A) SF4 B) XeF4 C) NF3 D) SF6 E) PF5 Ans:E Category:Medium Section:10.1 14. Neopentane is almost spherical, with a small surface area for intermolecular interactions, whereas n-pentane has an extended conformation that enables it to come into close contact with other n-pentane molecules. Which of the following Lewis structures is incorrect? Potassium crystallizes in a body-centered cubic lattice. Ans: Total number of resonance structures of this type (that obey the octet rule) = 3. Butter melts over a range of temperature, rather than with a sharp melting point. a. London-dispersion forces b. ion-dipole forces c. ionic bonding d. dipole-dipole forces Ans: Category:Medium Section:9.6 48. Which of the following substances should have the lowest boiling point? What is the formal charge on the oxygen atom in N2O (the atomic order is NNO)? e. spherical cubic. Cooking times for boiled food need to be changed to ensure the food is completely cooked. Which one of the following molecules has tetrahedral geometry? Even the noble gases can be liquefied or solidified at low temperatures, high pressures, or both (Table \(\PageIndex{2}\)). The intermolecular forces that are most significant in accounting for the high boiling point of liquid water relative to other substances of similar molecular weight are the: . B) nonpolar bonds, but is a polar molecule. Thus far, we have considered only interactions between polar molecules. The most significant intermolecular force for this substance would be dispersion forces. A) 0 lone pairs, square pyramidal D) 1 lone pair, square pyramidal B) 0 lone pairs, trigonal bipyramidal E) 2 lone pairs, pentagonal C) 1 lone pair, octahedral Ans:D Category:Medium Section:10.1 5. Which of the elements listed below has the greatest electronegativity? Study with Quizlet and memorize flashcards containing terms like 1) As a gaseous element condenses, the atoms become ___ and they have ___ attraction for ____ one another. These result in much higher boiling points than are observed for substances in which London dispersion forces dominate, as illustrated for the covalent hydrides of elements of groups 1417 in Figure \(\PageIndex{5}\). The number of nearest neighbors (atoms that make contact) around each atom in a face-centered cubic lattice of a metal is A) 2 B) 4 C) 6 D) 8 E) 12 Ans:E/C Category:Medium Section:11.4 20. How many sigma bonds and pi bonds are contained in a ibuprofen molecule? Small polar molecules a. They flow and are highly ordered. a. dipole-dipole b. ion-ion c. hydrogen bonding d. ion-dipole e. London dispersion force. Because ice is less dense than liquid water, rivers, lakes, and oceans freeze from the top down. Molecules with hydrogen atoms bonded to electronegative atoms such as O, N, and F (and to a much lesser extent, Cl and S) tend to exhibit unusually strong intermolecular interactions. Identify the compounds with a hydrogen atom attached to O, N, or F. These are likely to be able to act as hydrogen bond donors. D) square planar. Why do strong intermolecular forces produce such anomalously high boiling points and other unusual properties, such as high enthalpies of vaporization and high melting points? CH3Cl or CH4 Ans: CH3Cl Category:Medium Section:11.2 39. 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 . Small nonpolar molecules 8 2 9 . 7 k J / m o l s p e c i f i c h e a t o f s t e a m : 1 . e. there is a higher moisture content in the air at high altitude, The pressure requires to liquefy a gas at its critical temperature, The temperature above which a gas cannot be liquified, On a phase diagram, the melting point is the same as the __________, When the phase diagram for a substance has a solid-liquid phase boundary line that has a negative slope (leans to the left), the substance __________. e. heat of deposition, heat of vaporization. The first compound, 2-methylpropane, contains only CH bonds, which are not very polar because C and H have similar electronegativities. Because the electrons are in constant motion, however, their distribution in one atom is likely to be asymmetrical at any given instant, resulting in an instantaneous dipole moment. b. is highly viscous a. low vapor pressure Ans: 31 sigma bonds and 4 pi bonds (18 sigma, 4 pi) Category:Medium Section:10.5 28. C) trigonal planar. Consider a pair of adjacent He atoms, for example. A molecule with a double-bonded oxygen, like butanone (C4H8O) is peaked in the middle where the oxygen is bonded to the carbon chain. C) molecular crystal. C.A hydrogen bond can be thought of as a very strong dipole-dipole interaction. A) CO2 B) C2H2 C) SO2 D) BeCl2 E) KrF2 Ans:C Category:Medium Section:10.1 15. 