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

4 Link

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

1 Link ethyne 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

1 Link Stable 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.

4 Link forming 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)

2 Link Avogadro's Hypothesis

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

 

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