课程名称︰普通化学甲 课程性质︰必带 课程教师︰佘瑞琳 开课学院：工学院 开课系所︰化工系 考试日期（年月日）︰2010/10/27 考试时限（分钟）：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 : 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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