※ [本文转录自 NTU-Exam 看板] 作者: ckmungbean (绿豆) 看板: NTU-Exam 标题: [试题] 佘瑞琳老师普化甲94上期中考 时间: Wed Nov 9 14:02:10 2005 课程名称︰普通化学甲 课程性质︰必修 课程教师︰佘瑞琳 开课系所︰地质系 大气系 农化系 考试时间︰94.11.09 10:30~12:00 试题 : I. Multiple choice question(20%) 1. Which of the following conversions is correct? (a)12nm=1.2x10^-9m (b)2.3mg=2.3x10^-3g (c)3μL=3x10^-6L (d)0.800atm=60.8cmHg=608torr 2.Which of the following has three significant figures? (a)8.00g (b)8.0x10^3 (c)0.008g (d)(756x0.2687)/(0.12x298.5) 3.Which of the following molecules would you expect to have the largest b value for the van der Waals equation? (a)CH4 (b)H2 (c)C3H8 (d)He 4.Which of the following is strong electrolyte? (a)HCOOH (b)HNO3 (c)NaCH3COO (d)C6H12O6 5.Which of the following is conjugate acid-base pair? (a)H2CO3,CO3^2- (b)CH3NH2,CH3NH- (c)NH4+,NH3 (d)H30+,OH- 6.Which of the following solution has the greatest ionic strength(μ)? μ=1/2(c1z1^2+c2z2^2.....) (a)0.010M NaNO3 (b)0.0010M NaCl (c)0.010M AlCl3 (d)0.010M MgCl2 7.Based on the solubility rules,which of the following should be soluble in water? (a)(NH4)2CO3 (b)Ag2S (c)Hg2Cl2 (d)PbSO4 8.A reaction of 1L of A2 gas with 3L of B2 gas yield 2L of a gaseous product. All gas volumes are at same temperature and pressure. What is the formula of the gaseous product? (a)AB (b)AB2 (c)AB3 (d)none of the above 9.Which of the following pairs are isotopes? (a)O2 and O3 (b)CO and CO2 16 18 (c) O and O (d)H2O and H2O2 8 8 10.The oxidation state of iodine in IO3- is (a)-1 (b)-3 (c)0 (d)+5 II. Problems(80%) 1.Name or write the chemical formula of the following compounds: (20%) (a)NH4I (b)MgO (c)KHCO3 (d)Fe(NO3)3 (e)NaOCl (f)H2SO3 (g)SF6 (h)chromium(II) acetate (i)mercury(I) chloride (j)lithium nitride 2.How many protons,nertrons,and electrons are in each of the following atoms and ions? 59 3+ 79 2- (a) Co (b) Se (6%) 27 34 3.How would you separate the following ions in aqueous solution by selective precipitation? Ag+,Ba2+,Cr3+ (6%,4.26<=出处) 4.Consider 16.0 g of He and 16.0 g of CH4 gases are in separated containers with the same volume at the same temprature. (He=4.0,C=12.0,H=1.0) (4%,5.62) Choose the one(ones) that has higher (a)pressure (b)average kinetic energy (c)density (d)root mean square velocity 5.Arrange the following 0.10M solutions in order from most acidic to most basic.(4%) Ba(OH)2 KNO3 KF NH4Cl HNO3 6.Balance the following equations:(4%) (a)Eu + HF → EuF3 + H2 (b)Mn2+ + NaBiO3 → Bi3+ + MnO4- (in acidic solution) 7.Bornite(Cu3FeS3) is a copper ore used in the production of copper. When heated, the following reaction occurs: Cu3FeS3 + O2 → Cu + FeO + SO2 If 250g of bornite is reacted with excess O2 and the process has an 86.3% yield of copper,how much copper is produced? Balance the chemical equation first. (Cu=63.55 Fe=55.85 S=32.07) (6%,3.65) 8.Sodium hydroxide solution is usually standarized by titrating a pure sample of potassium hydrogen phthalate (KHP), an acid with one acidic hydrogen and a malor mass of 204.22g. It takes 32.58 mL of sodium hydroxide solution to titrate a 0.1082g sample of KHP. What is the molarity of the sodium hydroxide ? (4%) 9.A compound contains only nitrogen and hydrogen and is 87.4% nitrogen by mass. A gaseous sample of the compound has a density of 0.977g/L at 710 torr at 100度C.What is the molecular formula of the compound? (4%,5.45) 10.The effusion rate of an unknown gas is measured and found to be 25.44 mL/min Under identical experimental conditions the effusion rate of O2 is found to be 30.50 mL/min. Which of the following is the unknown gas:CH4,CO,NO,CO2,NO2 ? (4%,5.69) 11.A solution with a total volume of 250.0mL is prepared by diluting 20.0mL of galcial acetic acid with water.Calculate [H+] and the pH of this solution. Assume glacial acetic acid is prue liquid acetic with density of 1.05g/cm3. (Ka value for acetic acid is 1.8x10^-5)(4%) 12.Sodium azide(NaN3) is sometimes added to water to kill bacteria.Calculate the concentration of all species in a 0.010M solution of NaN3.The Ka value for hydrazoic acid(HN3) is 1.9x10^-3. (4%) 13.Arsenic acid(H3AsO4) is a triprotic acid with Ka1=5x10^-3,Ka2=8x10^-8,and Ka3=6x10^-10.Calculate [H+],[OH-],[H2AsO4^2-],[HAsO4^2-],and [AsO4^3-] in a 0.20M arsenic acid solution. (10%,7.53) -- 本草纲目：「绿豆甘寒无毒，主治消肿下气、压热解毒、治丹毒、烦热风疹、利尿止渴、 厚肠胃、作枕明目、治头风、头痛、补益元气、和调五脏、安精神、行十二经脉、润皮肤 、解一切草木金石砒霜毒」。 --

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