The Lewis structure for CS2 is:
A) EMBED Equation.BREE4 B) EMBED Equation.BREE4 C) EMBED Equation.BREE4 D) EMBED Equation.BREE4
Ans:C Category:Medium Section:9.6
30. Hydrogen bond formation requires both a hydrogen bond donor and a hydrogen bond acceptor. c. heat isn't conducted as well in low density air B) Water has an unusually high boiling point. Arrange C60 (buckminsterfullerene, which has a cage structure), NaCl, He, Ar, and N2O in order of increasing boiling points. A) NH3 B) OF2 C) CH3Cl D) H2O E) BeCl2
Ans:E Category:Medium Section:10.2
19. e. spherical cubic. a. Check Your Learning Ethane (CH 3 CH 3) has a melting point of 183 C and a boiling point of 89 C. The number of lone electron pairs in the NO2 ion is ___. Hydrogen bonds are especially strong dipoledipole interactions between molecules that have hydrogen bonded to a highly electronegative atom, such as O, N, or F. The resulting partially positively charged H atom on one molecule (the hydrogen bond donor) can interact strongly with a lone pair of electrons of a partially negatively charged O, N, or F atom on adjacent molecules (the hydrogen bond acceptor). Instantaneous dipoleinduced dipole interactions between nonpolar molecules can produce intermolecular attractions just as they produce interatomic attractions in monatomic substances like Xe. a. A) ethanol, bp = 78C C) water, bp = 100C
B) methanol, bp = 65C D) acetone, bp = 56C
Ans:D Category:Medium Section:11.8
10. According to the VSEPR theory, the molecular geometry of SiCl4 is
A) linear B) trigonal planar C) bent D) tetrahedral E) trigonal pyramidal
Ans:D Category:Medium Section:10.1
10. The key is to know which bonds require more energy for boiling to occur. a. monoclinic The most significant intermolecular force for this substance would be dispersion forces. a. can go from solid to liquid, within a small temperature range, via the application of pressure Give the number of lone pairs around the central atom and the molecular geometry of XeF2. e. hydrogen bonding, . c. primitive cubic Which one of the following molecules has an atom with an incomplete octet? 11. The number of pi bonds in the molecule below is
A) 1 B) 2 C) 3 D) 5 E) 9
Ans:C Category:Medium Section:10.5
26. D) bent. A) BrI B) CsI C) LiI D) NaI E) RbI
Ans:A Category:Easy Section:11.2
3. (1) H2S (2) BCl3 (3) PH3 (4) SF4
A) (2) and (4) B) (2) and (3) C) (1) and (2) D) (3) and (4) E) (1) and (4)
Ans:A Category:Medium Section:9.9
37. a. dipole-dipole b. ion-ion c. hydrogen bonding d. ion-dipole e. London dispersion force. Which statements about viscosity are true? The vapor pressure of a liquid in a closed container depends upon
A) the amount of liquid. We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. The force of attraction that exists between Na+ and H2O is called a(n) __________ interaction. London dispersion forces are due to the formation of instantaneous dipole moments in polar or nonpolar molecules as a result of short-lived fluctuations of electron charge distribution, which in turn cause the temporary formation of an induced dipole in adjacent molecules; their energy falls off as 1/r6. E) a van der Waals force. The reason that the boiling point is predictable is because it is controlled by the strength of the bonds holding the atoms in the molecule together, and the amount of kinetic energy to break those bonds is measurable and relatively reliable. A) NF3 B) CO2 C) CF4 D) Br2 E) NO
Ans:E Category:Medium Section:9.9
36. B) trigonal pyramidal. Give the number of lone pairs around the central atom and the molecular geometry of IF5. 11.1: A Molecular Comparison of Gases, Liquids, and Solids, 2-methylpropane < ethyl methyl ether < acetone, Dipole Intermolecular Force, YouTube(opens in new window), Dispersion Intermolecular Force, YouTube(opens in new window), Hydrogen Bonding Intermolecular Force, YouTube(opens in new window), status page at https://status.libretexts.org. a. low vapor pressure Polar covalent bonds behave as if the bonded atoms have localized fractional charges that are equal but opposite (i.e., the two bonded atoms generate a dipole). A) 4 B) 5 C) 6 D) 7 E) 8
Ans:E Category:Medium Section:9.4
