※ [本文轉錄自 NTU-Exam 看板] 作者: bpqd ( ) 站內: NTU-Exam 標題: [試題] 曾文碧 普化甲 期中考 93年 時間: Mon Nov 15 13:18:02 2004 課程名稱︰普通化學甲 課程性質︰ 課程教師︰曾文碧 開課系所︰大氣 考試時間︰2004/11/10 試題 : PV=nRT,R=0.08206L˙atm˙K^-1˙mol^-1=8.3144J˙K^-1˙mol^-1, O。C=273K Atomic mass:H=1.008, He=4.00, C=12.01, N=14.01, O=16.00 Na=22.99 ZA=A˙(N/V)˙[RT/(2πM)]^1/2 (1) Perform the following calculations, and give answers with the proper number of significant figures. (a)65+31.3-9.2 (b)(1.5× 8.56)/(0.08206× 273) (c)4.1×6.022×10^23 (3%) (2)Write formula for each of the following compounds, ions, or elements (10%) (a)sulfur trioxide (b)ammonium sulfate (c)permanganate ion (d)potassium dihydrogen phosphate (e)manganese(Ⅱ) hydroxide (f)chromium(Ⅲ) carbonate (g)silicon tetrachloride (h)nitric acid (i)ozone (j)neodymium ion(Ⅲ) (3)Name each of the following compounds: (20%) (a)H2S (b)(NH4)2SO4 (c)O2F2 (d)H2SO4 (e)K2Cr2O7 (f)MgO (g)NO (h)NH3 (i)NaHCO3 (j)CO2 (k)UF6 (l)NaOCl (m)BaCrO4 (n)HCN (o) Ca(OH)2 (p)Mg3(PO4)2 (q)CuI (r)KClO3 (s)Ga2O3 (t)element-108 (4)What is a mass spectrometer? What are the major components of a mass spectrometer? (5%) (5)Potassium chromate is produced by the reaction of solid chromite ore (FeCr2O4) with solid potassium caebonate and gaseous oxygen at high temperatures. The other products of the reaction ate solid iron(Ⅲ) oxide and gaseous carbon dioxide. In a particular experiment 169 kg of chromite ore, 298 kg of potassium carbonate, and 75.0kg of oxygen were sealed in a reaction vessel and reacted at a high temperature. The amount of potassium carbonate obtained was 194kg. Calculate the percntage yield of potassium chromate (6%) (6)What acid and what strong base would react in aqueous solution to produce the following salts in the molecular equation? Write the balanced molecular equation for each reaction (a)potassium perchlorate (b)cesium nitrate (c)calcium iodide (6%) (7)Assign oxidation states to all atoms in each of the following compounds (a)XeOF4 (b)SF4 (c)CO (d)Fe3O4 (e)Li3N (f)NO (g)N2 (7%) (8) A student added 50.0mL of an NaOH solution to 100.0mL of 0.400 M HCL. The solution was then treated with an excess of aqueous chromium(Ⅲ) nitrate, resulting in formation of 2.06g of precipitate. Determine the concentration of the Na OH solution (6%) (9)Mixtures of helium and oxygen are used in scuba diving. What are (a) the mole fractions of the two gases (b)their partial pressures and (c) the total pressure in a mixture of 1.96g He and 60.8g O2 confined in a 5.00-L tank at 25。C? (6) (10)What is a thermocouple wire for temperature measurement? Briefly describe its working principle (4%) (11)Briefly describle methods for measuring the pressures at about (1) 1000 Torr and (2) 1x 10^-7 Torr [hinet: Making simple sketches and pointing out each component of the devices may be helpful for interpretation] (10%) (12) What are the four principal assumptions of the kinetic molecular theory for ideal gas particles? (4%) (13)(a) Under what pressure and temperature conditions, a real gas will exhibit behavior that is close to ideal behavior? (low, moderate, high) (2%) (b) In van der Waals's equation, {P+(n^2a/V^2)}(V-nb)=nRT what properties of real gas particles are the constants "a" and "b" related to? (2%) (14)Neglecting intermolecular collisions,calculate the impact rate on a 400.0cm^2 section of a vessel containing oxygen gas at a pressure of 1.00 atm and 27。C (4%) (15)A compound contains only C, H, and N. It is 58.51% C and 7.37% H by mass. Helium edduses through a porous frit 3.20 times faster than the compound does. Determine the empirical and molecular formulas of this compound. (4%) (16)The average distance that a molecule travels between collisions is called its "mean free path, λ". If one knows that λ=50m at a pressure of 1×10^-6 Torr for a N2 molecule, what is the mean free path for the N2 molecule near you ? (4%) --

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