[試題] 99上 佘瑞琳 普通化學甲 期中考
課程名稱︰普通化學甲
課程性質︰必帶
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）︰2010/10/27
考試時限（分鐘）：110分鐘
是否需發放獎勵金：是
（如未明確表示，則不予發放）
試題 :
Atomic mass (in amu): He=4.00, N=14.01, O=16.00, K=39.10, C=12.01, Cl=35.45,
Br=79.90, Si=28.09, H=1.008, Na=22.99, R=0.082L-atm/mol-K, 1L-atm=101.32J
I.Multiple choice(There maybe more than one correct answers. 2 points each,40%)
1.Which of the conversion is correct?
(a)15.8mL=0.158L (b)33nm=3.3*10^9m (c)2μg=2*10^-6g (d)298K=77℉
2.Which of thr following calculations show two significant figures in the answ
er?
(a)19.452+3.2 (b)1.022*0.0011 (c)(41.02+0.02+0.003+63.00)/45.2340
(d)(37.1+7.1+8.32)/(10.3-8.2)
3.The following measurements were made by a group of students using the same
balance and a 25.00 gram weight.
Trial Mass(g)
---------------------------------------------------
1 23.96
2 24.01
3 23.98
4 23.97
The data would be considered:
(a)accurate
(b)precise
(c)neither precise nor accurate
(d)evidence of a systematic error
4.Solubility rules predict precipitate formation for mixing 0.1M aqueous
solutions of
(a)NiBr2 and NH4NO3 (b)NaI and Pb(NO3)2 (c)H2SO4 and BaCl2 (d)KOH and Cu(NO3)2
228 2+
5.For the 86 Ra ,which of the following statement is correct?
(a)the atomic number is 86 (b)the number of protons is 86
(c)the number of electrons is 86 (d)the number of neutrons is 86
6.Choose the one that has the largest oxidation state of the underlined
elements. 2-
(a)CH4 (b)SF4 (c)Na2O2 (d)FeO4
^ ^ ^ ^^
7.Which of the following pairs are allotropes?
1 3 40 40
(a) H, H (b)graphite,C60 (c)18Ar,19K (d)O2,O3
8.The addition of 2.00g He(g) to a vessel of 11.2L fixed volume already
containing O2(g) at 0℃ and 760mmHg. Assume ideal gas behavior.
(a)There are 0.500 mol of helium gas.
(b)The mole fraction of helium gas is 0.500.
(c)The partial pressure of helium gas is 380mmHg.
(d)The total pressure of the gas is 760mmHg.
9.If a liter of N2 is compared to a liter of H2, both at 25℃ and one
atmosphere pressure, then:
(a)the N2 and H2 molecules have the same average speed
(b)the N2 and H2 gases have same number of gas molecules
(c)the average kinetic energy of the N2 molecules is same as that of the H2
molecules
(d)the N2 and H2 gases have same mass
10.At 27℃ and 750 torr, both a 16g sample of methane gas(CH4) and a 16g
sample of oxygen gas(O2) will have the same:
(a)average effusion rates (b)average molecular kinetic energies
(c)number of gaseous particles (d)total gaseous volumes
11.Under conditions for which chlorine gas has an effusion rate of 2.4*10^-6
mol/s, what would be the effusion rate for bromine gas, in mol/s?
(a)1.1*10^-6mol/s (b)1.6*10^-6mol/s (c)2.3*10^-6mol/s (d)3.6*10^-6mol/s
12.In which of the following cases is the gas most likely to behave as an
ideal gas?
(a)H2O(g),375K,750 torr (b)He(g),37.5K,7500 torr
(c)CH4(g),37.5℃,7.5 atm (d)Ne(g),375℃,0.75 atm
13.The standard enthalpy of formation of NH3(g) is -46.11kJ/mol. What is ΔHº
for the following reaction in kJ? 2NH3(g)→N2(g)+3H2(g)
(a)-92.22 (b)+46.11 (c)+92.22 (d)+2126
14.Halothane is one of the modern anesthetics which is nonflammable and
relatively safe for patients. What is the molar mass of halothane if 456
milligrams is 52.8 milliliters at 22℃ and 805 torr?
(a)1.06*10^3g/mol (b)209g/mol (c)197g/mol (d)221g/mol
15.A system absorbs 623J of heat while doing 457J of work. What is the value
of ΔU?
(a)+1080J (b)-166J (c)+166J (d)-1080J
16.2NOCl(g)→2NO(g)+Cl2(g) ΔHº=+75.56kJ
2NO(g)+O2(g)→2NO2(g) ΔHº=-113.05kJ
2NO2(g)→N2O4(g) ΔHº=-58.03kJ
Compute ΔHº of N2O4(g)+Cl2(g)→2NOCl(g)+O2(g) in kJ.
(a)+246.65 (b)-95.52 (c)-246.65 (d)+95.52
17.What is the reaction for the standard enthalpy of formation for CdSO4(s)?
(Cd(s) is the stable form of cadmium.)
