June 2015 Chemistry Regents #6-10
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Questions | Answer | Links | Explanations |
6. At STP, which substance has metallic bonding? (1) ammonium chloride (3) iodine (2) barium oxide (4) silver | 4 | Link | 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 |
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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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