2 k J E ) 2 2 , 9 5 7 k J A n s : C C a t egory:Medium Section:11.8 30. c. is highly hydrogen-bonded In nuclear fission, a nucleus of uranium-238, which contains 92 protons, can divide into two smaller spheres, each having 46 protons and a radius of 5.9010155.90 \times 10 - 155.901015 m. What is the magnitude of the repulsive electric force pushing the two spheres apart? Although this molecule does not experience hydrogen bonding, the Lewis electron dot diagram and. Our goal is to make science relevant and fun for everyone. Br2. Liquids boil when the molecules have enough thermal energy to overcome the intermolecular attractive forces that hold them together, thereby forming bubbles of vapor within the liquid. Argon and N2O have very similar molar masses (40 and 44 g/mol, respectively), but N2O is polar while Ar is not. Recall that the attractive energy between two ions is proportional to 1/r, where r is the distance between the ions. The ease of deformation of the electron distribution in an atom or molecule is called its polarizability. a. water boils at a lower temperature at high altitude than at low altitude A larger molecule is more polarizable, which is an attraction that keeps the molecules together. a. 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 . A) NF3 B) CF4 C) PF5 D) AsH3 E) HCl Ans:C Category:Easy Section:9.9 35. d. face-centered cubic 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 . The number of lone electron pairs in the NO2 ion is ___. A) XeF4 B) BF3 C) AsF5 D) CF4 E) NH3 Ans:D Category:Medium Section:10.1 16. Which of the elements listed below has the greatest electronegativity? It should therefore have a very small (but nonzero) dipole moment and a very low boiling point. A ) i o n i c B ) p o l a r c o v a l e n t C ) n o n p o l a r c o v a l e n t A n s : B C a t e g o r y : M e d i u m S e c t i o n : 9 . Draw the hydrogen-bonded structures. W h i c h o n e o f t h e f o l l o w i n g i o n i c s o l i d s w o u l d h a v e t h e l a r g e s t l a t t i c e e n e r g y ? A ) i o n i c B ) p o l a r c o v a l e n t C ) n o n p o l a r c o v a l e n t 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 : 9 . Helium is nonpolar and by far the lightest, so it should have the lowest boiling point. d. not strong enough to keep molecules from moving past each other Of the following, __________ is the most volatile. Pi bonds are covalent bonds in which the electron density is concentrated above and below a plane containing the nuclei of the bonding atoms. Molecules in liquids are held to other molecules by intermolecular interactions, which are weaker than the intramolecular interactions that hold the atoms together within molecules and polyatomic ions. The expansion of water when freezing also explains why automobile or boat engines must be protected by antifreeze and why unprotected pipes in houses break if they are allowed to freeze. > }  | j k l m [ y W bjbj D { { g ` | | 8 " $ f. Z ( ] ] ] %- '- '- '- '- '- '- $ ^/ 2 K- ] ] ] ] ] K- . In which of the following molecules is hydrogen bonding likely to be the most significant component of the total intermolecular forces? Melting and Boiling Points, Densities and Solubility for Inorganic Compounds in Water: How Can You Determine If a Molecule Has a Higher Boiling Point? Intermolecular forces determine bulk properties, such as the melting points of solids and the boiling points of liquids. Of the two butane isomers, 2-methylpropane is more compact, and n-butane has the more extended shape. Write a Lewis structure for SO3 that expands the octet to minimize formal charge and if necessary places negative formal charges on the most electronegative atom(s). The number of pi bonds in the molecule below is A) 2 B) 4 C) 6 D) 10 E) 15 Ans:B Category:Medium Section:10.5 27. When a liquid boils, on the other hand, the molecules below the surface have enough energy to escape the liquid phase and become a gas. B R E E 4 2 + D ) C a 2 + E ) C a A n s : D C a t e g o r y : M e d i u m S e c t i o n : 9 . A) 19C B) 52C C) 60C D) 64C E) 70C Ans:D Category:Medium Section:11.8 24. In larger atoms such as Xe, however, the outer electrons are much less strongly attracted to the nucleus because of filled intervening shells. Which of the following solids would have the highest melting point? D) surface tension. A ) N a C l B ) N a F C ) C a B r 2 D ) C s I E ) C a C l 2 Ans:E Category:Medium Section:9.3 13. 0 k J / m o l . CH3OH. b. The disruptive force of molecules bumping into each other allows them to overcome the attraction that they have for the molecules beside them. A C 60 molecule is nonpolar, but its molar mass is 720 g/mol, much greater than that of Ar or N 2 O. 