(a) Cd(NO3)2(aq)+H2SO4(aq)→2HNO3(aq)+CdSO4(s)
2+ 2-
(b) Cd (aq)+2SO4 (aq)→CdSO4(s)
(c)Cd(s)+1/8S8(s)+2O2(g)→CdSO4(s)
(d)CdO(s)+SO3(l)→CdSO4(s)
18.When 2.00 mol of CO(g) reacts completely with 1.00 mol of O2(g) to form
2.00 mol of CO2(g) at 298K and constant pressure of 1.00 atm, 566.0kJ of
energy is released as heat.
(a)qp=-566.0kJ (b)ΔH=-566.0kJ (c)w=0kJ (d)ΔU=-566.0kJ
19.In an adiabatic process, a system is thermally insulated－－there is no
exchange of heat between system and surroundings. For the adiabatic expansion
of an ideal gas
(a)w=0 (b)q=0 (c)ΔU=0 (d)ΔP=0
20.Which of the followings is greenhouse gas?
(a)CH4(g) (b)H2O(g) (c)CO2(g) (d)O2(g)
II.Problems(60%)
1.Give the systematic name or the chemical formula for the following compounds.
(a)AgNO3 (b)CoSO4 (c)Ca(HCO3)2 (d)N2O4 (e)HClO (f)SF6
(g)CH3CH2CH=CH2 (h)CH3OH (i)magnesium nitride (j)2-chloropentanoic acid
2.Potassium-40 is one of the few naturally occurring radioactive isotopes of
elements of low atomic number. Its percent naturally abundance among K isotopes
is 0.012%. How many K-40 atoms are present in 225mL of whole milk containing
1.65mg K/mL?(4%,p.57)
3.Indigo, the dye for blue jeans, has a percent composition by mass, of
73.27% C, 3.84% H, 10.98% N, and the remainder is oxygen. The molecular mass
of indigo is 262.3u. What is the molecular formula of indigo?(4%,3.37)
4.High-purity silicon is obtained using a three-step process. The first step
involves heating solid silicon dioxide, SiO2, with solid carbon to give solid
silicon and monoxide gas. In the second step, solid silicon is converted into
liquid silicon tetrachloride, SiCl4, by treating it with chlorine gas. In the
last step, SiCl4 is treated with hydrogen gas to give ultrapure solid silicon
and hydrogen chloride gas.
(a)Write balanced chemical equations for the steps involved in this three
three-step process.
(b)Calculate the masses of carbon, chlorine, and hydrogen required per
kilogram of silicon.(6%,4.89)
5.We use sodium oxalate to standardize KMnO4(aq). If 0.2482g Na2C2O4 is
dissolved in water and titrated with 23.68mL KMnO4, what is the molarity of the
KMnO4(aq)? Balance the following redox equation first.(4%,p.181)
- 2- + 2+
MnO4 (aq)+C2O4 (aq)+H (aq)→Mn (aq)+H2O(l)+CO2(g)
6.A stock bottle of nitric acid indicated that the solution is 67.0% HNO3 by
mass and has a density of 1.40g/mL. Calculate the mole fraction, molarity,
and molality of HNO3 the solution.(6%)
7.The heat of combustion of 2-propanol at 298.15K, determined in a bomb
calorimeter, is -33.41kJ/g. For the combustion of one mole of 2-proparol,
determine (a)qv (b)qp (c)ΔU ,and(d)ΔH(8%,7.65)
8.The heat of neutralization of HCl(aq) by NaOH(aq) is -55.84kJ/mol H2O
produced. If 50.00mL of 1.05M NaOH is added to 25.00mL of 1.86M HCl, which both
solutions originally at 24.72℃, what will be the final solution temperature?
(Assume that no heat is lost to surrounding and that the solution produced in
the neutralization reaction has a density of 1.02g/mL and a specific heat of
3.98J/g-℃.(4%,7.26)
9.Given that ΔHºf[BaSO4(s)]=-1473kJ/mol, what is the standard enthalpy
changes for the precipitation of BaSO4?(4%,p.274)
Some Standard Molar Enthalpies of Formation,ΔHºf of Ions in Aqueous Solution
at 298.15K
------------------------------------------------------------------------------
Ion kJ/mol Ion kJ/mol
+ -
H 0 OH -230.0
+ -
Li -278.5 Cl -167.2
+ -
Na -240.1 Br -121.6
+ -
K -252.4 I -55.19
+ -
NH4 -132.5 NO3 -205.0
+ 2-
Ag 105.6 CO3 -677.1
+ 2-
Mg -466.9 S 33.05
2+ 2-
Ca -542.8 SO4 -909.3
2+ 2-
Ba -537.6 S2O3 -648.5
2+ 3-
Cu 64.77 PO4 -1277
3+
Al -531
--
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◆ From: 140.112.7.59
推
11/09 21:09, , 1F
11/09 21:09, 1F
嗯我還是把它補齊好了~
※ 編輯: oliver1089 來自: 59.112.164.201 (11/10 20:27)
推
11/11 01:53, , 2F
11/11 01:53, 2F