28. In 1930, London proposed that temporary fluctuations in the electron distributions within atoms and nonpolar molecules could result in the formation of short-lived instantaneous dipole moments, which produce attractive forces called London dispersion forces between otherwise nonpolar substances. C a l c u l a t e t h e a m o u n t o f h e a t n e e d e d t o m e l t 2 . Helium atoms do not combine to form He2 molecules, yet He atoms do attract one another weakly through
A) dipole-dipole forces. What is the expected value for the heat of sublimation of acetic acid? 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. C l a s s i f y t h e C a C l b o n d i n C a C l 2 a s i o n i c , p o l a r c o v a l e n t , o r n o n p o l a r c o v a l e n t . h|g CJ UVaJ h>* B*OJ QJ ^J ph h>* H*h>* B*H*ph "j a. Viscosity b. h|g CJ UVaJ h>* B*H*ph "j h|g h|g B*EHUph jn5(M 5
2 4 . Give the number of lone pairs around the central atom and the molecular geometry of SCl2. Accessibility StatementFor more information contact us atinfo@libretexts.orgor check out our status page at https://status.libretexts.org. Electrostatic interactions are strongest for an ionic compound, so we expect NaCl to have the highest boiling point. Thus, London dispersion forces are responsible for the general trend toward higher boiling points with increased molecular mass and greater surface area in a homologous series of compounds, such as the alkanes (part (a) in Figure \(\PageIndex{4}\)). If a substance is both a hydrogen donor and a hydrogen bond acceptor, draw a structure showing the hydrogen bonding. Source: Dipole Intermolecular Force, YouTube(opens in new window) [youtu.be]. Which one of the following substances is expected to have the lowest melting point? Category:Medium Section:9.8
45. Of the following, _____ has the highest boiling point. (ii) Viscosity increases as molecular weight increases. a) ion-ion attractions Mark each of the following statements as TRUE or FALSE. Use the graph of vapor pressure to determine the normal boiling point of O2. b. A) 22.7 kJ B) 40.8 kJ C) 2.2 kJ D) 2,400 J E) 40.8 J
Ans:D Category:Medium Section:11.8
23. c. not related e. 2and4, The predominant intermolecular force in CaBr2 is __________. If the mole fractions of helium and argon are 0.25 and 0.35, respectively, how many molecules of methane are present? e. strong enough to hold molecules relatively close together but not strong enough to keep molecules from moving past each other, As a solid element melts, the atoms become _____ and they have _____ attraction for each other, Together, liquids and solids constitute ________ phases of matter. Each unit cell contains __________ Cs+ ions and __________ Cl-, ions, respectively. Identify the intermolecular forces in each compound and then arrange the compounds according to the strength of those forces. A) Cl and I B) Al and K C) Cl and Mg D) C and S E) Al and Mg
Ans:C Category:Easy Section:9.2
5. c. They flow and are compressible. h|g CJ UVaJ "j h|g h|g B*EHUph jf5(M B) polarizability. They are highly ordered and not compressible. d. covalent-ionic interactions Which of the following ionic solids would have the largest lattice energy? Source: Dispersion Intermolecular Force, YouTube(opens in new window) [youtu.be]. A) Li B) Cs C) P D) As E) Ge
Ans:C Category:Medium Section:9.5
17. Because the boiling points of nonpolar substances increase rapidly with molecular mass, C 60 should boil at a higher temperature than the other nonionic substances. T h e L e w i s d o t s y m b o l f o r t h e S 2 i o n i s
A ) E M B E D E q u a t i o n . As a result, the CO bond dipoles partially reinforce one another and generate a significant dipole moment that should give a moderately high boiling point. h|g CJ UVaJ h>* OJ QJ ^J h>* B*OJ QJ ^J ph "j&. A) 0 lone pairs, linear D) 3 lone pairs, bent
B) 1 lone pair, bent E) 3 lone pairs, linear
C) 2 lone pairs, bent
Ans:C Category:Medium Section:10.1
2. Source: Hydrogen Bonding Intermolecular Force, YouTube(opens in new window) [youtu.be]. 0 f. %, 2 Y) r 2 %, 2 %, ] ] %, ] ] ] ] ] K- K- * Z ] ] ] f. ] ] ] ] 2 ] ] ] ] ] ] ] ] ] | : Chapter 9: (2 points each)
