推 ALegmontnick: 01/10 03:03
課程名稱︰普通化學丙
課程性質︰系定必修
課程教師︰周必泰
開課學院:醫學院
開課系所︰醫學系
考試日期(年月日)︰971107
考試時限(分鐘):30
是否需發放獎勵金:是
(如未明確表示,則不予發放)
試題 :
Quiz 2. General Chemistry丙 (總分40分) 2008/11/7
1.請寫出鋰、鈉、鉀、氦、硼 元素的英文全名 (10)
2.Nitrous oxide (N2O) has three possible Lewis structures:
: : ..
N=N=O ←→ :N≡N-O ←→ : N—N≡O:
: : ..
Given the following general bond-length information
。 。 。
N-N 1.67A N=N 1.20A N≡N 1.10A
。 。
N=O 1.15A N-O 1.47A
a.Write down the formal charge for each Lewis stucture (5)
。
b.Rationalize the observations that the N-N bond length in N2O is 1.12A and
。
that the N-O bond length is 1.19A. (5)
3.consider the following energy changes
△E (KJ/mol)
──────────────────────────
+ -
Mg(g) → Mg (g) + e 735
+ 2+ -
Mg (g)→ Mg (g) + e 1445
- -
O(g) + e → O (g) -141
- - 2-
O (g)+ e → O (g) 878
2+ 2- + -
a.Magnesium oxide exists as Mg O , not as Mg O . Explain. (5)
b.What experiment could be done to confirm that magnesium oxide does not exist
+ -
as Mg O ? (5)
4. Use VSEPR model to draw the geometry of
a. XeCl2 (5) b.ICl3 (5)
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