課程名稱︰普通化學丙
課程性質︰系定必修
課程教師︰楊美惠
開課系所︰獸醫 植微
考試時間︰95.1.13
試題 :
一.Multuple Choice Questions (62%)
1.Which statement is incorrect?
(A)Decreasing the external pressure decreases the boiling point of a liquid.
(B)The normal bouling point is the temperature at which the vapor pressure
equals 1 atm
(C)The density of a liquid decreases with increasing temperature, while that
of vapor increases.
(D)Even above the critical temperature, increasing the pressure on a gas
should make it liquefy.
(E)A supercritical fluid exists at temperatures above Tc and pressures above
Pc.
2.Which of the following liquids has the greatest viscocity?
(A)hexane (B)CH3OCH2CH2CH3 (C)CH3CH2OCH2CH3 (D)CH3CH2OH (E)HOCH2CH2OH
3.A metal that crystallizes in the body-centered cubic (bcc) structure has a
crystal coordination number of
(A)4 (B)6 (C)8 (D)10 (E)12
4.Which of the following is true of a unit cell of an ionic crystal?
(A)It is the same as the formula unit.
(B)It is any portion of the ionic crystal that has a cubic shape.
(C)It shares a portion of its ions with other unit cells.
(D)It always contains the same number of cations and anions.
5.
︿
Reaction Rate│-------------╭───────
│ ╱
│ ╱
│ ／
│ ／
│ ／
│ ／
│／
└───────────────>
Substrate Concentration
Consider the plot shown above of reaction rate versus substrate concentration
for an enzyme. Why does the curve become flat with large substrate
concentration?
(A)Large substrate concentrations saturate all of the active sites on the
enzyme molecules.
(B)Large amounts of substrate change the acidity of the reaction medium thus
slowing the activity of the enzyme.
(C)Large substrate concontrations reduce the number of enzyme-substrate (ES)
complexes being formed.
(D)LeChatlier's Principle doesn't apply to enzyme kinetics.
(E)Additions of large amounts of substrate change the effective temperature and
thus the rate of the reaction changes.
6.In the reaction 2A + B -> 2C + D , -△[A]/△t is found to be 5.0 M．min^-1.
What is the rate of reaction of B ?
(A)2.5 (B)5.0 (C)10 (D)75 (E)Additional information is required.
7.Which statement is incorrect?
(A)The half-lifeof a zero order reaction is directly proportional to the
initial concentration(i.e, the greater the concentration the longer the
half-life)
(B)The half-life of a first order reaction is directly proportional to the
initial concentration.
(C)The half-life of a second order reaction is inversely proportional to the
initial concentration.
(D)The half-life of a first order reaction is independent of the initial
concentration.
(E)The shorter the half-life, the faster is the reaction.
8.According to the collision theory of kinetics, which statement best describes
the rate of a chemical reaction?
(A)All collisions result in a chemical reaction.
(B)All collisions between molecules with at least a minimum kinetic energy
result in reaction.
(C)All collisions between molecules with at least a minimum kinetic energy and
the proper orientation result in reaction.
(D)The greater the difference in energy between the reactants and products, the
faster is the reaction.
(E)The greater the difference in energy between the reactaants and the
transition state, the faster is the reaction.
9.Consider the following 2-step mechanism. Which of the species in the
mechanism is the intermediate?
H2O2 + I¯ ==> H2O + OI¯ fast step
H2O2 + OI¯==> H2O + O2 + I¯ slow step
───────────────────────
2H2O2 ==> 2H2O+ O2 net reaction
(A)H2O2 (B)H2O (C)I¯ (D)OI¯ (E)O2
10.The value of Kc is changed when
(A)the concentration of reactants are changed.
(B)the volume of the system is changed.
(C)the pressure of the system is changed.
(D)the temperature of the system is changed.
(E)a catalyst is added.
11.For the gaseous system, 2H2S + 3O2 <==> 2H2O + SO2, how is Kp related to Kc
at a given temperature?
(A)less than (B)equal to (C)greater than (D)unrelated to
12.Which change will increase the quantity of product in the following
reaction?
(A)an increase in temperature
(B)a decrease in volume of container
(C)a decrease in pressure
(D)adding a catalyst
(E)increasing P by adding some argon
13.Which of the following is not a spontaneous process at room temperature?
(A)the reaction of N2(g) and O2(g) to form NO(g) (components of air)
(B)H2O(s) ==> H2O(l) at 10。C.
(C)CH4(g) + 2O2(g) ==> CO2(g) + 2H2O(l) (combustion of natural gas)
(D)4Fe(s) + 3O2(g) ==> 2Fe2O3(s) (formation of rust)
(E)CaO(s) + CO2(g) ==> CaCO3(s), Kp = 7.1×10^22
14.Which of the following statements correctly identifies the Second Law of
Thermodynamics?
(A)All spontaneous processes increase the entropy of the universe.
(B)The enthalpy of a pure substance at 0K is zero.
(C)The total entropy of the universe is the sum of the entropy of the system
and the surroundings.
(D)The free energy of a reaction at equilibrium is zero.
(E)The reverse of a spontaneous reaction is a nonspontaneous process.
15.Which of the following is most dependent on temperature?
(A)△H。 (B)△S。 (C)△G。 (D)None of the above depends on temperature.