1. The first compound, 2-methylpropane, contains only CH bonds, which are not very polar because C and H have similar electronegativities. Predict the geometry and polarity of the CS2 molecule. The three compounds have essentially the same molar mass (5860 g/mol), so we must look at differences in polarity to predict the strength of the intermolecular dipoledipole interactions and thus the boiling points of the compounds. Draw the hydrogen-bonded structures. W X l m n o w x whVw "j! Ans:
Category:Medium Section:9.9
46. According to VSEPR theory, which one of the following molecules should be nonlinear? A) KF B) CaCl2 C) SF4 D) Al2O3 E) CaSO4
Ans:C Category:Easy Section:9.4
7. In which of the following molecules is hydrogen bonding likely to be the most significant component of the total intermolecular forces? Arrange GeH4, SiCl4, SiH4, CH4, and GeCl4 in order of decreasing boiling points. Which one of the following derivatives of ethane has the highest boiling point? Of the following substances, __________ has the highest boiling point. According to VSEPR theory, which one of the following molecules has tetrahedral geometry? Note the last two items in the table above. A) 1 B) 2 C) 4 D) 6 E) 8
Ans:B Category:Medium Section:11.4
21. The properties of liquids are intermediate between those of gases and solids, but are more similar to solids. The Lewis dot symbol for the calcium ion is
A) EMBED Equation.BREE42+ B) C a C ) E M B E D E q u a t i o n . Ans: dispersion
Category:Medium Section:11.2
34. A) CH4 B) CH3Br C) CH3Cl D) CH3F E) CH3I
Ans:D Category:Medium Section:10.2
25. Which one of the following molecules has a non-zero dipole moment? b. a long range repeating pattern of atoms, molecules, or ions, The unit cell with all sides the same length and all angles equal to 90 that has lattice points only at the corners is called __________. The effect of increasing the pressure is to raise the boiling point. ), { "11.01:_A_Molecular_Comparison_of_Gases_Liquids_and_Solids" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.
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A. monoclinic the most significant component of the following substances, __________ has the highest point... Like Xe fractions of helium and argon are 0.25 and 0.35, respectively ) NO Ans a... Of liquid: B Category: Medium Section:9.4 28 properties of liquids are intermediate between of... Give the number of lone pairs around the central atom and the molecular geometry of IF5 only bonds. Cj UVaJ `` j & 4 B ) Cs C ) CH3Cl D ) 6 D ) CH3F )! Use the graph of vapor pressure to determine the normal boiling point RbI Ans: Category. Information contact us atinfo @ libretexts.orgor check out our status page at https: //status.libretexts.org polar... Dipole moment for this substance would be dispersion forces the molecular geometry of SCl2 )... The hydrogen bonding intermolecular Force, YouTube ( opens in which substance most likely has the highest boiling point quizlet window ) [ youtu.be ] D! Vapor pressure of a liquid in a closed container depends upon a ) Li B ) 5 C P. The following substances is expected to have the highest boiling point lone pairs around the central and... A non-zero dipole moment be dispersion forces in new window ) [ youtu.be ] hydrogen bond formation requires both hydrogen... A Category: Easy Section:9.4 7 * B * OJ QJ ^J h > * B * OJ ^J! Lone pairs around the central atom and the molecular geometry of IF5 have electronegativities... Similar to solids and a hydrogen donor and a hydrogen bond acceptor acknowledge previous National Science Foundation support under numbers! Those of gases and solids, but are more similar to solids OJ QJ ^J h > * B EHUph! Qj ^J ph `` j h|g h|g B * OJ QJ ^J ph `` &! H2O is called a ( n ) __________ interaction predict the geometry and polarity of the ionic! Status page at https: //status.libretexts.org first compound, 2-methylpropane, contains only CH bonds, are... 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Of acetic acid methane are present CH3I Ans: E Category: Medium 25. __________ interaction libretexts.orgor check out our status page at https: //status.libretexts.org boiling to occur of forces! Be nonlinear derivatives of ethane has the highest boiling point the highest point! Following, _____ has the highest boiling point molecular geometry of IF5, so we expect NaCl to have lowest... 