課程名稱︰普通化學丙
課程性質︰共同必修
課程教師︰牟中原
開課系所︰園藝/生機
考試時間︰2006 4/18 10:20~12:10
試題 :
1.Supply either a formula to match the name or a name to match the
formula for each of the following acids and bases.(8%)
(a)HBr (e)potassium iodide
(b)HNO2 (f)hydrogen peroxide
(c)H3PO3 (g)Ba(OH)2
(d)chlorous (h)1,2-dichloropropane
2.Magnesium-lithium alloy is used where its extremely low density is
a desirable property.A piece of this alloy weighing 0.0297g is analyzed
by adding HCl(aq).The liberated hydrogen gas was collected over water
at 19℃ and at atmosphereic pressure of 746 Torr and was found to
occupy 40.71mL.Calculate the percentages of magnesium and lithium
in the alloy.(Mg=24.3 , Li=6.9 , Cl=35.4) (15%)
3.Complete and balance the following equations.(10%)
(a) K(s) + H2O(l) ---->
(b) Ca(s) + H+(aq) ---->
(c) SO3(g) + KOH(aq) ---->
(d) Al2O3(s) + H+ ---->
(e) CaO(s) + H2O(l) ---->
4.Indicate what is wrong with each of the following Lewis structures.
Replace each with a more acceptable structures.(6%)
三個結構圖 (a)SCN (b)NO2 (c)NCl3
5.Assign formal charges to each atom in the following stuctures.(8%)
四個結構圖 (a)SO2 (b)NO2 (c)SO3- (d)BF4-
6.Propose a simple Lewis structure (or resonance structure),the molecuar
geometry,and a bonding scheme for each of the following.(8%)
(a) HNO3
(b) AsF6-
(c) CH3CCH
(d) XeF4
7.Assume that the energy-level diagrams of molecular orbitals obtained
from 2s and 2p atomic orbitals apply to the ions CN+ and CN-.(10%)
(a) Which ion has the stronger carbon-to-nitrogen bond? Explain.
(b) Is either of these ions paramagnetic? Explain.
8.Cesium metal is frequently used in photoelectric cells because the
amount of energy necessary to eject electrons from a cesium surface
is relatively small-only 206.5kJ/mol.What wavelength of light
(in nanometers) does this correspond to? (5%)
9.Given the following information,construct a Born-Haber cycle to
calculate the lattice energy of CaC2(s): (12%)
Net energy change for the formation of CaC2(s) = -60kJ/mol
Heat of sublimation for Ca(s) = +178kJ/mol
Ei1 for Ca(g) = +590kJ/mol
Ei2 for Ca(g) = +1145kJ/mol
Heat of sublimation for C(s) =+717kJ/mol
Bond dissociation energy for C2(g) = +614kJ/mol
Eea1 for C2(g) = +315kJ/mol
Eea2 for C2(g) = +410kJ/mol
10.The heat capacity of a bomb calorimeter is found to be 5.68kJ/℃.
When a 1.652g sample of glucose, C6H12O6 ,is burned in the calorimeter,
the temperature of the calorimeter increases from 24.56℃ to 29.10℃.
Caculate the △H,△U per mole at 298K for the following reaction: (10%)
( C=12.0 , H=1.0 , O=16.0 )
C6H12O6(s) + 6O2(g) ----> 6CO2(g) + 6H2O(g)
11.Give van der Waals equation and describe the meaning of the parameters
in the equation. (8%)
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◆ From: 218.161.0.21
※ 編輯: Motion 來自: 218.161.0.21 (04/18 23:47)