16.Predict the signs of △S。,△H。 and △G。 for the following process at
25。C
2NH3(g) ==> N2(g) + 3H2(g)
△S。 △H。 △G。
(A) + + -
(B) - + -
(C) + - +
(D) - - -
(E) + + +
17. Table 18.1 Selected Standard Electrode Potential at 25。C
Reaction E。,V
Mg2+(aq) + 2e¯ ==> Mg(s) -2.356
Fe2+(aq) + 2e¯ ==> Fe(s) -0.440
Pb2+(aq) + 2e¯ ==> Pb(s) -0.125
2H+(aq) + 2e¯ ==> H2(g) 0.0
Cu2+(aq) + 2e¯ ==> Cu(s) +0.337
I2(s) + 2e¯ ==> 2I¯(s) +0.535
Fe3+(aq) + e¯ ==> Fe2+(aq) +0.771
Ag+(aq) + e¯ ==> Ag(s) +0.800
O2(g) + 4H+(aq) + 2e¯ ==> 2H2O +1.229
Cl2(g) + 2e¯ ==> 2Cl¯(aq) +1.358
F2(g) + 2e¯ ==> 2F¯(aq) +2.866
(Refer to Table 18.1)Which is the best oxidizing agent?
(A)F¯ (B)Mg2+ (C)Fe3+ (D)Cu2+ (E)Cl2
18.Consuder a cell made up of two half cells consisting of the same metal in
solutions of the metal ion of different concentrations. Which statement is
incorrect?
(A)The E。cell is zero.
(B)The cell containing more concentrated electrolyte is the anode.
(C)The spontaneous reaction will proceed until the concentrations become equal.
(D)Reduction occurs in the more concentrated solution.
(E)The greater the ratio in concentrations between the two cells, the greater
is the initial voltage.
19.Half-reactions can be added together to obtain the complete balanced redox
reaction if
(A)the number of atoms balances.
(B)the number of elections in the oxidation half-reaction equals the number of
electrons in the reduction half-reaction.
(C)one of the reactions is reduction and the other is oxidation.
(D)the charges on the ions in each half-reaction are identical.
(E)the individual half-reactions are balanced.
20.Which of these metals is not a transition element?
(A)Zr (B)Mo (C)Os (D)Pb (E)Hg
21.The fact that the atomic size doesn't increase between the 5th and 6th
period members of a group of transition metals is an example of
(A)periodicity (B)group classification (C)electrical conductivity
(D)lanthanide contraction (E)superconductivity.
22.What is the coordination number of copper in the [Cu(en)2(H2O)2]2+ complex?
(A)0 (B)2 (C)4 (D)6 (E)none of these
23.Name the following coordination ccompound:Na3[Fe(H2O)6]
(A)trisodium hexaaquairon(II) (B)sodium hexaaquairon(III)
(C)trisodium hexahydroiron(III) (D)sodium iron(III) hydrate
(E)trisodium iron(II) hexahydrate
24.Name the following compound:[Cr(NH3)2(en)Cl2]Cl
(A)chromium(III) diammineethylenediamine trichloride
(B)diammineethylenediaminodichlorochromium(III) chloride
(C)diamminedichloroethylenediaminechromium(III) chloride
(D)diammineethylenediaminetrichlorochromium(III)
(E)trichlorodiamminoethylenediaminechromate
25.Which statement is incorrect?
(A)Crystal field theory views the bond between the contral atom or ion and the
ligands as largely electrostatic.
(B)The spectrochemical series orders the ligands according to their abilities
to spilt the d-orbital energy level.
(C)Paramagnetic species contain unpaired electrons.
(D)A "high spin" complex results from a strong field ligand.
(E)The splitting of the energies of the d orbitals results from different
interactions between the d orbitals and the ligands.
26.Reasoning from crystal field theorry,which correlatin of ligand and solution
color is most reasonable?
(A)weak field-yellow (B)strong field-yellow (C)weak field-red
(D)strong field-violet (E)strong field-blue
27.Which of the following coordination complexes is most stable?
(A)[Ni(NH3)6]2+ (B)NiCl2 (C)[Ni(H2O)6]2+ (D)[NiEDTA]2¯ (E)[Ni(CO)6]2+
28.Name the functional group in the following molecule(in the order,circle,
triangle,and rectangle)
O H H H H
∥ ∣ ∣ ∣ ∣
HO—C—C—C—C—O—C—H
︱ ︱ ︱ ︱
NH2 H H H
(A)alcohol, amine ,ketone (B)carboxylic acid, amine, ether
(C)carboxylic acid, amine, ester (D)ester, nitro, rther
(E)carboxylate, imine, alcohol
29.Which type of spectroscopy would be most useful in detecting the presence of
a C═O functional group in a molecule?
(A)IR (B)UV-Vis (C)NMR (D)MS (E)X-ray
30.Which of the following techniques could be used to distinguish between
1,3-pentaduene and pentane?
(A)NMR spectroscopy (B)IR spectroscopy (C)UV spectroscopy (D)both A and B
(E)all of the above
31.Which of the following spectroscopic methods would be able to easily
distinguish between the following molecules?
H OH H H H H
｜ ｜ ｜ ｜ ｜ ｜
H—C—C—C—H H—C—C—C—OH
｜ ｜ ｜ ｜ ｜ ｜
H H H H H H
(A)Infrared spectroscopy (B)Ultra-violet spectroscopy
(C)Nuclear Magnetic Resonance Spectroscopy (D)all of the above
(E)The two molecules are indistinguishable.
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