June 2015  Chemistry Regents #6-10

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Questions

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Explanations

6. At STP, which substance has metallic bonding?

(1) ammonium chloride       (3) iodine

(2) barium oxide                 (4) silver

4Link

Link 2

Ummm...pick the metal
7. What is the number of electrons shared between the carbon atoms in a molecule of ethyne?

(1) 6    (2) 2     (3) 8      (4)   4

1Linkethyne has a triple bond

each bond shares 2 electrons for a total of 6

8. Which atom in the ground state has a stable valence electron configuration?

(1) Ar   (2)  Al   (3)  Si   (4)   Na

1LinkStable electron configurations are full

Noble Gases, group 18

 

9.  Which occurs when two fluorine atoms react to produce a fluorine molecule?

(1) Energy is absorbed as a bond is broken.

(2) Energy is absorbed as a bond is formed.

(3) Energy is released as a bond is broken.

(4) Energy is released as a bond is formed.

4Linkforming bonds releases energy
10. Which gas sample at STP has the same number of molecules as a 2.0-liter sample of Cl2(g) at STP?

(1)  1.0 L of NH3(g)      (3)  3.0 L of CO2(g)

(2)  2.0 L of CH4(g)      (4)  4.0 L of NO(g)

2LinkAvogadro's Hypothesis

equal volumes of gas at the same conditions contain the same number of molecules

 

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

Questions 51-53 Questions 54-56 Questions 57-59 Questions 60-61 Questions 62-65 Questions 66-68 Questions 69-72 Questions 73-75  Questions 76-79  Questions 80-82  Questions 83-85

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