課程名稱︰普通化學丙
課程性質︰必修
課程教師︰鄭淑芬
開課學院：工學院
開課系所︰機械系
考試日期（年月日）︰99/04/01
考試時限（分鐘）：110min
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, 1st Mid-term Exam
1. Write the correct chemical formulas to distinguish between
(a) aluminum nitride and aluminum nitrite
(b) potassium chloride and potassium chlorite
(c) chloric acid and hydrochloric acid
(d) hydrogen sulfide and hydrosulfuric acid
(e) cobalt(III) nitride and cobalt(II) nitrite (10%)
2. The noble gas Kr in a natural sample consists of 0.3% 78Kr (molar mass
77.92 g.mol^-1), 2.3% 80Kr (molar mass 79.91 g.mol^-1), 11.6% 82Kr
(molar mass 81.91 g.mol^-1), 11.5% 83Kr (molar mass 82.92 g.mol^-1),
56.9% 84Kr (molar mass 83.91 g.mol^-1), and the rest being 86Kr (molar
mass 85.91 g.mol^-1). Calculate the molar mass of Kr. (4%)
3. Write the chemical formula of the following compounds: (6%)
4. A car tire is inflated at 18℃ to a pressure of 1.8 atm. After the car
has been driven for several hours, the volume of the tire expands from
7.8 L to 8.5 L and ther pressure increases to 2.0 atm. What is the
tire's temperature? (5%)
5. What is the maximum number of electrons that can have the following
quantum numbers: (5%)
(a) n = 4, l = 0
(b) n = 3, l = 1
(c) n = 2, l = 2
(d) n = 3, l = 2, ml = 0
(e) n = 1, l = 0, ml = -1, ms = 1/2
6. Predict the numbers of total nodes, the plane nodes, and the spherical
nodes of the following orbitals:
(a) 3p (b) 3d (c) 4f (d) 6s (12%)
7. describe the contribution of the following scientists in understanding
the atomic structure and give the representative equations. (9%)
(a) Louis de Broglie (b) Werner Heisenberg
(c) Erwin Schrodinger
8. The wavelength of the vivid red color of Li is 670.8 nm. This photon
results from a transition from the 2p to the 2s level. The first
ionization energy of Li is 5.392 eV. (12%)
(a) What is the ionization energy of the 2p state in Li?
(b) What is Zeff for a 2p electron?
(c) If Li metal is irradiated with light of 195 nm, what is the maximum
velocity of the emitted electron?
(d) What is the wavelength of the matter wave of this emitted electron?
9. Copper metal has a density of 8.92 g.cm^-3 and its atomic radius is
128 pm (Atomic weight of Cu = 63.5).
(a) Is Cu in a body-centered cubic or face-centered cubic unit cell? (5%)
(b) How many copper atoms in a unit cell? (1%)
(c) What is the coordination number of the copper atom? (1%)
10. A mixture of silver and copper is used to braze the tubes of bicycles
together. The phase diagram for Ag-Cu is shown below. (10%)
(a) Describe the changes that occur as a mixture of 30% Ag and 70% Cu is
cooled from 1000℃ to room temperature.
(b) At what temperature does the first solid appear?
(c) does the first solid contain more or less copper than the original
solution? Estimate the composition is the first solid.
(d) At what temperature does the last portion of the mixture solidify?
11. Tungsten is a brittle metal, while gold is a very ductile metal.
(a) Sketch the stress-strain curves for these two metals.
(b) Which part of the curve reflects the elastic modulus? Which metal has
a larger elastic modulus?
(c) Which part of the curve reflects the ductility and brittleness for
these two metals? (6%)
12. Briefly explain the following terms, and give one application for each
of them. (9%)
(a) Hume-Rothery rules (b) shape memory alloy
(c) substitutional alloy
13. Account for each of the following observation: (20%)
(a) Group IB elements Cu, Ag, Au are referred to as coinage metals and are
relatively unreactive. In contrast, group IA elements are among the
most active metals.
(b) Zn has a lower melting point than Ca.
(c) The resistivity of Mn is the highest among the first row transition
metals.
(d) Generally, metals which are fcc (Cu, Ag, Au, Pt, Pb, Ni, Al etc.) are
more malleable and ductile than either hcp (Ti, Zr, Be) or bcc metals
(W, V, Mo, Cr, Fe).
(e) The values of electron affinity of Li, Na, K, Rb, Cs decrease in the
order of 60 > 53 > 48 > 47 > 46 kJ/mol., while those of F, Cl, Br, I
and At are 328 < 349 > 325 > 295 > 270 kJ/mol.
Useful informations:
gas constant, R = 0.08206 atm L mol^-1 K^-1 = 8.314 J mol^-1 K^-1
Avogadro constant N(A) = 6.022 x 10^23 /mol
Plank's constant, h = 6.626 x 10^-34 J.s = 6.626 x 10^-27 erg.s
1 atm = 760 mmHg = 760 Torr
1 eV = 96.487 kJ/mol
Speed of light, c = 2.9979 x 10^8 m/s
Mass of electron = 9.109 x 10^-31 kg
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 140.112.240.3