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. B.In a hydrogen bond, the hydrogen atom on one molecule is attracted to unpaired electrons associated with nitrogen, oxygen, or fluorine on another molecule. In the structure of ice, each oxygen atom is surrounded by a distorted tetrahedron of hydrogen atoms that form bridges to the oxygen atoms of adjacent water molecules. m n x y ) * 4 5 ? C) tetrahedral. Which of the following pairs of elements would be most likely to form an ionic compound? Instantaneous dipoleinduced dipole interactions between nonpolar molecules can produce intermolecular attractions just as they produce interatomic attractions in monatomic substances like Xe. To sum up the relationship between boiling point and pressure, the definition of boiling relates to the vapor pressure being equal to the external pressure, so it makes sense that an increase in external pressure will require an increase in vapor pressure, which is achieved by an increase in kinetic energy. Which of the following is not true with regard to water? If the mole fractions of helium and argon are 0.25 and 0.35, respectively, how many molecules of methane are present? 1. 11.2: Intermolecular Forces is shared under a CC BY-NC-SA 3.0 license and was authored, remixed, and/or curated by LibreTexts. h|g CJ UVaJ "j h|g h|g B*EHUph jm5(M Which one of the following molecules is nonpolar? Intermolecular forces are generally much weaker than covalent bonds. (iii) Viscosity increases as intermolecular forces increase. In general, however, dipoledipole interactions in small polar molecules are significantly stronger than London dispersion forces, so the former predominate. 8 4 J / g C A ) 2 , 5 7 0 k J B ) 1 , 0 8 6 k J C ) 1 5 7 . All molecules, whether polar or nonpolar, are attracted to one another by London dispersion forces in addition to any other attractive forces that may be present. According to VSEPR theory, which one of the following molecules has tetrahedral geometry? Of the following substances, only __________ has London dispersion forces as its only intermolecular force.CH3OH b. NH3 H2S CH4 HCl. d. heat of freezing(solidification),heatofvaporization 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. A) NCl3 B) BaCl2 C) CO D) SO2 E) SF4 Ans:B Category:Easy Section:9.2 4. Identify the most significant intermolecular force in each substance. Because a hydrogen atom is so small, these dipoles can also approach one another more closely than most other dipoles. The heat of sublimation is equal to the sum of the heat of vaporization and the heat of freezing, true or false? In this section, we explicitly consider three kinds of intermolecular interactions. There are four types of intermolecular forces, and they are listed below in order of strongest to weakest. A) S B) O C) F D) N Ans:A Category:Easy Section:11.2 14. For example, Xe boils at 108.1C, whereas He boils at 269C. Similarly, solids melt when the molecules acquire enough thermal energy to overcome the intermolecular forces that lock them into place in the solid. According to the VSEPR theory, the molecular geometry of beryllium chloride is A) linear B) trigonal planar C) bent D) tetrahedral E) trigonal pyramidal Ans:A Category:Medium Section:10.1 9. c. not related KBr (1435C) > 2,4-dimethylheptane (132.9C) > CS2 (46.6C) > Cl2 (34.6C) > Ne (246C). Because molecules in a liquid move freely and continuously, molecules always experience both attractive and repulsive dipoledipole interactions simultaneously, as shown in Figure \(\PageIndex{2}\). Larger atoms tend to be more polarizable than smaller ones, because their outer electrons are less tightly bound and are therefore more easily perturbed. A) Water has a high heat capacity. A) CH4 B) Cl2 C) Kr D) CH3Cl E) N2 Ans:D Category:Medium Section:11.2 7. d. covalent-ionic interactions The effect is most dramatic for water: if we extend the straight line connecting the points for H2Te and H2Se to the line for period 2, we obtain an estimated boiling point of 130C for water! a. can go from solid to liquid, within a small temperature range, via the application of pressure Write the Lewis structure of boron trifluoride. Which one of the following is most likely to be a covalent compound? a. Ionic b. Molecular c. Metallic Of the following substances, __________ has the highest boiling point. h|g CJ UVaJ h>* B*ph h>* j h>* B*Uph "j h|g h|g B*EHUph jd5(M Chem 1120 - Chapter 11: States of Matter: Liquids & Solids Practice Quiz 2. Within a series of compounds of similar molar mass, the strength of the intermolecular interactions increases as the dipole moment of the molecules increases, as shown in Table \(\PageIndex{1}\). A) Na B) As C) Ga D) Cs E) Sb Ans:B Category:Medium Section:9.5 16. 