mcdonald (pam78654) – HW 5: Condensed Matter – laude – (89560) 1This print-out should have 16 questions.Multiple-choice questions may continue o nthe next column or page – find all choicesbefore answering.001 10.0 pointsWhich one of the following substances is IN-CORRECTLY matched with the kind of solidthat it forms?1. methane : molecular2. sulfur dioxide : molecular3. graphite : covalent4. calcium bromide : ionic5. lithium : covalent002 10.0 pointsWhy does it take longer to cook foods inboiling water at higher altitude than at orbelow sea level?1. The ambient temperat ure is lower athigher altitudes.2. There is a reduction in atmospheric pres-sure.3. It does not take longer.4. There is an increase in atmospheric pres-sure.003 10.0 pointsArrange the compoundsCsCl, BaCl2, diamond (C), H2, HFin order of increasing expected melting points.1. H2, HF, diamond, CsCl, BaCl22. HF, H2, CsCl, BaCl2, diamond3. H2, HF, CsCl, BaCl2, diamond4. HF, H2, diamond, CsCl, BaC l25. H2, HF, BaCl2, CsCl, diamond004 10.0 pointsWhich of the following statements regardingintermolecular forces (IMF) is/are true?I) Intermolecular forces result from at trac-tive forces between regions of positiveand negat ive charge density in neighbor-ing molecules.II) The stronger the bonds within a moleculeare, the stronger the intermolecularforces will be.III) Only non-polar molecules have instanta-neous dipoles.1. II and III2. I only3. II only4. III only5. I and III6. I and II7. I, II, and III005 10.0 pointsWhich of the following is not correctly pairedwith its dominant type of intermolecularforces?1. NH3, hydrogen bonding2. HBr, hydrogen bonding3. C6H6(benzene), instantaneous dipoles4. CaO, ionic forces5. SiH4, instantaneous dipoles006 10.0 pointsIdentify the dominant intermolecular forcein the following species, respectively: RbCl,mcdonald (pam78654) – HW 5: Condensed Matter – laude – (89560) 2C6H6(benzene), HI, Fe2O3, CH2NH.a) i onic forcesb) hydrogen bondingc) dipole-dipoled) instantaneous dip oles1. b, d, c, d, d2. a, c, c, d, b3. c, d, a, a, b4. a, b, d, a, c5. a, b, c, b, a6. a, d, c, a, b7. c, b, d, c, c007 10.0 pointsWhich of the following statements about boil-ing is false?1. For a given pressure, the boiling point isalways at a higher temperature than meltingpoint.2. Boiling occurs when vap or pressure ex-ceeds atmospheric pressure.3. As intermolecular forces increase, boilingpoint increases as well.4. The boi ling point of a liquid is indepen-dent of atmospheric pressure.008 10.0 pointsDispersion (London) forces result from1. attractive forces between a molecule atthe surface of a liquid and those beneathit which are not balanced by correspondingforces from above.2. the formatio n of a loose covalent link-age between a hydrogen at om connected toa very electronegative atom in one moleculeand another very electronegative atom in aneighboring molecule.3. attraction between molecules in a l iquidand molecules or atoms in a solid surface withwhich the liquid is in contact.4. distortion of the electro n cloud of an atomor molecule by the presence of nearby atomsor molecules.5. the balance of attractive and repulsiveforces between two polar molecules.009 10.0 pointsConsider four moleculesI) CHCl3II) CH4III) C H3ClIV) CCl4Which of these exhibit permanent dipole-dipole interactions?1. I, III, and IV onl y2. None of these3. I and III only4. I only5. III only010 10.0 pointsClassify the solid dry ice (CO2).1. ionic2. molecular3. network4. None of these011 10.0 pointsWhich best describes the hydrogen bondingbetween two water molecules?hydrogenoxygenmcdonald (pam78654) – HW 5: Condensed Matter – laude – (89560) 31.2.3.4.012 10.0 pointsIn which of these compounds would you findONLY dispersion forces existing between themolecules?I. CO2;II. CCl4;III. CH2Cl2;IV. NH3.1. II and IV only2. III and IV only3. II only4. I and IV only5. I only6. III only7. I and III only8. II and III only9. IV only10. I and II only013 10.0 pointsRank the following compounds by boil-ing point, from lowest to highest: HF,sugar (C6H12O6), H2O, NH3.1. HF < H2O < sugar < NH32. H2O < NH3< sugar < HF3. NH3< HF < H2O < sugar4. H2O < sugar < NH3< HF014 10.0 pointsRank the following liquids by viscosity, frommost viscous t o least: C5H12, CH4, C3H8,C2H6, C4H10.1. CH4> C2H6> C4H10> C3H8> C5H122. CH4> C2H6> C3H8> C5H12> C4H103. C5H12> C4H10> C3H8> C2H6> CH44. C5H12> C3H8> C4H10> C2H6> CH45. CH4> C2H6> SC3H8> C4H10> C5H12015 10.0 pointsRank the following species by va-por pressure, from lowest to highest:K2S, CHCl3, Kr, CH3NH2, CHF3.1. K2S < CH3NH2< CHF3< CHCl3< Kr2. CH3NH2< CHCl3< CHF3< Kr < K2S3. CH3NH2< CHF3< K2S < CHCl3< Kr4. Kr < CH3NH2< CHF3< CHCl3< K2S016 10.0 pointsWhich of the foll owing is not a covalent net-work solid?1. glass2. diamondmcdonald (pam78654) – HW 5: Condensed Matter – laude – (89560) 43. cellulose4. table sugar5. starch6.
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