课程名称︰普通化学丙
课程性质︰系定必修
课程教师︰陈振中
开课学院：
开课系所︰生物环境系统工程学系
考试日期（年月日）︰2008/6/19
考试时限（分钟）：10:20~12:10 (110分钟)
是否需发放奖励金：是
（如未明确表示，则不予发放）
试题 :
General Chemistry
Final Examination
______________________________________________________________________________
You may or may not find the following equation and physical constants useful.
o o
ΔG =-nFEcell
F=96485.3 C/mol
Gas constant = 8.314 J(K^-1)(mol^-1)
______________________________________________________________________________
Section A (40 point):
1.Draw Lewis structures for the following . Show all resonance structures ,
where applicable . Carbon is the central atom in OCN¯and SCN¯.
(a) NO2¯,NO3¯,N2O4(N2OA exist as O2N-NO2.)
(b) OCN¯,SCN¯,N3¯
2.Given the first ionizationenegies shown in the following diagram:
附图是三周期元素的游离能原子序图
(a) Explain the general trend of the data across a period .
(b) Explain why the first ionization energy from Be to B .
Section B (60 point):
1. For a solution of 34wt% HNO3，calculate the molarity of the acid if the
density of the solution is identical to pure water .
(a) 8M
(b) 6.1M
(c) 5.4M
(d) 7.1M
2.Which of the following compound does not have sp2 hydrid orbitals ?
(a) diamond
(b) graphite
(c) benzene
(d) C2H4
3.Consider the most stable Lewis structure of SO4^2-，what is the formal
charge of S ?
(a) -2
(b) -1
(c) 0
(d) +1
4.For a [H+] concentration of 0.02040M，the pH value should read
(a) 1.69036
(b) 1.6904
(c) 1.690
(d) 1.69
5.If we use a pH metwe to measure the pH of the following solutions，
solution A : 0.001M KCl(aq)，
solution B : 0.01M NaOH，
solution C : 0.01M HCl + 1M KCl，
what should be the expected reading ?
(a) solution A : pH=7 ; solution B : pH=12 ； solution C : pH=2
(b) solution A : pH=7 ; solution B : pH>12 ； solution C : pH=2
(c) solution A : pH=7 ; solution B : pH<12 ； solution C : pH>2
(d) solution A : pH=7 ; solution B : pH>12 ； solution C : pH<2
6.Consider a fuel cell making use of the methanol combustion:
CH3OH(g) + 3/2 O2(g)→CO2(g) + 2 H2O(l)
o
ΔG f(CO2)=-394Kj/mol
o
ΔG f(H2O)=-237Kj/mol
o
ΔG f(CH3OH)=-163Kj/mol
Which of the following statement is INCORRECT ?
(a) Water is consumed at the cathod and is produced at the anode .
(b) The emf of the fuel cell is 0.122V .
(c) There are 6 electrons transferred for the reaction of each methanol
molecule
(d) A fuel cell always requires a suitable membrane to separate the chemical
species reacting at the anode and cathode .
7.What is the oxidation number of V in V2O5 ?
(a) +5
(b) +6
(c) +7
(d) -7
8.Consider the following Fisher projection
CH3
｜
H─┼─Br
｜
H─┼─Cl
｜
CH3
What is the CIP convention of two chiral carbons ?
(a) The carbon bonded to Br and Cl are S and R，respectively
(b) The carbon bonded to Br and Cl are R and S，respectively
(c) Both carbon are S
(d) Both carbon are R
9.Calculate the molarity of pure water.
(a) 10M
(b) 1.0M
(c) 55.6M
(d) 5.5M
10.What is the shape of the molecule ClF4¯?
(a) Tetrahedral
(b) Octahedral
(c) Square planar
(d) Seesaw
11.Which of the following statement is CORRECT ?
(a) The physical meaning of an orbital correspond to the electron density
(b) For orbitals with the same l quantum number(same shap)，the large the
orbital，the higher the energe
(c) Experimentally we can measure the shape of an orbital
(d) The 2s and 2p orbitals are degenerate for a carbon atom
12.Referring to the following wavefunction calculated for a particle in a
one-dimensional box.
The probability that a particle appears in the middle of the box is
(a) 0.5
(b) 1.0
(c) 0.0
(d) 0.25
13.Consider the following moleculs，
1.H2CH2 2.H2CCH2 3.H2CCCH2 4.H2CCCCH2
which of the them will have all the hydrogen atoms lying on the same plane
(a) 2 only
(b) 2 and 4
(c) 2 and 3
(d) 2 and 3 and 4
14.What is the hybridization scheme of the carbon atom in CO2 molecule ?
(a) sp
(b) sp2
(c) sp3
(d) sp4
15.Arsenic and many of its compounds are especially potent poisons . The World
Health Organization's standard of arsenic level in drinking water is 10ppb
. That is this level expressed in mg per liter ?
(a) 10mg/L
(b) 0.01mg/L
(c) 0.0001mg/L
(d) 0.001mg/L
16.Which of the following species have the lowest LUMO ?
(a) H2O
(b) H+
(c) CH3COO¯
(d) CH4
17.Which of the following is the LUMO for 1,3-butadiene(H2C=CH-CH=CH2)
18.The molecule Be2 is found to be a stable molecule，whereas He2 is unstable.
The major reason is because
(a) Be2 has more empty molecular orbitals than He2
(b) Be2 has less empty molecular orbitals than He2
(c) The stabilization due to the s-p mixing in Be2
(d) The destabilization due to the s-p mixing in He2
19.Consider the following MO diagram of N2^2+(氮原子失去两个电子) molecule :
Which of the following statement is CORRECT ?
(a) The HOMO is of σ bond type/the molecule is diamagnetic/bond order is 3
(b) The HOMO is of π bond type/the molecule is paramagnetic/bond order is 3
(c) The HOMO is of σ* bond type/the molecule is paramagnetic/bond order
is 2
(d) The HOMO is of π bond type/the molecule is diamagnetic/bond order is 2
20.Which of the following is non-colligative property ?
(a) Vapor pressure
(b) Osmotic pressure
(c) Density
(d) Boiling point elevation
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