Chemistry 31A Autumn 2004 Professors Chidsey & Zare Exam 4 Name: 9:00am 10:00am 2:15pm 3:15pm 7:00pm 8:00pm S02 OC103 Charles

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1 Chemistry 31A Autumn 2004 Professors Chidsey & Zare Exam 4 Name: Honor Code Observed: (Signature) 9:00am 10:00am 2:15pm 3:15pm 7:00pm 8:00pm S02 OC103 Charles S04 OC103 Charles S06 OC110 Scott S Charles S12 Ricker Liz S15 Ricker Liz Circle your section S03 OC110 Tiffany S05 OC110 Charina S P Liz S13 Lagunita Scott S14 Stern Charina S16 Lagunita Scott S18 Stern Charina S17 Wilbur Tiffany S19 Wilbur Tiffany Instructions: This is a closed book and closed notes exam. You may use a calculator. If more space is needed, use the back of the page and clearly indicate that this was done both on the front of that page and in the check boxes below. Box your answers! Show your work for full credit. Crossed out or erased material will not be graded. Be careful of the dimensions, units and significant figures of all quantities. This exam contains 6 pages, none of them blank. Write your name on each one. Useful Information on last page of exam STUDENT FILL THIS OUT! grade initials I have used the back of the following pages (check box): Total page 1 of 6 e4 11/20/2004

2 1. Two spherical bulbs, each having a volume of 1 L and each at a temperature of 273 K, are connected by a thin tube of negligible volume. Initially the tube is shut and the bulb on the left contains 1 atm of an ideal gas and the bulb on the right contains no gas, that is, the bulb on the right is completely evacuated. Then the valve is opened. The situation is pictured below where the valve is closed on the upper panel and opened on the lower panel. V = 1 L P = 1 atm V = 1 L P =? atm V =1 L P =? atm V =1 L P =? atm (a) (5 pts) Before the valve is opened, what is the pressure in the evacuated bulb on the right? (b) (5 pts) After the valve is opened, what are the pressures of each bulb? (c) (5 pts) After the bulb is opened, what is the number of moles of ideal gas in the bulb on the right? (d) (10 pts) How does the average kinetic energy of the ideal gas change upon opening the bulb? Explain your answer. page 2 of 6 e4 11/20/2004

3 2. (8 pts) For each of the following pairs, circle the stronger intermolecular interaction: (a) dipole - dipole dipole - induced dipole (b) ion dipole induced dipole induced dipole (c) dipole dipole ion ion (d) induced dipole - dipole induced dipole induced dipole 3. (10 pts) For each of the following pairs of species, name the dominant intermolecular interaction. (a) Ar Ar (b) Na + - SO 2 (c) CHCl 3 CHCl 3 (d) CH 3 Cl CH 4 (e) NH SO (6 pts) Write the following in order of increasing vapor pressure at room temperature: H 2 O, NaCl and CO 2 page 3 of 6 e4 11/20/2004

4 5. (10 pts) After each reaction indicate all of the following that are involved: dissolution (D) precipitation (P) acid/base neutralization (N) redox (R) (a) CaH 2 (s) + H 2 O(l) 2 H 2 (g) + Ca 2+ (aq) + 2 OH - (aq) (b) 2 Fe 2+ (aq) + 4 Cl - (aq)+ Na + (aq) + I 3 - (aq) 2 Fe 3+ (aq) + 4 Cl - (aq)+ Na + (aq) + 3 I - (aq) (c) NaCl(s) Na + (aq) + Cl - (aq) (d) 2 HCl(aq) + Mg(OH) 2 (aq) Mg 2+ (aq) + 2 Cl - (aq) + 2 H 2 O(l) (e) Ag + (aq) + NO 3 - (aq) + Na + (aq) + I - (aq) AgI(s) + Na + (aq)+ NO 3 - (aq) 6. (12 pts) An 84.1 mg sample of a pure gaseous hydrocarbon occupies 73.8 ml at 300. K and atm. The sample is then burned completely in excess oxygen yielding 264 mg CO 2 and 108 mg H 2 O. Determine the molecular formula of the compound. page 4 of 6 e4 11/20/2004

5 7. (a) (10 pts) Diazomethane is a reactive gaseous compound with the connectivity N-N-CH 2. Draw two acceptable Lewis dot resonance structures. Circle the preferred structure, explain why it is preferred, and give the N-N-C angle. (b) (14 pts) 2.0 L of diazomethane gas, N 2 CH 2, at 0 C and 1.10 atm is slowly dissolved into 50. ml of a 1.0 M solution of CH 3 CO 2 H dissolved in diethyl ether. The following reaction occurs to completion: N 2 CH 2 (soln) + CH 3 CO 2 H(soln) CH 3 CO 2 CH 3 (soln) + N 2 (g) What volume of N 2 (g) is expected to be formed at 0 C and 1.00 atm? Assume all gases behave ideally and that all species other than N 2 remain in solution. (c) (5 pts) You are asked next to explore the accuracy of one of the approximations made in part (b). The vapor pressure of pure diethyl ether is 0.20 atm at 0.00 C and the mole fraction of diethyl ether in the solution is Taking account of the vapor pressure of diethyl ether, what is the expected partial pressure of dinitrogen in the gas evolved from the solution at a total pressure of 1.00 atm? Assume the solubility of dinitrogen and the vapor pressures of the solutes are negligible and that all gases behave ideally. page 5 of 6 e4 11/20/2004

6 Useful Information: Ideal Gas Law: PV=nRT R = J mol -1 K -1 = L atm mol -1 K -1 1 mol of molecules of an ideal gas occupies L at C and atm. 1 mol = x atm = x10 5 Pa = x10 5 kg s -2 m -1 temperature in C = (temperature in F - 32 F) x (5 C)/(9 F) Absolute zero = 0 K = C density of water = 1.0 g/cm 3 density of mercury = 13.6 g/cm 3 density of air at 1 atm and 25 C = 1.2x10-3 g/cm 3 Pressure due to column of incompressible fluid = (acceleration due to gravity)(fluid density)(height of column) Acceleration due to gravity at earth s surface = 9.81m s -2 Pressure rises about 1.0 atm for every 10. m or 34 ft of depth into water. 1 m = 39.4 in Trigonal angle = 120 Tetrahedral angle = Octahedral angle = 90 1A 1 H Li Na K Rb Cs A 3A 4A 5A 6A 7A 4 Be Mg Ca Sr Ba B 4B 5B 6B 7B 8B 8B 8B 1B 2B 21 Sc Y La Ti Zr Hf V Nb Ta Cr Mo W Mn Tc Re Fe Ru Os Co Rh Ir Ni Pd Pt Cu Ag Au Zn Cd Hg B Al Ga In Tl C Si Ge Sn Pb N P As Sb Bi O S Se Te Po F Cl Br I At 210 8A 2 He Ne Ar Kr Xe Rn 222 page 6 of 6 e4 11/20/2004

Chemistry 31A Autumn 2004 Professors Chidsey & Zare Exam 2 Name:

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