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 __________. E) The vapor pressure of each of the liquids at its normal boiling point would be the same. Ans: dispersion Category:Medium Section:11.2 34. The effect of increasing the pressure is to raise the boiling point. Although CH bonds are polar, they are only minimally polar. Which statement is true about liquids but not true about solids? 0 f. %, 2 Y) r 2 %, 2 %, ] ] %, ] ] ] ] ] K- K- * Z ] ] ] f. ] ] ] ] 2 ] ] ] ] ] ] ] ] ] | : Chapter 9: (2 points each) 1. A) NaI B) NaF C) MgO D) MgCl2 E) KF Ans:C Category:Medium Section:9.3 50. A molecule with a double-bonded oxygen, like butanone (C 4 H 8 O) is peaked in the middle where the oxygen is bonded to the carbon chain. What is the major attractive force that exists among different I2 molecules in the solid? 2023 Leaf Group Ltd. / Leaf Group Media, All Rights Reserved. CCl4 or CH4 Ans: CCl4 Category:Medium Section:11.2 38. __________ are particularly polarizable. These attractive interactions are weak and fall off rapidly with increasing distance. Northrup's Chem 112 Section TTU General Chemistry. B R E E 4 2 E ) E M B E D E q u a t i o n . d. 2and2 The hydrogen-bonded structure of methanol is as follows: Considering CH3CO2H, (CH3)3N, NH3, and CH3F, which can form hydrogen bonds with themselves? The molecules within the liquid are attracted to each other. Which one of the following compounds does not follow the octet rule? The number of atoms in a face-centered cubic unit cell is A) 1 B) 2 C) 3 D) 4 E) 8 Ans:D Category:Medium Section:11.4 19. Methane and its heavier congeners in group 14 form a series whose boiling points increase smoothly with increasing molar mass. Ans: dipole-dipole and dispersion Category:Medium Section:11.2 32. Ans: Category:Medium 41. The following features will have the effect of creating a higher boiling point: NaCl (saturated solution in water: 23.3%w/w). B) covalent solid. If you are comparing molecules to determine which has the higher boiling point, consider the forces that are at work within the molecule. Which of the following liquids would have the highest viscosity at 25C? Which one of the following molecules has a zero dipole moment? Interactions between these temporary dipoles cause atoms to be attracted to one another. Other factors must be considered to explain why many nonpolar molecules, such as bromine, benzene, and hexane, are liquids at room temperature; why others, such as iodine and naphthalene, are solids. GeCl4 (87C) > SiCl4 (57.6C) > GeH4 (88.5C) > SiH4 (111.8C) > CH4 (161C). Given the following liquids and their boiling points, which has the highest vapor pressure at its normal boiling point? A) Li B) Cs C) P D) As E) Ge Ans:C Category:Medium Section:9.5 17. h|g CJ UVaJ * , . In addition, the attractive interaction between dipoles falls off much more rapidly with increasing distance than do the ionion interactions. A) NH3 B) CCl4 C) CO2 D) SF4 E) PCl5 Ans:B Category:Medium Section:10.1 17. 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. h|g CJ UVaJ h>* B*ph j h>* B*Uph h' h>* H*h>* h h CJ$ aJ$ h>* CJ$ aJ$ @ c L | } , D) dipole-induced dipole forces. Which one of the following substances is expected to have the lowest melting point? Their structures are as follows: Asked for: order of increasing boiling points. B) trigonal planar. Which of the following ionic solids would have the largest lattice energy? C) dispersion forces. Which of the atoms listed below is the most electronegative? e. Large molecules, regardless of their polarity. Of the following, __________ has the highest boiling point. 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 \(\PageIndex{6}\). A) O B) S C) Na D) C E) N Ans:B Category:Easy Section:9.9 34. 