開課系所︰化學
考試時間︰2001.11.16
Total:200% 考3小時
A.Questions and definitions (140%)
1.Write down the full name of the following elements, compounds or apparatus
a.Cs, b.KMnO4, c.NaHCO3, d.Cr2O7 2-, e.Fe(NO3)3, f. KBrO3, g.GaN, H.H2SO3,
i.H3PO4, j.HNO2, k.量筒, l.有刻度之滴定管, m.拋棄式滴管, n.洗瓶, o.定容積三
角錐形燒瓶. (2%*15=30%)
2.Write down both symbol and full name of the a.Noble gases, b.Alkaline earth
metal families. (5%*2=10%)
3.Write down both symbol and full name of the transition metals from atomic
number 21 to 30. (20%)
4.For the van-der Waals equation of the real gas Pobs = nRT/(V-nb) - a(n/V)^2
a.For the following gases, which has the largest a value, and which has the
smallest value of b, explain
He,Ar,CH4,NH3 (3%)
b.At higher pressure such as >1000 atm pressure calculated from the van-der
Walls equation shows significant deviation from the observed one. Give a
reasonable explanation. (7%)
5.Balance the following reactions
a.Ag(s) + CN-(aq) + O2(g) → Ag(CN)2 -(aq) (in basic condition)
b.CH3OH(aq) + Cr2O7 2-(aq) → CH2O(aq) + Cr3+(aq) (in acidic condition)
(5%*2=10%)
6.The distribution of velocities of the particles in an ideal gas is described
by the Maxwell Boltzman distribution law
f(u) = 4π(m/(2π kB T))^(3/2) *(u^2)*(e^(-m u^2/2 kB T))
where u=velocity in m/s
m=mass of a gas particle in kg
kB=Boltzman's constant=1.38*10^-23
T=temperature in Kelvin
Derive the most probable velocity ump (need a detailed derivation) (10%)
7.For an ideal gas the mean free path λ can be expressed as
λ = 1/(√2(N/V)(π d^2))
where d is the diameter of the gas particle. Assumung the gas possesses a
root mean square velocity, calculate the collision frequency in a sample of
helium gas with a volume of 5.0L at 27度C and 3.0atm. The diameter of a
helium atom is 50pm., atomic mass=4 (15%)
8.A sample is a mixture of KCl and KBr. When 0.1024g of the sample is
dissolved in water and reacted with excess silver nitrate, 0.1889g of solid
is obtained. What is the composition by mass percent of the mixture?
(atomic mass:K:39, Cl:35, Br:80, Ag=108) (15%)
9.Vitamin A has a molar mass of 286.4g and has a general molecular formula of
CxHyE, where E is an unknown element. If Vitamin A is 83.86% C and 10.56% H
by mass, what is the molecular formula of Vitamin A? (10%)
10.The plot of PV/nRT versus P for gases N2, CH4, CO2 and H2 (200K) is shown
below. Assign each curve to the corresponding gas(Explanation required)
(10%)
to be continued
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作者: abacada (力量的極限) 看板: NTU-Exam
標題: [試題] 90年上 周必泰 普通化學甲上期中考part B
時間: Thu Jan 20 01:39:26 2005
B-4 單選題 (3%*20=60%)
1.The empirical formula of sugar is CH2O and its molar mass is 180.2g/mole. If
one teaspoom of sugar weighs 3.50grams, how many moles and molecules of
sugar are present?
a)0.117moles, 7.03×10^22molecules
b)0.0194moles, 3.24×10^26molecules
c)0.0194moles, 1.17×10^22molecules
d)0.0583moles, 3.51×10^22molecules
e)0.0295moles, 1.78×10^22molecules
2.A solution contains the ions Ag+, Pb2+, and Ni2+. Dilute solutions of NaCl,
Na2SO4,and Na2S are available to separate the positive ions from each other
. To separate the ions, in which order should the solytions be added?
a)Na2SO4, NaCl, Na2S
b)Na2SO4, Na2S, NaCl
c)Na2S, NaCl, Na2SO4
d)NaCl, Na2S, Na2SO4
e)NaCl, Na2SO4, Na2S
3.Which of the following statements is true for ideal gases?
a)The temperature of the gas sample is directly related to the average
velocity of the gas particles.
b)At STP, 1.0L of Ar(g) contains about twice the number of atoms as 1.0L of
Ne(g) because the molar mass of Ar is about twice that of Ne.
c)A gas exerts pressure because its molecules collide with the walls of the
container to release the energy.
d)The gas particles in a sample attract each other.
e)None of the above.
