U Step 4 Review the Knowledge You Need to Score High in C#

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162 U Step 4 Review the Knowledge You Need to Score High
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U Free-Response Questions
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Answer the following questions You have 15 minutes, and you may not use a calculator You may use the tables at the back of the book Answer each of the following with respect to chemical bonding and structure
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a The nitrite ion, NO2 , and the nitrate ion, NO3 , both play a role in nitrogen chemistry i Draw the Lewis (electron-dot) structure for the nitrite ion and the nitrate ion ii Predict which ion will have the shorter bond length and justify your prediction
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b Using Lewis (electron-dot) structures, explain why the ClF3 molecule is polar and the BF3 molecule is not polar c Consider the following substances and their melting points: Substance SrS KCl H2O H2S CH4 Melting point ( C) >2000 770 000 855 182
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Explain the relative values of the melting points of these substances
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Answer the following questions You have 15 minutes, and you may not use a calculatorYou may use the tables in the back of the book Answer the following questions about structure and bonding a Which of the following tetrafluorides is nonpolar Use Lewis electron-dot structures to explain your conclusions SiF4 SF4 XeF4 b Rank the following compounds in order of increasing melting point Explain your answer Lewis electron-dot structures may aid you SnF2 SeF2 KrF2 c Use Lewis electron-dot structures to show why the carbon oxygen bonds in the oxalate ion (C2O4 2 )are all equal d When PCl5 is dissolved in a polar solvent, the solution conducts electricity Explain why Use an appropriate chemical equation to illustrate your answer
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First Free-Response Question
a i Nitrite ion:
O N O
Nitrate ion:
Bonding 163
Give yourself 1 point for each structure that is correct The double bonds could be between the nitrogen and any of the oxygens, not just the ones shown Only one double bond per structure is allowed ii If you predicted the nitrite ion has the shorter bond length, you have earned 1 point The explanation must invoke resonance You do not need to show all the resonance structures You need to mention that the double bond moves from one oxygen to another In the nitrite ion, each N O bond is a double bond half the time and a single bond the other half This gives an average of 15 bonds between the nitrogen and each of the oxygens Similarly, for the nitrate ion, each N O bond spends one-third of the time as a double bond, and two-thirds of the time as a single bond The average N O bond is 133 The larger the average number of bonds, the shorter the bond is This explanation will get you 1 point b Give yourself 1 point for each correct Lewis structure ClF3 BF3 :F B F: | :F: :F Cl F: | :F:
The BF3, with three bonding pairs and zero nonbonding pairs on the central atom, is not polar The ClF3, with five pairs about the central atom, is polar because of the two lone pairs Give yourself 1 point for this explanation c You get 1 point for saying that the two compounds with the highest melting points are ionic and the other compounds are molecular You get 1 point if you say that SrS is higher than KCl because the charges on the ions in SrS are higher You get 1 point if you say H2O is higher than the lowest two because of hydrogen bonding You get 1 point if you say H2S is higher than CH4 because H2S is polar and CH4 is nonpolar There are a maximum of 11 points
Second Free-Response Question
a Silicon tetrafluoride is the only one of the three compounds that is not polar
F F Si F F F F S F F F F Xe F F
SiF4: four bonding pairs and no lone pairs Tetrahedral
SF4: four bonding pairs and one lone pair See-saw
XeF4: four bonding pairs and two lone pairs Square planar
164 U Step 4 Review the Knowledge You Need to Score High
You get 1 point if you correctly predict only SiF4 to be nonpolar You get 1 additional point for each correct Lewis structure b The order is: KrF2 < SeF2 < SnF2
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