d. critical temperatures and pressures h|g CJ UVaJ h>* B*ph h>* j h>* B*Uph "j h|g h|g B*EHUph jh5(M Hence dipoledipole interactions, such as those in Figure \(\PageIndex{1b}\), are attractive intermolecular interactions, whereas those in Figure \(\PageIndex{1d}\) are repulsive intermolecular interactions. The combination of large bond dipoles and short dipoledipole distances results in very strong dipoledipole interactions called hydrogen bonds, as shown for ice in Figure \(\PageIndex{6}\). W h a t t y p e o f c h e m i c a l b o n d h o l d s t h e a t o m s t o g e t h e r w i t h i n a w a t e r m o l e c u l e ? Predict the melting and boiling points for methylamine (CH 3 NH 2). Although CH bonds are polar, they are only minimally polar. Ans:
Category:Medium Section:9.6
47. a. London-dispersion forces b. ion-dipole attraction c. dipole-dipole attractions d. ion-ion interactions e. none of the above, The predominant intermolecular force in (CH3)2NH is __________. Of the compounds that can act as hydrogen bond donors, identify those that also contain lone pairs of electrons, which allow them to be hydrogen bond acceptors. Butter is classified as a/an
A) metallic crystal. 5
2 4 . Because electrostatic interactions fall off rapidly with increasing distance between molecules, intermolecular interactions are most important for solids and liquids, where the molecules are close together. C.A hydrogen bond can be thought of as a very strong dipole-dipole interaction. %- %, ] %- %, %, %, 9 G" %, - 6. Which one of the following molecules has a non-zero dipole moment? The reason for this trend is that the strength of London dispersion forces is related to the ease with which the electron distribution in a given atom can be perturbed. c. They flow and are compressible. b. is highly viscous b. have highly ordered structures a. Ans:E Category:Medium Section:11.8
12. The molecules within the liquid are attracted to each other. The answer lies in the highly polar nature of the bonds between hydrogen and very electronegative elements such as O, N, and F. The large difference in electronegativity results in a large partial positive charge on hydrogen and a correspondingly large partial negative charge on the O, N, or F atom. There are two additional types of electrostatic interaction that you are already familiar with: the ionion interactions that are responsible for ionic bonding, and the iondipole interactions that occur when ionic substances dissolve in a polar substance such as water. d. not strong enough to keep molecules from moving past each other a. Viscosity b. Video Discussing Hydrogen Bonding Intermolecular Forces. Which one of the following molecules is polar? They are highly ordered and not compressible. A.Hydrogen bonds involve hydrogen bonded to carbon, nitrogen, oxygen, or fluorine. Because the electron distribution is more easily perturbed in large, heavy species than in small, light species, we say that heavier substances tend to be much more polarizable than lighter ones. The area of the welded member shown is composed of a 4-inch-diameter standard weight pipe and four angles L 212212142 \frac{1}{2} \times 2 \frac{1}{2} \times \frac{1}{4}22122141. 6 k J D ) 2 7 , 6 0 0 J E ) 2 5 , 0 0 0 k J
A n s : A C a t e g o r y : M e d i u m S e c t i o n : 1 1 . The most significant intermolecular force for this substance would be dispersion forces. Of the following, __________ should have the highest critical temperature. A) KF B) KI C) LiF D) LiI E) NaF
Ans:C Category:Medium Section:9.3
15. Ans: dispersion
Category:Medium Section:11.2
35. A . B R E E 4 2 C ) S 2 D ) E M B E D E q u a t i o n . A) SrO B) NaF C) CaBr2 D) CsI E) BaSO4
Ans:A Category:Medium Section:9.3
14. Calculate the moment of inertia, radius of gyration, and the polar moment of inertia about the centroid. m n x y ) * 4 5 ? B) trigonal planar. The force of attraction that exists between Na+ and H2O is called a(n) __________ interaction. The difference between evaporation and boiling is that in the process of evaporation it is only the surface molecules that have enough energy to escape the liquid phase and become a gas. These interactions become important for gases only at very high pressures, where they are responsible for the observed deviations from the ideal gas law at high pressures. A) HCl B) AsCl5 C) ICl D) NCl3 E) Cl2
Ans:B Category:Medium Section:9.9
39. e. melts rather than sublimes under ordinary conditions, Crystalline solids differ from amorphous solids in that crystalline solids have_____ ), { "11.01:_A_Molecular_Comparison_of_Gases_Liquids_and_Solids" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "11.02:_Intermolecular_Forces" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "11.03:_Some_Properties_of_Liquids" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "11.04:_Phase_Changes" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "11.05:_Vapor_Pressure" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "11.06:_Phase_Diagrams" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", 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Ans:B Category:Medium Section:11.8
22. Which of the following solids would have the highest melting point? h|g CJ UVaJ h>* B*ph j h>* B*Uph h' h>* H*h>* h h CJ$ aJ$ h>* CJ$ aJ$ @ c L | } , Ans:B Category:Easy Section:11.2
6. A) CO B) CH2Cl2 C) SO3 D) SO2 E) NH3
Ans:C Category:Medium Section:10.2
22. d. covalent-ionic interactions A) NH3 B) CCl4 C) CO2 D) SF4 E) PCl5
Ans:B Category:Medium Section:10.1
17. On average, however, the attractive interactions dominate. A) N2O B) CS2 C) PH3 D) CCl4 E) NO2
Ans:E Category:Medium Section:9.9
40. A) CO2 B) Cl2 C) ICl D) NO E) SO2
Ans:D Category:Medium Section:9.9
33. Draw the hydrogen-bonded structures. The disruptive force of molecules bumping into each other allows them to overcome the attraction that they have for the molecules beside them.
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which substance most likely has the highest boiling point quizlet