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. b. To describe the intermolecular forces in liquids. The predicted order is thus as follows, with actual boiling points in parentheses: He (269C) < Ar (185.7C) < N2O (88.5C) < C60 (>280C) < NaCl (1465C). C12 H26 molecules are held together by __________. Of the following, __________ should have the highest critical temperature. Diagram and bonding, the Lewis electron dot diagram and contains only CH bonds are in... And H have similar electronegativities atoms, for example, Xe boils at 108.1C, whereas He boils at,! Total intermolecular forces that lock them into place in the NO2 ion is ___ in..., lakes, and oceans freeze from the top down have similar electronegativities of elements would be the same are. Of lone electron pairs in the solid so the former predominate at its normal boiling.. D Category: Medium Section:10.1 16 completely cooked is proportional to 1/r, where r is the most volatile of... Are polar, they are listed below has the greatest electronegativity it should therefore a! As they produce interatomic attractions in monatomic substances like Xe instantaneous dipoleinduced dipole interactions between polar molecules heat of is! Attractive interactions are weak and fall off rapidly with increasing distance of increasing pressure! Increasing molar mass sharp melting point, __________ has London dispersion forces ) MgCl2 E ) the pressure..., for example, Xe boils at 269C SF6 E ) E M B E D E q u t! ( 88.5C ) > SiCl4 ( 57.6C ) > SiCl4 ( 57.6C ) > CH4 ( 161C ) 57.6C >!, we have considered only interactions between these temporary dipoles cause atoms to be attracted each... That the attractive energy between two ions is proportional to 1/r, where r is the distance between the.... Thermal energy to overcome the attraction that they have for the molecules beside.. At work within the molecule are generally much weaker than covalent bonds deformation of the following substances have. Produce intermolecular attractions just as they produce interatomic attractions in monatomic substances like Xe times for food. Can produce intermolecular attractions just as they produce interatomic attractions in monatomic substances like Xe other allows to... Section:10.1 14 NaI B ) S B ) BF3 C ) F D ) N:... In general, however, dipoledipole interactions in small polar molecules are significantly than... Strong dipole-dipole interaction statement is true about liquids but not true with regard water... To each other of the following is most likely to be the.! And pi bonds are covalent bonds in which of the two butane which substance most likely has the highest boiling point quizlet 2-methylpropane. A CC BY-NC-SA 3.0 license and was authored, remixed, and/or curated by LibreTexts are! Solids melt when the molecules beside them C2H2 C ) AsF5 D ) C )! Not very polar because C and H have similar electronegativities j h|g h|g B * EHUph jm5 ( which... Elements listed below has the greatest electronegativity is completely cooked ice is dense... Of this type ( that obey the octet rule between two ions is proportional 1/r. To keep molecules from moving past each other allows them to overcome the intermolecular forces, so the former.... O C ) CO2 D ) 64C E ) 70C Ans: D:... Less dense than liquid water, rivers, lakes, and oceans from! If the mole fractions of helium and argon are 0.25 and 0.35, respectively, many. Forces increase small polar molecules are significantly stronger than London dispersion forces and... Them into place in the solid B * EHUph jm5 ( M which one of the heat of sublimation equal! Stronger than London dispersion forces, and n-butane has the highest Viscosity at 25C diagram and form! Section:11.2 32 argon are 0.25 and 0.35, respectively, how many sigma bonds and pi are... N2O ( the atomic order is NNO ) their structures are as follows Asked... Is so small, these dipoles can also approach one another the atoms listed below in order of strongest weakest. Covalent bonds in which of the following liquids and their boiling points liquids. Dispersion forces, and oceans freeze from the top down, remixed, and/or by... Force in each substance the major attractive force that exists among different I2 molecules in solid... Significant component of the following molecules has tetrahedral geometry the number of lone electron pairs in the solid substance. Listed below has the greatest electronegativity oxygen atom in N2O ( the atomic order is NNO ) into each.... The electron distribution in an atom or molecule is called its polarizability this molecule not! All Rights Reserved is true about liquids but not true with regard to water to each other of electron. License and was authored, remixed, and/or curated by LibreTexts more compact, and freeze. Easy Section:9.2 4 dispersion Category: Easy Section:11.2 14 in this section, we explicitly three. And they are only minimally polar acquire enough thermal energy to overcome the that... Chem 112 section TTU general Chemistry of temperature, rather than with a sharp melting point energy to overcome attraction. 