4.Which element does not belong to the family or classification indicated?
a)Br, halogen
b)He, noble gas
c)Fe, transition metal
d)K, alkali metal
e)Se, Lanthanide
5.Identify the strongest base.
a)CH3O-
b)CH3OH
c)CN-
d)H2O
e)NO3 -
6.Iron(II) sulfate reacts with potassium hydroxide in aqueous solution to form
a precipitate. What is the net ionic equation for this reaction?
a)Fe2+(aq) + SO4 2-(aq) → FeSO2(s)
b)2K+(aq) + SO4 2-(aq) → K2SO4(s)
c)2Fe3+(aq) + 3SO4 2-(aq) → Fe2(SO4)3(s)
d)Fe2+(aq) + 2OH-(aq) → Fe(OH)2(s)
e)K+(aq) + Fe2+(aq) → Fe3+(aq)
7.According to the equation 2KClO3(s) → 2KCl(s) + O2(g)
3.00-g sample of KClO3 decomposes and the oxygen at 24.0度C and 0.982atm is
collected. What volume of oxygen gas will be collected, assuming 100% yield
? Atomic mass, K:39, Cl:35
a)304mL
b)608mL
c)911mL
d)1820mL
e)none of these
8.An aqueous solution of barium nitrate reacts with an aqueous solution of
sodium sulfate. Identify the solid and indicate its coefficient in the
balanced equation.
a)NaNO3, 1
b)BaSO4, 1
c)NaNO3, 2
d)BaSO2, 2
e)None of these
9.The Claus reactions, shown below, are used to generate elemental sulfur from
hydrogen sulfide. (atomic mass:S=32)
H2S + O2 → SO2 + H2O (unbalanced)
SO2 + H2S → S + H2O (unbalanced)
How much sulfur(in grams) is produced from 48.0grams of O2?
a)16.0g, b)32.1g, c)48.1g, d)96.2g, e)none of those
10.Which of the following is true?
18 19
a) O and F have the same number of neutrons.
8 9
14 14
b) C and N are isotopes of each other because their mass numbers are the
6 7
same.
18 2- 20
c) O has different number of electrons as Ne.
8 10
d)The radius of a nucleus is ~ 10^-8 cm
e)None of the above
to be continued...
> -------------------------------------------------------------------------- <
作者: abacada (力量的極限) 看板: NTU-Exam
標題: [試題] 90年上 周必泰 普通化學甲上期中考part C
時間: Thu Jan 20 02:00:38 2005
11.Which reaction does not involve oxidation-reduction?
a)CH4 + 3O2 → 2H2O + CO2
b)Zn + 2HCl → ZnCl2 + H2
c)2Na + 2H2O → 2NaOH + H2
d)MnO2 + 4HCl → Cl2 + 2H2O + MnCl2
e)All are osidation-reduction reactions
12.The father of modern chemistry
a)Joseph Priestley
b)Antoine Lavoisier
c)John Dalton
d)Louis Gay-Lussac
e)Amedeo Avogadro
13.Which of the following is NOT the correct chemical formula for the compound
named?
a)hydrocyanic acid HCN
b)calcium sulfate CaSO4
c)beryllium oxide BeO
d)nickel(II) peroxide Ni2O
e)ammonium chromate (NH4)2CrO4
14,Which of the following statements is true?
a)The oxidation number for H in LiAlH4 is -1
b)The oxidation number of N in NO3 - is greater than that of S in SF6
c)The relative ability of atoms to attract shared electron is on the order
of F>O>N~Cl
d)(Effusion rate for gas 1/Effusion rate for gas 2)=(√M1/√M2)
e)None of the above
15.The kinetic molecular theory of gases does NOT assume that
a)gases are made up of tiny particles in chaotic motion
b)gas particles are very small compared to the average distance berween the
particles
c)gas particles collide with the walls of their container in elastic
collisions
d)The average velocity of gas particles is directly proportional to the
absolute temperature
e)The particles are assumed to exert no forces on each other
16.A sample of a xenon fluoride contains molecules of the form XeFn, where n
is some whole number, If 9.03×10^20 molecules of XeFn weigh 0.311g,
calculate n. (atomic mass,Xe=131, F=19)
a)1
b)2
c)4
d)none of these
17.Which of the experiments listed below did NOT provide the information
stated about the nature of the atom?
a)The Rutherford experiment proved the "plum-pudding" model of the atom was
essentially correct.
b)The Rutherford experiment proved the charge on the nucleus
c)Millikan's oil-drop experiment showed that the charge on any particle was
a simple multiple of the charge on the electron
d)The electron discharge tube proved that electrons have a negative charge.
18.Caffeine consists of carbon hydrogen, oxygen, and nitrogen. When 0.1920g
of caffeine is burned in an excess of oxygen, 0.3482g of cargon dioxide and
0.0891g water are formed. Caffeine is 28.84% nitrogen by mass. Its molar
mass is between 190 and 200 g/mol. What is formula for caffeine?
a)C4H5N2O
b)C3H2N2O2
c)C6H4N4O4
d)C8H10N4O2
e)none of these
19.Which of the following statements about atomic structure is FALSE?
a)The electrons occupy a very large volume compared to the nucleus
b)Almost all of the mass of the atom is concentrated in the nucleus
c)The protons and neutrons in the nucleus are very tightly packed
d)The number of protons and neutrons is always the same in a neutral atom.
20.Which of the following statements is true?
I.The number of protons is the same for all neutral atoms of an element
II.The number of electrons is the same for all neutral atoms of an element
III.The number of neutrons is the same for all neutral atoms of an element
a)I,II,III, b)I,II, c)II,III, d)I,III
Ans:c a a或e e a dabda ebdad caddb