課程名稱︰普通化學丙 課程性質︰ 課程教師︰佘瑞琳 開課學院： 開課系所︰ 考試日期（年月日）︰2015/03/20 考試時限（分鐘）：120 min 10:20am - 12:20pm 試題 : General Chemistry Midterm Exam 2015/03/20 Gas constant: R 8.314 J/mol.K = 0.082 L.atm/mol.K; 1L.atm = 101.3J H = 1.01; C = 12.01; N = 14.01; O = 16.00; S = 32.07; Cl = 32.45; I = 126.9; Na = 22.99; Pb = 207.2 I. Multiple choices questions (30%, 2 points per question, each may have 1-4 correct answers) 1. For the following measures, which one shows three significant figures? (a)5.80g (b)0.058g (c)5.8*10^2g (d)508g 2. Which of the following calculations show three significant figures in the answer? (a)555+777 (b)876-26 (c)123*2.5 (d)(767-27)*285.2 / 0.110*273.15 3. Which of the following is the intensive property? (a)concentration (b)temperature (c) density (d)volume 4. Choose the correct conversion in the followings: (a)1.5*10^-9 m = 15nm (b)35mg = 0.35g(c)212F = 100C (溫度) (d)5uL = 5*10^-6L 55 5. For the ion Mn2+ , which of the following sataement is correct? 25 (a)the atomic number is 25 (b)the mass number is 55 (c)the number of electrons is 25 (d)the number of protons is 30 6. Which of the following is alkaline earth metal? (a)Na (b)Ca (c)Co (d)La 7. Solubility rules prdict precipitate formation for mixing 0.1M aqueous solutions of (a)H2SO4 and Pb(NO3)2 (b)HCl and Ca(NO3)2 (c)H2S and AgNO3 (d)Na2CO3 and Ba(NO3)2 8. Which of the following is weak electrolyte? (a)HI (b)HF (c)CH3NH2 (d)HNO2 9. Which of the following underlined (我用中括號刮起來) atoms show the highest oxidation number? (a)K[Mn]O4 (b)H2[S]O3 (c)H2[O] (d)[C]O2 10. Consider the reaction: 2NaI(s) + SO42-(aq) --------> 2Na+(aq) + I2(s) + SO2(g) + 2H2O(l) (a)H+ is oxidant (b)SO42- is reduced (c)NaI is reducing agent (d)NaI is oxidized. 11. Consider 1.0 mol of He and CH4 gases are in the same container and room temperature. Which of the following statement is true? (a)They show same partial pressure (b)Helium has higher average kinetic energy (c)Both gases show same root-mean-square speed (d)The effusion rate of He is greater than CH4 gas. 12. A mixture of CH4 and SO2 gas is placed in an effusion apparatus. Calculate the effusion rate of CH4 to SO2. (p.175) (a)4:1 (b)1:4 (c)2:1 (d)1:2 (e)1:1 13. Under what set of conditions would CO2 gas behave most ideally? (a)-15C and 1 atm (b)-15C and 5 atm (c)25C and 5 atm (d)25C and 1 atm 14. For the van der Waals equation, nRT = [P + a(n^2/V^2)](V - nb), which of the following is true? (a)It uses constant b to correct the volume of gas particles (b)The contant b of CH4 is greater than H2 (c)It uses constat a to correct the inter particle forces (d)The a value of H2(g) is greater that CH4(g) for hydrogen bonding. 15. Which of the following is the functional group of the molecule shown? OH H- - C - C - CH2OH OH= - H (a)amino group (b)carboxyl group (c)hydroxyl group (d)carbonyl group II. Problems(70%) 1. Give the systematic name of the following compounds: (10%) (a)HF(aq) (b)Cu(NO3)2 (c)NaHCO3 (d)N2O4 (e)HClO4 2. Write the chemical or structural formula of the following compounds: (10%) (a)ethanol (b)I-pantene (c)2,3-dimethylhexane (d)aluminum oxide (e)potassium hydrogen phosphate 3. Write all the structural formula for the isomers of C4H8 (4%) 4. A dry clean solvent (M = 146.99g/mol) that contains C, H, and Cl is suspected to be a cancer-causing agent. When 0.250g sample was studied by combustion analysis, 0.451g of CO2 and 0.0617g of H2O formed. Find the molecular formula? (10%, p.84) 5. Calculate the (a)molarity (b)molality, and (c)mole fraction of NH3 in an 8.00% (by mass) aqueous solution (d = 0.9651g/ml) (6%) 6. If 40.0 mL of lead(II) nitrate solution reacts completely with excess sodium iodide solution to yield 0.628g of precipitate, what is the molarity of lead(II) ion in the original solution? (10%, 4.28) 7. A sample of a liquid hydrocarbon known to consist of molecules with five carbon atom is vaporized in a 0.204L flask by immersion in a water bath at 101C (temp.). The barometric pressure is 767torr, and the remaining gas weigh 0.482g. What is the molecula formula of he hydrocarbon? (10%, 5.45) 8. The safety air bags in automobiles are inflated by nitrogen gas generated by the rapid decomposition of sodium azide, NaN3: NaN3(s) ---> Na(s) + N2(g). If an air bag has a volume of 36.0L and is to be filled with nitrogen gas at a pressure of 1.15atm and a temperature of 27.0C, how many grams of NaN3 must be decomposed? Balance the chemical equation first. (10%) -- --

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