Chapter 9 1 Which of the following are correct statements about the valence shell electron pair repulsion VSEPR model of bonding 1 2 3 A B C D E 2 1 only 2 only 3 only 1 2 and 3 None of the above Which of the following is non planar A B C D E 3 Electron pairs orient themselves to give the smallest angles possible Only bonding electron pairs are important in the VSEPR model Electron pair geometry in all cases describes the spatial geometry of the atoms in the molecule SO2 SO3 SO42 NO3 BF3 The number of bonding pairs of electrons non bonding pairs of electrons and molecular shape of the H3O ion are Bonding Pairs Non bonding Pairs Molecular Shape A 4 0 tetrahedral B 3 1 tetrahedral C 2 2 bent D 3 1 trigonal pyramidal E 3 0 trigonal planar 4 Among the following gaseous molecules BeF2 BF3 CF4 NF3 OF2 What is the correct trend in FMF bond angle LARGEST 5 A BeF2 BF3 CF4 NF3 OF2 B BeF2 OF2 CF4 BF3 NF3 C BeF2 OF2 BF3 NF3 CF4 D BeF2 BF3 OF2 NF3 CF4 E CF4 NF3 BeF2 OF2 A B C D E CO32 SOCl2 H3O SO32 1 only 1 2 and 3 1 and 3 1 3 and 4 3 and 4 Which of the following molecules and ions possesses a tetrahedral molecular structure A B C D E 7 BF3 Which of the following molecules has a trigonal planar structure 1 2 3 4 6 SMALLEST TeI4 SeBr4 XeCl4 NH3 AlF4 The bond angles in H2O2 are approximately A B C D E 90 105 109 5 120 180 8 Identify which of the following bonds is are polar and which element in each is the more electronegative HCl NO Si2 Now consider these five statements about your conclusions 1 2 3 4 5 HCl is polar with H the more electronegative HCl is polar with the Cl the more electronegative NO is polar with the N the more electronegative NO is polar with O the more electronegative Si2 is polar The correct statement s above is are A B C D E 9 2 only 2 and 3 only 2 and 4 only 2 3 and 5 only 1 and 4 only Consider the following molecules 1 BF3 2 NH3 3 SOCl2 4 SiF4 Which of these should have a dipole moment A B C D E 2 only 2 3 and 4 only 1 2 and 3 ony 1 and 4 only 2 and 3 only 10 Which of the following molecules has the largest dipole moment A B C D E XeF2 XeF4 PF5 SF4 SF6 11 Which of the following benzene like molecules do you expect to have the largest dipole moment F Cl F A F Cl F F H H F F B H Cl H H C H H Cl H H F D H F H H H F E H H F 12 Which of the following statements is true A There are two bonds in H C H C H H B The H N H angle in NH3 is slightly larger than the H C H angle in CH4 C In CO2 the carbon is sp2 hybridized D The molecule below possesses a dipole moment Cl C C H H C l is true E None of the above statements 13 Which of the following is a correct set of electron pair geometry hybridization and bond angle s Geometry Hybridization Bond Angle s A linear sp2 180 B trigonal planar sp2 120 C octahedral d2sp3 60 D tetrahedral dsp3 109 5 E trigonal bipyramidal d2sp3 120 90 14 Of the following statements about delocalized bonds which are true 1 2 3 4 5 A B C D E They occur in molecules with alternating single and double bonds They can be made from sp2 hybrid bonds They are most often found in bonds involving heavy atoms They can be made from bonds They rarely if ever involve bonds with fluorine 1 4 and 5 only 4 and 5 only 1 3 and 4 only 1 2 and 3 only All of the above 15 Which of the following statements is incorrect A Hybridization accounts for the experimental observation that all F C F bond angles in CF4 are the same B All C C bond distances in benzene C6H6 are the same C The energy required to break a carbon carbon triple bond is greater than that needed to break a carbon carbon double bond D The bonding in benzene C6H6 includes 12 sigma bonds and 3 localized pi bonds E The electrons in NO3 are delocalized 16 The following molecule should be used H H C1 C2 H C C3 H The hybridizations of C1 C2 and C3 respectively are A B C D E C1 sp3 sp3 sp3 dsp3 C2 sp3 sp sp3 sp C3 sp2 sp2 sp3 sp2 None of the above 17 Borazine B3N3H6 has been called inorganic benzene What is the hybridization of the boron atoms H H H N B B N H A B C D E sp sp2 sp3 sp4 dsp3 N B H H
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