Spring 09 Recitation Quiz 9

Spring 09 Recitation Quiz 9 - CHEM 0120 Golde SPRING 2009...

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CHEM 0120 SPRING 2009 Monday 1:00 PM Golde QUIZ 9 WEEK 12 March 30, 2009 Name_______________________________ 1. Explain why the σ 2p * molecular orbital has a higher energy than the σ 2p molecular orbital. 2. a) State one naturally-occurring compound of sodium. b) Describe briefly how elemental sodium is manufactured, starting with a naturally- occurring compound. Include a balanced equation for any relevant reaction. 3. Write a balanced equation for each of the following reactions (a) Na 2 O(s) + H 2 O (b) SO 3 (g) + H 2 O ANSWERS 1. The * indicates an antibonding orbital, whereas the σ 2p molecular orbital is bonding. Formation of a bond is exothermic, thus the bonding orbital has lower energy than the antibonding orbital. 2. a) NaCl(s) or Na + ions in seawater. b) Electrolysis of fused (liquid) NaCl. Na + is reduced at the cathode: Na + (l) + e - Na(l or s) 3. (a) Na 2 O(s) + H 2 O 2 NaOH(aq) (b) SO 3 (g) + H 2 O H 2 SO 4 (aq) CHEM 0120 SPRING 2009 Monday 6:00 PM For Make-up Only Regular recitation Day: Time: instructor: Quiz Score: Group score: Scores recorded by:
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Golde QUIZ 9 WEEK 12 March 30, 2009 Name_______________________________ 1. The energy ordering of valence molecular orbitals arising from overlap of 2s and 2p atomic orbitals is σ 2s σ 2s * π 2p σ 2p π 2p * σ 2p *. a) How many valence electrons does the NO molecule (nitric oxide) contain? b) Determine the MO valence electron configuration of NO. 2. Consider the metals K and Zn. a) How many valence electrons does each metal have? b) Which metal is the more active ? c) Give the formula of the oxide of each element. d) One of these oxides is amphoteric. Which is that? Describe the acid/base properties of the oxide of the other metal. 3. Write a balanced equation for the following chemical reaction. K(s) + Cl 2 (g) ANSWERS 1. a) 5 + 6 = 11 valence electrons. b) σ 2s 2 σ 2s * 2 π 2p 4 σ 2p 2 π 2p *1 2. a) K: 1; Zn: 2 b) K c) K 2 O and ZnO d) ZnO is amphoteric; K 2 O is basic. 3. 2 K(s) + Cl 2 (g) 2 KCl(s) CHEM 0120 SPRING 2009 Tuesday 8:00 AM Golde QUIZ 9 WEEK 12 March 31, 2009 For Make-up Only Regular recitation Day: Time: instructor: Quiz Score: Group score: Scores recorded by:
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Name_______________________________ 1. O 2 2- (peroxide ion) has the molecular orbital valence electron configuration: σ 2s 2 σ 2s * 2 π 2p 4 σ 2p 2 π 2p * 4 . (a) Determine the bond order
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Spring 09 Recitation Quiz 9 - CHEM 0120 Golde SPRING 2009...

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