5 A and B only vu ttv269 Lecture 16 Introduction to Intermolecular Forces laude

5 a and b only vu ttv269 lecture 16 introduction to

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5.A and B only
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vu (ttv269) – Lecture 16 - Introduction to Intermolecular Forces – laude – (50990)56.A and D only7.C and D onlycorrect8.None has dipole-dipole interactions.9.B and D onlyExplanation:O2and CO2do not have dipole moments.O3and SO2are both bent molecules and ex-hibit dipoles because of their uneven electrondistributions.01610.0pointsWhy is I2a solid while H2is a gas?1.I2is less polarizable than H2.2.I2is more polarizable than H2.correct3.I2has a smaller dipole than H2.4.I2has a larger dipole than H2.5.H2has hydrogen bonds.Explanation:I2has significantly more electrons than H2.In addition, those electrons are in orbitalsthat are significantly farther from the nu-cleus, making it easier to distort the electroncloud.Higher polarizability leads to higherLondon dispersion forces.Neither moleculehas a dipole nor H-bonds.01710.0pointsWhich of the following forces is responsiblefor the intermolecular attraction in liquid ni-trogen (N2)?1.hydrogen bonding2.dispersion or van der Waals forcescor-rect3.ionic4.dipole-dipoleExplanation:01810.0pointsWhich of the following moleculesA) CH3OCH3C) CH3CHOB) CH3CH2OHD) CH3COOHare likely to form hydrogen bonds?1.Another combination of compounds2.B and D onlycorrect3.None forms hydrogen bonds.4.A and D only5.A and C only6.B and C only7.A and B only8.C and D only9.All are likely to form hydrogen bonds.Explanation:Only molecules with H attached to theelectronegative atoms N, O, and F can hy-drogen bond.Of the molecules given, onlyCH3COOH and CH3CH2OH have hydrogenattached to oxygen, so these are the only onesthat can undergo hydrogen bonding.01910.0pointsThe anomalous physical properties of watercan be attributed to1.the open network structure of ice.2.its relatively low molecular weight.3.strong hydrogen-bonding intermolecularforces.correct4.its large dipole moment.5.its relatively high density.Explanation:
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vu (ttv269) – Lecture 16 - Introduction to Intermolecular Forces – laude – (50990)6Water is a polar molecule but it is thestrong H-bonding intermolecular interactionbetween H2O molecules that causes them tobe difficult to separate. This manifests itselfin water posessing a high specific heat capac-ity, high melting and boiling points and (to-gether with the orientation of the O-H bondsin the H2O molecule) the open cagelike struc-ture of ice.02010.0pointsWhich of the following species is incorrectlypaired with its strongest type of intermolecu-lar force?1.NaCl (table salt), ionic bonding2.C6H6(benzene), dispersion forces3.N2H4(hydrazine), hydrogen bonding4.O3(ozone), dispersion forcescorrectExplanation:Ozone is polar and has dipole-dipole inter-actions.02110.0pointsRank the following molecules in order of in-creasing intermolecular forces:C2H2,H2,C(CH3)4, N2.1.H2<C2H2<N2<C(CH3)4correct2.H2<N2<C2H2<C(CH3)43.N2<H2<C2H2<C(CH3)44.C2H2<H2<N2<C(CH3)45.H2<N2<C(CH3)4<C2H2Explanation:All of the molecules are nonpolar and haveonly instantaneous dipole forces.Instanta-neous dipole forces increase with molecularweight.
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  • Fall '10
  • McCord
  • Chemistry, Mole, Intermolecular force, Van der Waals force

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