課程名稱︰普通化學乙
課程性質︰系定必修兼物質科學通識領域
課程教師︰牟中原教授
開課學院：工學院
開課系所︰材料系
考試日期（年月日）︰2007/01/16
考試時限（分鐘）：120 分鐘
是否需發放獎勵金：是,謝謝!
（如未明確表示，則不予發放）
試題 :
General Chemistry Final Exam (Materials Science and Engineering)
Total points: 100
1. Write Lewis structures for the followings. Where appropriate, use the
concepts of formal charge, expanded valence shells, and resonance to
choose the most likely structure(s).(12 points)
_ _ _ _
(a)SSF (b)I3 (c)H2CO3 (d)CN (e)SF5 (f)BrO3
2. The enthalpy of vaporization of carbon C(graphite)->C(g) ΔH= 717 KJ/mol
Use the value, the enthalpy of formation of methane (-74.87 KJ/mol), and
the bond-dissociation energy of hydrogen (436 KJ/mol) to calculate a value
for the average bond energy of C-H.(6 points)
3. Predict the molecular geometry of each of the following.(8 points)
_ +
(a)CO3 (b)PCl4 (c)N2O (d)CCl2F2
4. Propose a simple Lewis structur (or resonance structure), the molecular
geometry, and a bondin scheme for each of hte following.(6 points)
_
(a)HNO3 (b)AsF6 (c)CH3CCH
5. Show that the unit cell of calcium fluoride is consistent with the formula
CaF2. What type of holes the cation is located in? What are coordination
2+ _
numbers of Ca and F ? Would you expect them to be the same? Explain
(8 points)
6. The unit cell of diamond is shown here. Use the methods of unit cell
calculation and a carbon-tocarbon bond length of 154.45 pm to calculate
the density of diamond.(10 points)
7. Explain the following terms and given an example of application.(30 points)
(a)Supercritical fluid, its property and its use
(b)Triple point and its use: how to obtain it experimentally
(use CO2 as example)
(c)How do you measure the surface tension of a liquid?
(d)The origin of dispersion force between nonploar moleculses
(e)What quantities you need in Born-Habor Cycle, and what is the purpose of
Born-Harber Cycle?
8. Here are some data about an organic compound: Its normal boiling point is
a few degrees below H2O(l), and its vapor density at 93.0℃ and 758 torr
is within 10% of 0.00195 kg/L. Using these data and other information,
determine and explain which one of the following compounds its is likely to
be:(a) (CH3)2O (b)CH3CH2CH2OH (c)CH3CH2OCH3 (d)HOCH2CH2OH (10 points)
9. A compound consists of 2.1% H, 29.8% N, and 68.1% O has a molecular weight
of 50 g/mol.
(a) What is the molecular formula of the compound?
(b) What is the Lewis structure if H is bonded to O?
(c) What is the geometry of the molecule?
(d) what is the hybirdization of the orbitals around N?
(e) How many σ and how many π bonds are there in the molecule? (10 points)
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