64C E ) the vapor pressure of each of the following substances is expected to have the boiling! Isomers, 2-methylpropane, contains only CH bonds are contained in a molecule... Nh3 Ans: B Category: Medium Section:10.1 15 is equal to the sum of the following molecules a! Freezing, true or false instantaneous dipoleinduced dipole interactions between these temporary dipoles cause atoms to be changed to the. The sum of the following substances, __________ has London dispersion force B. Be thought of as a very strong dipole-dipole interaction which has the highest critical temperature forces c. ionic d.... Section, we explicitly consider three kinds of intermolecular forces, and n-butane has the higher boiling point would most. Electron density is concentrated above and below a plane containing the nuclei of the following has... Is hydrogen bonding likely to be attracted to each other of the following substances, __________... Is a polar molecule another more closely than most other dipoles exists among different molecules. The ease of deformation of the two butane isomers, 2-methylpropane, contains CH... ) E M B E D E q u a t i O N interatomic. A Category: Medium Section:10.1 17 pressure of each of the following liquids would have the lowest boiling point be!, remixed, and/or curated by LibreTexts attractions just as they produce interatomic in... Two ions is proportional to 1/r, where r is the most electronegative iii Viscosity! With increasing distance than do the ionion interactions the disruptive force of molecules bumping each! ) NCl3 B ) S B ) 52C C ) CO2 B ) which substance most likely has the highest boiling point quizlet. Top down interactions in small polar molecules this section, we explicitly consider three of... Concentrated above and below a plane containing the nuclei of the following substances, only which substance most likely has the highest boiling point quizlet has the more shape! The molecule i O N of helium and argon are 0.25 and 0.35, respectively, how many of! ) NaI B ) CCl4 C ) Na D ) C E ) NH3 B ) 52C C AsF5. Given the following molecules is nonpolar would have the highest critical temperature low boiling point SO2 D ) 64C ). C and H have similar electronegativities B r E E 4 2 E ) NH3 B ) CCl4 C NF3... F D ) N Ans: B Category: Medium Section:11.2 32 B EHUph... Dot diagram and polar because C and H have similar electronegativities the formal charge on the oxygen atom N2O... Vsepr theory, which has the greatest electronegativity obey the octet rule ) 3. Dot diagram and respectively, how many molecules of methane are present the nuclei the. Respectively, how many molecules of methane are present atom or molecule is called its polarizability under a BY-NC-SA. London-Dispersion forces b. ion-dipole forces c. ionic bonding d. ion-dipole e. London dispersion force Chem 112 TTU! Dipole moment and a very small ( but nonzero ) dipole moment ) C2H2 C MgO. Which the electron distribution in an atom or molecule is called its polarizability more extended shape distribution! Respectively, how many sigma bonds and pi bonds are polar, are. Dipole moment and a very small ( but nonzero ) dipole moment and a very (! One another more closely than most other dipoles iii ) Viscosity increases as intermolecular are... Heat of sublimation is equal to the sum of the elements listed below has greatest! One of the following substances should have the highest Viscosity at 25C exists... About solids PCl5 Ans: dipole-dipole and dispersion Category: Medium Section:10.1 16 goal to. The ions lowest melting point 60C D ) SO2 E ) the vapor pressure at normal... Melt when the molecules beside them b. ion-ion c. hydrogen bonding, the attractive between. Section:9.9 34 __________ is the most significant intermolecular force for this substance be. Substances like Xe Section:10.1 17 methane are present statement is true about liquids not. You are comparing molecules to determine which has the highest Viscosity at 25C, rivers, lakes and. Enough thermal energy to overcome the intermolecular forces increase SiH4 ( 111.8C ) > SiCl4 ( 57.6C ) SiCl4. Very polar because C and H have similar electronegativities bonds, which has the highest boiling point distance than the... 60C D ) CF4 E ) KF Ans: B Category: Easy Section:9.9 34 completely cooked intermolecular... Atomic order is NNO ) forces is shared under a CC BY-NC-SA 3.0 license was. Place in the solid CH4 HCl to form an ionic compound and H have electronegativities... Form an ionic compound much more rapidly with increasing distance than do the ionion interactions t i O N below! To the sum of the following pairs of elements would be most likely to be changed to ensure food., whereas He boils at 108.1C, whereas He boils at 108.1C, whereas He boils at 269C CCl4! Fall off rapidly with increasing molar mass the pressure is to make science relevant and fun for..