[試題] 101上 佘瑞琳 普通化學甲 第二次期中考
課程名稱︰普通化學甲
課程性質︰必修
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）︰2012/12/5
考試時限（分鐘）：110 min
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 * 10^8 m/s; h = 6.626 * 10^-34 J-s; RH = 1.096776 * 10^7 m^-1; Gas
constant: R = 8.314 J/mol-K = 0.082 L-atm/mol-K; 1 L-atm = 101.3J
I.Multiple choice questions (2 points per question, 40%)
1.A standing wave in a string 42 cm long has a total of six nodes(including
those at the ends). What is the wavelength, in centermeters, of this standing
wave ?
(a)7.0 cm (b)8.4 cm (c)17 cm (d)42 cm
2.The magnesium spectrum has a line at 266.8 nm. Which of these statements
about this radiation is correct ?
(a)It is visible to the eye
(b)It has a greater speed in a vacuum than does red light of wavelength 652
nm.
(c)Its photon has greater energy than that of red light of wavelength 652 nm.
(d)Its wavelength is longer than that of X-rays.
3.Calculate the de Broglie wavelength of an electron with a velocity of 6.00
* 10^6 m/s. The mass of the electron is 9.11 * 10^-28 g (λ = h/mu (matter
wave))
(a)8.25 * 10^9 m
(b)8.25 * 10^12 m
(c)1.21 * 10^-16 m
(d)1.21 * 10^-10 m
4.Predict which of the following electronic transitions produces the spectral
line have the longest wavelength.
(a)n = 2 to n = 1 (b)n = 3 to n = 2 (c)n = 4 to n = 3 (d)n = 3 to n = 1
5.An eletron having n = 3 and ml = 0
(a)must have ms = + 1/2
(b)must have l = 1
(c)must have l = 0, 1,or 2
(d)must have l = 2
6.From the following sets of quantum numbers (n, l, ml, ms), identify the set
that is correct
(a)(3, 2, -2, -1/2) (b)(2, 0, 1, 1/2) (c)(3, 0, 0, -1/2) (d)(4, 4, -4, -1/2)
7.Which of the following otbital diagram is correct for the ground-state
eletrons configuration
(a)[He] ↑↑ ↑ ↑ ↑
2s 2p
(b)[He] ↑↓ ↓ ↓ ↓
2s 2p
(c)[He] ↑↓ ↑ ↑
2s 2p
(d)[He] ↑↓ ↑ ↓ ↑
2s 2p
8.How many orbitals have the value n = 4 and l = 3 ?
(a)4 (b)7 (c)9 (d)16
9.What is the valence shell electron configuration of the halogens ?
(a)ns2 (b)ns2np1 (c)ns2np3 (d)ns2np5
10.Which one of the following is metalloid ?
(a)Ca (b)Ge (c)Ga (d)Co
11.Which one of the following set species is isoelectronic ?
- - -
(a)Cl , Br , I
2+ 2+ 2+
(b)Be , Mg , Ca
2+ 2+ 2+
(c)Zn , Co , Mn
3- - 2+
(d)N , F, Mg
12.Which of the following ranking is correct ?
2+ + - 2-
(a)Increasing size : Ca < K < Cl < S
(b)Increasing effective nuclear charge : Li < C < N < O
(c)Increasing first ionization energy : Sr < Sn < As < Br
(d)Increasing electronegativity : P < N < O < F
13.Which of the following ions are unlikely to be found in chemical compounds
?
4+ 2+ 2- 2-
(a) Ga (b)Na (c)F (d)S
14.Which of the following species would you expect to be diamagnetic ?
3+ 2+
(a)V (b)Zn (c)K (d)Cd
15.Which of the following would you expect to have the greatest bond length ?
(a)O2 (b)N2 (c)Br2 (d)BrCl
16.Which of the following bonds is most polar ?
(a)S-Cl (b)S-Br (c)Se-Cl (d)Se-Br
17.Which of the following molecule has the sp2 hybridization of the central
atom ?
2- -
(a)CO3 (b)NH3 (c)NO2 (d)SO2
18.Which of the following molucules would you expect to have a resultant
dipole moment(μ)?
(a)CS2 (b)H2S (c)CO (d)SO2
19.A contour map for an atomic orbital of hydrogen is shown.
(a)It shows one radial node.
(b)It is a p orbital
(c)The principal quantum number, n = 3
(d)The angular momentum quantum number, l = 3
20.Which of the following molecules or ions will exhibit delocalized bonding :
+
(a)SO3 (b)H2CO (c)NH4 (d)O3
II.Problems(60%)
1.
(a)For the photoeletric effect, briefly define the threshold frequency.
(b)The thresold frequency for indium is 9.96 * 10^14 s^-1 . What is the
energy, in joules, of a photon of this radiation ?
(c)What is the wavelength of this radiation ?
(d)Will indium display the photoelectric effect with UV light ?
(8%, 8.25)
2.Lactic acid has the formula CH3CH(OH)COOH.
(a)Sketch the lactic acid molecule, complete the Lewis structures, showing
all lone pairs.
(b)Give approximate values for bond angles.
(c)Give the hybridization of three carbon atoms.
(d)How many sigma and pi bonds are there in the molecules ?
(8%, 10.77)
3.The bond length in the HCl molecule is 1.27 A.
(a)Calculatte the dipole momentm, in debyes, that would result if the charges
on the H and Cl atoms were 1+ and 1-, respectively.
(b)The experimentally measured dipole moment of HCl(g) is 1.08 D. What
magnitude of charge, in units of e, on the H and Cl atoms would lead to this
dipole moment ?
(c)Calculate the ionic character of H-Cl bond.
e = 1.60 * 10^-19, 1 Debye (D) = 3.34 * 10^-30 C-m, 1 A = 1 * 10^-10 m (6%)
4. -
(a)Draw the Lewis structure of the polyatomic anion ICl4
(b)Using VSEPR theory to predict the geometric shape.
(c)Propose a plausible hybridization schemefor the central atom in the ion.
(6%, p.427)
5.For the following reaction : H2O(g) + Cl2(g) → 1/2 O2(g) + 2HCl(g).
(a)Using bond energies from the following table to estimate the enthalpy
change (△H) for the reaction.
(b)Is the reaction endothermic or exothermic ?
(c)Use standard molar enthalpies of formation, △Hf°, to calculate the
standard enthalpy of reaction. (8%, p.437)
6.The figure shown on the right (見課本 p.477, Figure 11-33 右下) is one of
the contour representations off molecular orbital (MO) of O3 molecule,
identify the followings:
(a)the type of MO (sigma or pi MO)
(b)the atomic orbitals (s or p) used to construct the MO
(c)whether the MO is bonding or antibonding
(d)the location of nodal plane (8%)
+ +
7.Consider the ions, NO , N2
(a)Draw the molecular orbital diagrams.
(b)Write the electron configurations.
(c)Determine the bond orders.
(d)Show the magnetism, i.e. paramagnic or diamagnic.
(e)Which of these ions do you think has the greater bond length ?
+
(f)Show the HOMO-LUMO energy gap in NO MO diagram. (10%, 11.37)
8.The energy gap, △E, for silicon is 110 kJ/mol.
(a)What is the maximum wavelength of light that can promote an electron from
the valence band to the conduction band in silicon ?
(b)If we add trace of boron(B) to the silicon would produce an n-type or
p-type semiconductor ?
(c)Use the band theory to explain the dependence of electrical conductivity
on temperature of a semiconductor. (6%, 11.55)
PS. 附 Table 10.3 , Table 7.2, 週期表
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