單選題(3%*20=60%)
1.Li(s) → Li(g) heat of sublimation of Li(s)=166 KJ/mol
HCl(g) → H(g) + Cl(g) bond energy of HCl=427 KJ/mol
Li(g) → Li(g)+ + e- ionization energy of Li(g)=520 KJ/mol
Cl(g) + e- → Cl-(g) electron affinity of Cl=-349 KJ/mol
Li(g)+ + Cl-(g) → LiCl(s) lattice energy of LiCl(s)=-829 KJ/mol
H2(g) → 2H(g) bond energy of H2(g)=432 KJ/mol
Calculate the net change in energy for the reaction:
2Li(g) + 2HCl(g) → 2LiCl(s) + H2(g)
a)363 KJ
b)-562 KJ
c)-179 KJ
d)-73 KJ
e)non of above
2.Which of the following is the correct order of molecules from most to least
polar?
a)CH4 > CF2Cl2 > CF2H2 > CCl4 > CCl2H2
b)CH4 > CF2H2 > CF2Cl2 > CCl4 > CCl2H2
c)CF2Cl2 > CF2H2 > CCl2H2 > CH4 = CCl4
d)CF2H2 > CCl2H2 > CF2Cl2 > CH4 = CCl4
e)CF2Cl2 > CF2H2 > CCl4 > CCl2H2 > CH4
3.Which of the following is NOT a valid resonance structure for N3-?
.. .. .. -
a) [ Ｎ＝Ｎ─Ｎ: ]
'' ''
.. -
b) [ Ｎ≡Ｎ─Ｎ: ]
'' ''
.. -
c) [:Ｎ—Ｎ≡Ｎ: ]
''
.. .. -
d) [ Ｎ＝Ｎ＝Ｎ ]
'' ''
4.Which molecule has the smallest bond angle?
a)O3
b)OF2
c)HCN
d)SSe3
5.Which element does E represent in the formula below?
:Ｏ: a)Si
.. ∥ - b)S
[:Ｏ－Ｅ－Ｈ] c)As
'' ∣ d)Xe
:Ｏ: e)B
''
6.Consider the compound crotonaldehyde
H H H H
| | | |
H─C1─C2─C3─C4─O
|
H
How many nonbonding electrons appear in the Lewis structure of this molecule
?
a)2
b)4
c)6
d)8
e)10
7.In the following Lewis structure
Ｈ Ｈ Ｈ
｜ .. ｜ │ ..
Ｈ─Ｃ─Ｏ─Ｃ─Ｃ≡Ｃ─Ｃ＝Ｎ─Ｈ
│ '' │1 2 3 4
Ｈ Ｈ
What is the hybridization of the oxygen atom and carbon atoms 1,2,and 4,
respectively?
O C-1 C-2 C-4
a)sp3 sp3 sp sp2
b)sp sp3 sp sp
c)sp sp2 sp sp2
d)sp2 sp3 sp2 sp3
e)sp sp3 sp2 sp
8.Which of the following has the largest bond energy?
a)O2
b)O2 -
c)O2 2-
d)O2 +
e)O2 2+
9.Order the molecules C2, B2, H2 and N2 from the shortest to largest bond
length
a)H2, N2, C2, B2
b)N2, C2, B2, H2
c)C2, N2, H2, B2
d)C2, B2, H2, N2
10.Which statement is NOT true?
a)Electrons are never found in an antibonding molecular orbital
b)All antibonding molecular orbitals are higher in energy than the atomic
orbitals of which they are composed
c)Antibonding molecular orbitals have electron density mainly outside the
space between the two nuclei
11.Which of the following statements about the CO3 2- ion is FALSE?
a)The orbitals on the carbon atom are sp2 hybridized
b)The ion is expected to be diamagnetic
c)One C-O bond is shorter than the other
d)The ion has a total of 24 electrons
12.A wave function is expressed as
Ψ = (1/81√(3π))((Z/a0)^(3/2))(27-18σ+2σ^2)e^(-σ/3)
specify the corresponding orbital?
a)1s
b)2s
c)2pz
d)2px
e)3dz^2
f)3s
13.The hybridization of the central atom in SeF4 is
a)sp
b)sp2
c)sp3
d)dsp3
e)d2sp3
14.Use the energy-level diagram for the hydrogen atom. Select the TRUE
statement.
a)A transition from n=5 to n=3 involves greater energy than one from n=4 to
n=2
b)The transition from n=4 to n=2 emits radiation of longer wavelength than
the transition from n=5 to n=1
c)All transitions from states for which n>1 to the n=1 state involve the
absorption of energy by the atom
d)A transition from n=2 to n=∞ corresponds to the ionization energy of the
H atom
15.Which of the following is a reasonable criticism of the Bohr model of the
atom?
a)It makes no attempt to explain why the negative electron does not
eventually fall into the positive nucleus
b)It does not adequately predict the line spectrum of hydrogen
c)It does not adequately predict the ionization energy of the valence
electron(s) for elements other than hydrogen
d)It does not adequately predict the ionization energy of the first energy
level electrons for one-electron species for elements other than hydrogen
e)It shows the electrons exist outside the nucleus
16.Which is the electron configuration of the element with atomic number 109?
a)[Rn]7s2 5f14 6d7
b)[Rn]7s2 6f14 6d1 7p6
c)[Rn]8s2 7f14 6d7
d)[Xe]7s2 5f14 6d7
e)[Re]7s2 6d7
17.An element with the electron configuration [Kr]4d10 5s2 5p2. The formula
for the fluoride of E is most likely
a)EF14
b)EF4
c)EF
d)EF6
e)EF8
18.Choose the pair of sequences that arranges, respectively, the atomic radius
and ionization energy from the smallest to largest?
a)S, O, F and F, O, S
b)F, S, O and O, S, F
c)S, F, O and S, F, O
d)F, O, S and S, O, F
19.What is the probability of finding a particle in a one-dimensional box in
energy level n=4 between x=L/4 and x=L/2? (L is the length of the box)
a)12.5%
b)25%
c)33%
d)37.5%
e)50%
20.A first-order reaction is 35% complete after 55 minutes. What is the
lifetime of this reaction?
a)530 min
b)0.028 min
c)88 min
d)128 min
e)176 min
f)none of these
解答:edabb baeaa cfdbc abdbd
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