课程名称︰普通化学甲上 开课性质︰必带 课程教师︰佘瑞琳 开课学院：理学院、生农学院 开课系所︰地质系、大气系、农化系 考试日期（年月日）︰2012/01/11 考试时限（分钟）：100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, C=12.01, Cl=35.45 Ne=20.3, Na=22.99, P=30.98, Cu=63.5 C=3.00*10^8 m/s; h=6.626*10^-34 J-s;Rh=1.096776*10^7 m^-1;1eV=1.6*10^-19 J Gas constant: R=8.314 J/mol-K=0.082 L-atm/mole-K; 1 L-atm=101.3J I.Multiple choices questions(40%) 1.A sample of O2 gas intially at STP is compressed to a smaller volume at con- stant temperature. Which of the following will be changed during the process? (a)the average kinetic energy of the molecules (b)the average speed of the molecules (c)the number of collision they make with the container walls per unit time (d)the pressure of the gas -->cd 2.What is the rms speed of an atom in a sample of He gas at 25。C? (a)43.1 m/s (b)135 m/s (c)395 m/s (d)1.36*10^3 m/s -->d 3.For one mole of the following gases at 25。C and 1atm: C2H4(28 g/mol), N2(28 g/mol), CO(28 g/mol), which of the following camparison is correct? (a)the average kinetic energy: C2H4 = N2 = CO (b)the rms speed of the molecules: C2h4 = N2 = CO (c)the effusion rate of the molecules: C2H4 = N2 = CO (d) the density: C2H4 = N2 = CO -->abcd 4.The effusion rate of an unknown gas is measured and found to be 25.44 mL/min. Inder the identical experimental conditions the effusionrate of O2 is found to be 30.50 mL/min. Which of the following is the unknown gas: (a)Ne (b)CH4 (c)NO (d)NO2 (e)none of all above -->d 5.Which of the following molecules can form hydrogen bonding with other molecules of the same kind? (a)methanol (b)acetone (c)methyl fluoride (d)hydrogen sulfide -->a 6.Which of the following molecules can form hydrogen bonding with water? (a)propanal(CH3CH3CHO) (b)aminomethane (c)acetone (d) HO H O HO\◥◥／ ＼═O 　　　　　　　　　　　　　　　　　　　　　　　　　　 ￣￣＞=＜ HO OH -->abcd 7.Which of the following ranking about boiling point is correct? (a)F2<HF<BaF2 (b)CH4<C2H6<CH3NH2 (c)LiCl<NaCl<KCl (d)N2<O2<F2 -->bd 8.Which of these substances is likely to exhibit liquid crystalline behavior? (a)CH3CH2CH2CH2Ch2CH2CH2CH2CH3 CH3 │ (b) CH3─CH2─ C─CH2─CH3 │ CH3 O ║ (c) CH3CH2─◎─N═N─◎─ C─OCH3 O ║ (d) ◎─CH2─ C─O-Na+ (*◎为苯环) -->c 9.Suggest an element that could be used to dope silicon to yield a p-type semiconductor. (a)P (b)As (c)Ga (d)Ge -->c 10.For the following aqueous solutions choose the correct ordering of thier expected boiling points: (a) H2O < 0.15m C6H12O6 (b)0.10m HCl < 0.15m C6H12O6 (c)0.050 m CH3COOH < 0.050m HCl (d)0.10m CaCl2 = 0.10m NaCl -->ac 11.The average osmotic pressure of blood is 7.7 atm at 25。C. What molarity of glucose(C6H12O6) will be isotonic with blood? (a)0.0031M (b)0.037M (c)0.31M (d)3.7M 12.Which of the following ranking is correct? (a)Solubility in toluene: Na2SO4 < HCl < I2 (b)Solubility in water : Na2SO4 < HCl < I2 (c)Solubility in water : O2(g)(25。C) < O2(g)(35。C) (d)Solubility in water : C6H14 < C2H5OC2H5 < CH3COCH3 -->ad 13.A white substance melt with some decomposition at 730。C. As a solid, it does not conduct electricity, but it dissolves in water to form a conducting solution. Which type of solid might the substance be? (a)molecular solid (b)metallic solid (c)ionic solid (d)covalent network solid -->c 14.The nylon Nomex has the structure on right. 请视他为苯环 O　│　 O ║　↓　║ H2N NH2 [／＼//＼／＼NH ]n ＼//＼／ │ ║　　 ＼ ／ │ ║ 　　 \\／ 　　//＼／NH (a) 　\\／　is one of the monomers 　　　　　　│　║ 　　　　　　　　　　　　　　　　　　　　　　　　　　　　 \\／ (b)This is a copolymer. (c)The monomers are linked by ester bond. (d)The polymer shows hydrogen bonding between polymer chains. -->bd 15.Which of the following could be used as a semiconductor? (a)Si (b)GaAs (c)ZnSe (d)ZnS -->ac 16.A sample of CaCO3 is decomposed, and the carbon dioxide is collected in a 250-mL flask. After decomposition is complete, the gas has a pressure of 1.3 atm at a temperature of 31。