课程名称︰普通化学甲 课程性质︰必修 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）︰2012/10/17 考试时限（分钟）：110 min 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) : H = 1.00, C = 12.04, O = 16.00, K = 39.10, Cl = 35.45, Br = 79.90 Na = 22.09, P = 30.98 R = 0.082 L-atm/mol-k = 8.314 J/mol-K; 1 L-atm = 101.32J I.Multiple choice (There maybe more than one correct answers. 2 points each, 20%) 1.For the following measurements, choose the one that has two significant figures. (a) 0.022g (b)24.0℃ (c)205ml (d)2.16 * 10^2 mmHg -> a 2.Which of the following calculations show two significant figures in the answer ? (a)406 * 0.0022 (b)0.4581 + 0.12 - 0.037 (c) (1.40 * 10^2 )(8.76 * 10^-4)/(9.2 * 10^-3) (d)(8.002 + 0.3040)/(13.4 - 0.066 + 1.02) -> abc 3.Choose the one which shows the correct conversion. (a)127 mL = 1.27 L (b)5.0 μL = 5.0 * 10^-6 L (c)15 nm = 1.5 * 10^-9 m (d)93 K = -180 °C = -292 °F -> bd 80 2- 4.For the anion of 34 Se , it has (a)34 protons (b)34 electrons (c)80 neutrons (d)80 neucleons -> ad 5.Which if the following element is metalloid ? (a)Ca (b)Co (c)As (d)P4 -> c 6.Which solution is the best electrical conductor ? (a)0.025M Ba(NO3)2 (b)0.030M RbNO3 (c)0.060M CH3COOH (d)0.60M CH3CH2OH -> a 7.Which of the following is redox reation ? (a)Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g) (b)NH3(g) + HCl(g) → NH4Cl(s) (c)2H2O2(aq) → O2(g) + H2O(l) (d)K2CrO4(aq) + 2H+(aq) → K2CrO4(aq) + H2O(l) -> ac 8.Whcih of the following underlined atom shows the highest oxidation state ? (a)H2O2 (b)Al2O3 (c)CH4 (d)OF2 ^ ^ ^ ^ -> d 9.Separate samples of an unknown salt are treated with dilute solutions of HCl, H2SO4, and NaOH. A precipitate forms in all three cases. Which of the following could be the cation of the unknown salt? 2+ 2+ 2+ 2+ (a)Ba (b)Hg2 (c)Cu (d)Pb -> d 10.A gas is confined to a cylinder under constant atmospheric pressure. When the gas undergoes a particular chemical reaction, it absorbs 723J of heat from its surroundings and does 65J of P-V work on its surroundings. (a)q = +723J (b)w = +65J (c)△U = 788J (d)△H = +723J -> ad II.Problems(80%) 1. Name or give the chemical formula for the following compounds.(20%) (a)N2O5 (b)Fe(OH)3 (c)NaHCO3 (d)ZnS (e)HClO2 (f)CH3CH=CH2 (g)hydrosulfuric (h)nitric acid (i)calcium dihydrogen phosphate (j)2-methyl-1-pentanol 2.Represent the succinic molecule, HOOCCH2CH2COOH, trough empirical, molecular, structural, and line-angle formula.(6%, p.71) 3.For the following compounds indicate and name the functional groups.(6%) (a) (b) H NH2 | | CH3CH2 – C –CHO H3C - C - COOH | | CH3 H 4.Write the balanced equation for the reation.(6%) (a)PbO + NH3 → Pb + N2 + H2O _ _ _ (b)MnO4 (aq) + CN (aq) → MnO2(s) + OCN (aq) (in basic solution) _ _ (c)Cl2(g) → Cl (aq) + ClO3 (aq) (in basic solution) 5.Sorbitol, usded as a sweetener, has a molucular mass of 182 u and a mass percent composition of 39.56% C, 7.74% H, and 52.70% O. What are the empirical and molecular formulas of sorbtol? (6%, p.81) 6.Formaldehyde, CH2O, can be made from methanol by the following reaction, using a copper catalyst. CH3OH(g) → CH2O(g) + H2(g). If 25.7g CH2O(g) is produced per mole og methanol that reacts, what are (a) the theoretical yield (b) the actual yield (c) the percent yield (6%, p.133) 7.Two solutions, 25.00 mL of 2.50 M HCl(aq) and 25.00 mL of 2.50 M NaOH(aq), both initially at 21.1°C, are added to a Styrofoam-cup, calorimeter and allowed to react. The temperature rises to 27.8°C. (a)Determine the best of neutralization reation, expressed per mole off H2O formed. (b)Is the reaction endothermic or exothermic ? (c)IS this the qv or qp ? Ignore the small heat capacity of the Styrofoam cup and assume the density and specific heat is same as water(s = 4.184 J/g°C)(8%, p.251) 8.Given that △Hf°[AgI(s)] = -61.84 kJ/mol, what is the standard enthalpy change for the precipitation of silver iodide ? (4%, p.274) 9.Ants release formic acid (HCOOH) when they bite. Use the data in Table7.2 and the standard enthalpy of combustion for formic acid (△H° = -255 kJ/mol) to calculate the standard enthalpy of formation for formic acid. Write the formation reaction equation first. (4%, 7.93) 10. The heat of combustion of 2-propanol at 298.15 K, determined in a bomb calorimeter, is -33.41 kJ/g. For the combustion of one mole of 2-propanol, determine (a)△U , and (b) △H . (10%, 7.65) 11.A typical commercil-grade phosphoric acid is 75% H3PO4, by mass, and has density = 1.57 g/mL. Calculate (a)the molarity and (b)molality of acid. (4%) PS.附 TABLE 7.2, TABLE 7.3 --

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