推 SZMYmakoto :是鮪魚耶 12/20 18:30
課程名稱︰普通化學甲
課程性質︰必帶
課程教師︰佘瑞琳
開課學院：工學院
開課系所︰化工系
考試日期（年月日）︰2010/12/08
考試時限（分鐘）：100分鐘
是否需發放獎勵金：是
（如未明確表示，則不予發放）
試題 :
C=3.00*10^8m/s; h=6.626*10^-34J-s; RH=1.096776*10^7m^-1;
gas constant: R=8.314J/mol.K=0.082L.atm/mol.K; 1L.atm=101.3J
I.Multiple choice questions:(40%,2points/question)
1.A standing wave in a string 35cm long has a total of six nodes (including
those at the ends). What is the wavelength of this standing wave?
(a)5.0cm
(b)7.0cm
(c)10cm
(d)14cm
(e)35cm
2.Without doing detailed calculations, indicate which of the following electron
transitions in the hydrogen atom result in the emission of light of the longest
wavelength.
(a)n=4 to n=1
(b)n=1 to n=2
(c)n=1 to n=6
(d)n=3 to n=1
3.How many orbitals have the values n=3, l=2,and ml=0?
(a)0
(b)1
(c)2
(d)5
(e)9
4.Which quantum number defines the shape of an orbital?
(a)spin
(b)magnetic
(c)azimuthal(angular momentum)
(d)principal
5.What is the valence shell electron configuration of the halogens?
(a)ns2np6
(b)ns2np5
(c)ns2np3
(d)ns2
(e)ns1
6.The electron configuration for Cr2+ is
(a)[Ar]4s2 3d4
(b)[Ar]4s1 3d5
(c)[Ar]3d4
(d)[Ar]4s2 3d2
7.Which of the following sets contains species that are all isoelectronic?
(a)F,Cl,Br
(b)C4-,O2-,Na+
(c)Ca2+,Zn2+,Co2+
12 13 14
(d) C, C, C
8.Which of the following bonds has the greatest ionic character?
(a)H-N
(b)H-Br
(c)H-O
(d)N-O
9.For the following types of electromagnetic radiation: UV, microwave, IR, and
visible which of the following ranking is correct?
(a)Speed under vacuum: UV>visible>IR>microwave
(b)Energy: UV>visible>IR>microwave
(c)Wavelength: UV>visible>IR>microwave
(d)Wave number(ν=1/λ): UV>visible>IR>microwave
10.Which of the following transition occurs in the hydrogen atom is the
emission spectrum of visible light region?
(a)n=4 to n=2
(b)n=4 to n=3
(c)n=3 to n=1
(d)n=5 to n=4
11.From the following sets of quantum numbers (n,l,ml,ms), identify the set
that is correct.
(a)(2,1,0,0)
(b)(2,0,1,1/2)
(c)(2,-1,0,1/2)
(d)(2,1,0,-1/2)
12.WHich of the following orbital diagram is correct for the ground-state
electron configuration?
(a)↑↓ ↑↓ ↑ ↑
1s 2s 2p
(b)↑↓ ↑ ↑ ↑ ↑
1s 2s 2p
(c)↑↓ ↑↓ ↑ ↑ ↑
1s 2s 2p
(d)↑↓ ↑↓ ↑ ↓ ↑
1s 2s 2p
13.For the 4f subshell,
(a)The angular momentum quantum number is 3.
(b)The principal quantum number is 4.
(c)There are 16 orbitals in the subshell.
(d)It can be occupied by 6 electrons.
14.Which of the following atoms has 3 unpaired electrons?
(a)N
(b)O
(c)Al
(d)V
15.Which of the following ranking is correct?
(a)Ionic radius:N3- >O2- >F-
(b)Atomic size:I>Br>Cl
(c)First ionization energy:Cl>S>Si>Al
(d)Acidity:Na2O>CO2>NO2
16.Which of the following species would you expect to be diamagnetic?
(a)Mg
(b)Zn2+
(c)Co2+
(d)K+
17.Which of the following molecule has a trigonal planar geometry?
(a)PH3
(b)ClF3
(c)BCl3
(d)SO3
18.Which of the following molecule has the sp3 hybridization on the underlined
atom?
(a)HOCl
¯
(b)ClF3
¯
(c)CO3
¯
(d)AsF3
¯
19.Which of the following molecules would you expect to have a resultant dipole
moment(μ)?
(a)H2S
(b)XeF2
(c)CS2
(d)SO2
20.Which of the following statements concerning molecular orbital(MO) theory is
correct?
(a)The number of MOs formed equals the number of atomic orbitals combined.
(b)A set of MOs formed from 2 atomic orbitals involves 1 bonding and 1
antibonding orbital.
(c)Electrons normally enter the lowest energy MO available to them.
(d)Nomore than 2 electrons can enter a particular MO.
II.problem(60%)
1.The minimum energy required to cause the photoelectric effect in potassium
metal is 3.69*10^-19 J
(a)What is the threshold frequency of potassium to produce the photoelectric
effect?
(b)Will photoelectrons be produced when visible light shines on the surface of
protassium?
(c)If 400nm radiation is shone on potassium, what is the kinetic energy of the
ejected electrons?(10%,8.26)
2.A contour map for an atomic orbital of hydrogen is shown.
(a)Indicate the number of radial node and angular node.
(b)Identify the orbital.
(c)Indicate the values of quantum numbers, n and l, for the orbital.(p.333,10%)
3.(a)Draw Lewis structure for (N2O3)2-(the nitrogen atoms are joined centrally
with one oxygen atom on one N and two on the other).
(b)Show the formal charges and resonance.
(c)Indicate the most plausible structure.
(d)Use the VSEPR theory to pridict the approximate bond angles.(10.51,10%)
4.(a)Use bond energies from the table(10.3) to estimate the enthalpy change
(ΔH) for the following reactions: C2H2(g)+O2(g)→CO2(g)+H2O(g)
(b)balance the chemical reaction first.
(c)Use standard molar enthalpies of formation,ΔH°f(table7.2), to calculate
the standard enthalpy of reaction.(10%)
5.For the NO+ and NO,
(a)Draw the molecular orbital diagrams and
(b)write the electron configurations.
(c)Determine the bond orders.
(d)Show the magnetism ,i.e. paramagnetic or diamagnetic.
(e)Show the HOMO-LUMO energy gap in NO+ MO diagram.(10%,11.37)
6.The energy gap, ΔE, for silicon is 110kJ/mol.
(a)What is the maxium wavelength of light that can promote an electron from
the valence bond to the conduction band in silicon?
(b)In what region of the electromagnetic spectrom is this light?
(c)If we add trace amounts of arsenic(As) to the silicon would produce an
n-type or p-type semiconductor?
(d)Use the band theory to explain the conductivity of this extrinsic
semiconductor.(10%,11.55)
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