oxygen.

3 link BEND- Bonding electronegativity difference

Large difference is more polar

 

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Questions 51-54 Questions 55-57 Questions 58-59 Questions 60-61 Questions 62-65 Questions 66-68 Questions 69-72 Questions 73-74  Questions 75-76  Questions 77-78  Questions 79-80  Questions 81-82  Questions 83-85

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