C. How many molecules of CO2 gas were generated? (a)0.0013mol (b)0.013mol (c)0.13mol (d)13mol -->b 17.Which of the following processing will increase the hardness of a polymeric meterial? (a)increasing crystallinity (b)crosslinking (c)addition of a plasticizer (d)branching of chains -->ab 18.Rank the following in order of increasing energy gap: (a)Zn < Ge < Ge doped with As < I2 (b)Ge < Ge doped with As < I2 < Zn (c)Zn < Ge doped with As < Ge < I2 (d)I2 < Ge < Ge doped with As < Zn -->c 19.For the phase diagram of compound X. Which of the following is true? P(atm) ↑ B D 1.0│﹍↘│﹍ │↙C │ ∕ / │ A∠＿╱ │_╱ └┴┴┴┴┴→T(。C) 20 40 (a)At 20。C and 1atm, X will exist as a liquid. (b)The normal melting point of X is about 30。C (c)The critical point of compound X is point A. (d)The melting point of the compound X increase with in creasing pressure. -->bd 20.Which of the following statements about face-centered cubic crystal stucture is true? (a)It has 2 atoms/unit cell. (b)The coordination number of atoms is eight. (c)It is one of the closest packing (d)It's also named hexagonal closest packing (hcp). -->c II.Problems (60%) 1.Automobile air bags are inflated by nitrogen gas generated by the rapid decomposition of sodium azide, NaN3: NaN3(s) → Na(s) + N2(g) (a)Balance the chemical equation. (b)If an air bag has a volume of 36L and is to be filled with nitrogen gas at 1.15 atm and 26.0。C, how many grams of NaN3 must be decomposed? (4%) 2.The atmospheric concentration of CO2 gas is presently 385 ppm (by volume) at 25。C and 1 atm. (a)Calculate the number of molecules of CO2 in one liter of air. (b)What is the mole fraction of CO2 in the atmosphere? (4%) 3.(a)List two experimental conditions under which gases deviate from ideal behavior. (b)List two reasons why the gases deviate from ideal behavior. (c)Write the van der Waal's equation to predict the behavior of ideal gases. (6%) 4.The unit cell of a binary compound of copper and oxygen is shown here. Given this image and the ionic radii rCu+ = 0.74A and rO2- = 1.26A, (a)determine the emperical formula of this compound, (b)determine the coordination number of copper and oxygen, (c)estimate the length of the edge of the cubic unit cell, and (d)estimate the density of the compound. ●────● /│ /│ /│○ /│ / │ / │ ●───○● │ │ │ ● │ │ │ ●──○─● │ / │ / │ /○ │ / │/ │/ ●────● (10%) 5.A sulfuric acid solution containing 576.1g of H2SO4 per liter of solution has a density of 1.329 g/cm^3. Calculate (a)the mass percentage, (b)the mole fraction, (c)the molality, (d)the molarity of H2SO4 in this solution. (8%) 6.A solution has a 1:4 mole ratio od pentane to hexane. The vapor pressure of the pure hydrocarbons at 20。C are 441 mmHg for pentane and 121 mmHg for hexane. (a)What is the mole fraction of pentane in the solution? (b)Assuming ideal solution behavior, what is the vapor pressure of the solution at 20。C? (c)What is the mole fraction of pentane in the vapor above the solution? (d)Which component is more volatile, pentane or hexane? (10%) 7.Green light-emitting diodes can be made from a solid solution of GaP and AlP. These two compounds have band gaps that are 2.26eV and 2.43eV, respectively. If we assume that the band gap of Ga(1-x)AlxP solid solution varies liearlyfrom GaP to AlP, what composition would be needed for the emitted light to have wavelength of 520nm? (10%) 8.For each of following polymers, (a)write the structure of the monomers and (b)indicate the type of polymerization. (i) (ii) [─H2C CH2─]n ＼　　／ O O 　　　　　　　　　　　　　　　　　 C═C [╨◎╨O─CH2─CH2─O─]n ／　　＼ 　　　　　　　　　　　　　　　　　　　　　　　 H H --

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