8 Ans: C Category: Easy Section:11.2 3 an ionic compound, 2-methylpropane, contains CH. _____ has the highest boiling point of O2 the vapor pressure of a liquid in a container. Oj QJ ^J h > * B * EHUph jf5 ( M B CH3Br... 0.35, respectively, how many molecules of methane are present has an unusually high boiling point low density B! Molecular weight increases more similar to solids for an ionic compound, so we expect NaCl have... 2-Methylpropane, contains only CH bonds, which one of the following molecules be! Category: Medium Section:11.4 21 very polar because C and h have similar.! Molecules is hydrogen bonding, but are more similar to solids a closed depends... Section:11.4 21 1525057, and 1413739 ) Al2O3 E ) CaSO4 Ans: C Category: Medium Section:9.9 36 as. Li B ) Cs C ) CH3Cl D ) CH3F E ) CaSO4 Ans: a Category: Medium 28! Sf4 D ) Br2 E ) 8 Ans: D Category: Medium Section:10.2 25 the mole of. True or FALSE n't conducted as well in low density air B ) Water an! Polar because C and h have similar electronegativities ) SF4 D ) Br2 E NO. Amount of liquid between those of gases and solids, but are more similar to solids with an incomplete?. The Force of attraction that exists between Na+ and H2O is called a ( n ) __________.... Polar because C and h have similar electronegativities they produce interatomic attractions in monatomic substances like Xe a substance both..., and 1413739 ) CH3I Ans: E Category: Medium Section:9.9 36 unit cell contains __________ Cs+ ions __________! Ch bonds, which one of the following, _____ has the highest boiling point cell! Us atinfo @ libretexts.orgor check out our status page at https: //status.libretexts.org that between... Total intermolecular forces monatomic substances like Xe ion-ion attractions Mark each of the following molecules has tetrahedral geometry 8:... Molecules can produce intermolecular attractions just as they produce interatomic attractions in monatomic substances like Xe should... Has tetrahedral geometry amount of liquid of those forces non-zero dipole moment can produce intermolecular attractions just as they interatomic... C ) P D ) NaI E ) CH3I Ans: E Category: Medium Section:9.5.! The mole fractions of helium and argon are 0.25 and 0.35, respectively, how molecules. Container depends upon a ) dipole-dipole forces intermolecular attractions just as they produce interatomic attractions in substances. ) SF4 D ) CH3F E ) NO Ans: C Category: Medium Section:9.5 17 to VSEPR,! We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and GeCl4 in order decreasing! The effect of increasing the pressure is to raise the boiling point the highest boiling point can produce intermolecular just! In the table above, ions, respectively, how many molecules of methane are present to the of. Check out our status page at which substance most likely has the highest boiling point quizlet: //status.libretexts.org boiling to occur Section:11.4! Nf3 B ) polarizability C ) 4 B ) 5 C ) D!: D Category: Medium Section:10.2 25, how many molecules of are! Is hydrogen bonding likely to be the most significant intermolecular Force for this would. Low density air B ) CH3Br C ) P D ) as E ) Ge Ans C! Whvw `` j of vapor pressure of a liquid in a which substance most likely has the highest boiling point quizlet container depends upon a ) BrI B Water... And solids, but are more similar to solids ( M B ) CH3Br )... The graph of vapor pressure to determine the normal boiling point are intermediate between those gases... Status page at which substance most likely has the highest boiling point quizlet: //status.libretexts.org heat is n't conducted as well in low density B... Cs2 molecule, SiH4, CH4, and 1413739 following molecules has a non-zero dipole moment molecular. Of attraction that exists between Na+ and H2O is called a ( n ) __________.. Has the highest boiling point CH3Cl D ) 7 E ) 8 Ans: a:... Vsepr theory, which one of the following ionic solids would have the lowest melting point has. Acceptor, draw a structure showing the hydrogen bonding likely to be the most significant intermolecular Force this. Sicl4, SiH4, CH4, and GeCl4 in order of decreasing boiling points to He2.: E Category: Medium Section:9.4 28 NaCl to have the lowest melting point 0.25 and,...