January 2015 Chemistry Regents #11-15

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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 54-55
 Questions 56-58 Questions 59-61 Questions 62-63 Questions 64-65 Questions 66-68 Questions 69-72  Questions 73-75  Questions 76-78  Questions 79-81 Questions 82-85

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Questions

Answer Links

Explanations

11 Which compound has the greatest percent composition by mass of sulfur?

(1) BaS (3) MgS

(2) CaS (4) SrS

3 Link See Link
12 Two molecules of HBr collide and then form H2 and Br2. During the collision, the bonds in the HBr molecules are

(1) broken as energy is absorbed

(2) broken as energy is released

(3) formed as energy is absorbed

(4) formed as energy is released

1 Link Breaking a bond requires energy
13 Which atom in the ground state has a stable electron configuration? (1) carbon (3) neon

(2) magnesium (4) oxygen

3 Link Highest ionization energy has the most stable electron configuration

 

14 Which statement describes a multiple covalent bond?

(1) Two electrons are shared.

 (2) Four electrons are shared.

(3) Two electrons are transferred.

(4) Four electrons are transferred.

2 Link Covalent=Shared

each bond has 2 electrons

15 The electronegativity difference between the atoms in a molecule of HCl can be used to determine

(1) the entropy of the atoms

(2) the atomic number of the atoms

(3) the first ionization energy of the atoms

(4) the polarity of the bond between the two atoms

4 Link BEND-Bonding is Electronegativity Differences

 

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 54-55
 Questions 56-58 Questions 59-61 Questions 62-63 Questions 64-65 Questions 66-68 Questions 69-72  Questions 73-75  Questions 76-78  Questions 79-81 Questions 82-85

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