key-q2cde - Quiz Number 2 Chemistry 122, Dr. Mathews...

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Unformatted text preview: Quiz Number 2 Chemistry 122, Dr. Mathews Tuesday, Jan 23, 2007 Name Carmen ID Lab Instructor/ Section No: 1. (2 pts) Use the vapor pressure diagram on the right to estimate the boiling point of diethyl ether at 600 torr. Nari-mi! baiting W”? I S’s.3"1'_' (3 WOT.“ r) a: f» V , , paint. . . _ we ‘ y, 2. (2 pts) Use the same vapor pressure dlagram to estimate the vapor pressure of . mm x, alcohol at OC' Sam {annual} 2’ Water «c3523 7%” 3. (4 pts) In the zinc blende structure shown at the right, the Zn2+ ions are shown at the corners and faces of the unit cell, while the sulfide ions are imbedded. a) How many zinc ions and how many sulfide ions are in the unit cell? Be sure to identify the contribution from each kind of location. A r Z2731 mornpr :/ 5'2; )hé/JEngx/Zel \} /’ Ethylene 'l ' ' i “Empire:th (’12:: aces —- {9X 72f”; ‘7’ ' b) What IS the class1ficat10n\o\f iscu Lug}; l(pr1m1t1Ve-,-f entered, or body centered cubic)? j? €5,353” c, a? 4. (6 pts) A gas of unknown molecular mass effuses through a small—opening into a a” Z“5 vacuum at a rate of 1.0 L in 105 s. Under identical conditions the effusion rate of 02 (MW = 32) is 1.0 L in,31 s. What is the MW ofthe unknown gas? 5235: prflb. M39 5. (6 pts)PC13 is more volatile than AsCl3 at 25 °C. Use this fact and answer the following questions. a) Which has the higher vapor pressure at 25 °C? W23 b) Which has the higher boiling point? flsflg} c) Which has the greater intermolecular forces? \ 5/4”; ) Walla 5”? s (WK/m flaw/’3»; I; v . ,iw W ,s .m x Quiz Number 2 Chemistry 122, Dr. Mathews Tuesday, Jan 23, 2007 Name Carmen ID Lab Instructor/ Section No: l. (2 pts) Consider the following substances: Kr (AW=84), CHCl3 (MW=120), NH3 (MW=17). ' a) Which has the largest dispersion forces? _ / i £13 b) Which has/have dipole-dipole fOrces? / fl/Méj ) W/é c) Which has/have hydrogen-bonding? A/fié 2. (6 pts) The normal MP and BP of 02 are- 218 °C and - 183 °C, respectively. Its triple point is at - 219 °C and 1.14 torr. Its critical point is at - 119 °C and 49.8 atm. ' a) Sketch the phase diagram on the reverse side of this quiz, showing the four points given above and labeling each region as the phase present 5% afiévafla/ 770758 .53 M m M Mme b) Will solid ox gen float on 1i uid oxygen? Explain. ‘ \ Q a A . My, ‘Me 5 fem” %/ejr5%m 59 v WAX” c) Will solid oxygen at l atrn melt or sublime as it is heated at constant pressure? ml+ 3. (6 pts) Consider the unit cell shown on the right with calcium (corners), oxygen (faces) and titanium (center) in it. a) For each of the atoms, indicate its location, the number at that (those) location(s) and its net contribution to the unit cell. mew» Ma r»- LWW, W1 gift: 0" géceS) :3 'I‘itiifium b) What is the chemical (empirical) formula for the compound? as 77$; c) How would you classify this unit cell (primitive, face centered, or i % body centered cubic)? ~ t r I p WM/ 741/6 4. (6 pts) Indium crystallizes in a cubic close-packed structure (face-centered cubic cell) that has an edge length of 3.833 A. a) How many indium atoms are in a unit cell? 51 \H b) Assume the atoms are represented as spheres which touch along the diagonal of the face. What is the atomic radius in A of an iridium atom? a / 33/4 mafia : gr 5 c) What is the density of indium in g/cm3? Its atomic weight is 114.8. Recall that l A = 10'8 cm, 1 amu=1.6606x10' g, and N=6.02x10 mol‘. Afiéaé/szyg) 1” 3.55%”? 4W!) : gift: WWW/w; 3 ’ (3,3331%) 1 Quiz Number 2 Chemistry 122, Dr. Mathews Thursday, Jan 25, 2007 Name Carmen ID Lab Instructor/ Section No: 1. (2 pts) Identify the molecules that can have hydrogen-bonding between molecules of the same kind. CH3F, CH3C1, CH3SH, NF3,[ Nfig) 2. (2 pts) Consider the following substances: Kr (AW=84), CHCl3 (MW=120), NH3 (MW=17). a) Which has the largest dispersion forces? @ W3 b) Which has/have dipole-dipole forces? (if! fig) 3 c) Which has/have hydrogen-bonding‘wht I . «'3 3. (6 pts) The normal MP and BP of Xe are - 112 °C and - 107 °C, respectively. Its triple point is at - 121 °C and 282 torr. Its critical point is at 16.6 °C and 57.6 atm. a) Sketch the phase diagram on the reverse side of this quiz, showing the four points given above and labeling each reglon as the phase present. 8g imp/3715, pa 9 6 b) Which is more dense, the s lid or the liquid? Explain. . 60 Re» More emit”, 510%? m6, #546? ’23 “5901/ We /5 c) If Xe gas is cooled under a constant external pressure 0 100 torr, will it undergo condensation or deposition? Explain. dfiflgéll’”;m '” dwarf (thanga ‘f/I‘JW? gas 429 63/), (’%fl”%“fl4’ é £3ng 71/7/14: gal/474, 4. (4 pts) In the zinc blende structure shown at the right, the Zn2+ ions are shown at the corners and faces of the unit cell, while the sulfide ions are imbedded. a) How many zinc ions and how many sulfide ions are in the unit cell? Be sure to identify the contribution from each kind of location. / (b) m; £0245! flame/.57 g X? s / 52”" #15/ L/é/ / {86153,} 6 X b) What is the classification 0 thisgcfibifc unit cell (primitive, face centered, or body centered cubic)? 74W, (36324 7% A? 6/ flax/Pa. 5. (6 pts) Aluminum crystallizes in a cubic close-packed structure (face-centered cubic cell). a) How many aluminum atoms are in a unit cell? ,/“ él l o b) Assume the atoms are represented as sphere ' a radius of 1.34 A. What is the length of the side of the unit cell? (1 A = 10’8 cm) » ‘9 ///" 0 a ' ) What is the density of aluminum? Its atomic weight is 26.98. Recall that 1 A = 10'8 cm, 1 amu = " 1.6606 x 1044 g, and N = 6.02 x 1023 mol‘l. /, 6 mxmiyé) Wflflflflzéflgflm *7/35?” A z p 11/3/15: 7[/‘3 ...
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This note was uploaded on 06/11/2011 for the course CHM 122 taught by Professor Woodward during the Winter '07 term at Ohio State.

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key-q2cde - Quiz Number 2 Chemistry 122, Dr. Mathews...

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