CH301 Fall 2009 Worksheet 5 1. Draw Lewis structure for the following ionic compounds and answer the questions posed.a. A salt formed from aluminum and oxygen. What is the unit formula? What is the totalnumber of electrons exchanged? Which species gives up electrons?b. A salt formed from magnesium and sulfur. What is the unit formula? What would be itsname? How many electrons are exchanged?c. A salt formed from ammonium (NH4+) and nitrate (NO3-). What sort of bonds arepresent in this salt?2. Draw Lewis structure for the following species and decide which would exhibit resonance.Name the electronic geometry of each molecule as well.a. O3b. NH3c. PO43-(see the "formal charge" topic in your course notes to get the correct structure.)d. HCN3. How many resonance structures would each of the following species exhibit?a. C6H6, aka benzene (hint: the carbons form a ring and the molecule is symmetrical)b. NO2c. H2O4. Define resonance in your own words.5. Draw the Lewis structure for each of the following.a. CH3NHOHd.H2O2c.CH3SCH36. Members of which group on the periodic table would be most likely to form stablecompounds with fewer than 8 valence electrons? Why? Give an example, draw its Lewisstructure.7. Which element always fails to satisfy the octet "rule" and yet is always "happy?"8. a. An atom, ion or molecule which has an odd number of valence electrons is calledwhat?b. In such a molecule, which atom will most likely have the unpaired electron?9. Without drawing Lewis structures, consider the atoms, ions and molecules below andcross out the ones that aren't radicals.NH3H Li+F2H2O2N NO NO2NO3-PO43-Cl C6H6CH4I I3-10. Draw Lewis structures for the compounds below.a. C2H6b. C2H4c. C2H211. Consider the list of compounds below. Cross out any compounds that cannot exist.XeF6NO43-OF6I3-SO42-NO3-PCl5F3+12. What do the molecules that you crossed out in question 11 have in common? Why can'tthey exist?13. What are the two main factors that determine lattice energy? Which of our periodictrends is most useful here? Which of the two makes the greater contribution to differencesin lattice energy observed in different salts?14. Rank the following sets of salts from least to greatest lattice energy.a. LiF, CsBr, KClb. CaO, AlN, KIc. Na2S, RbI, MgO, Al2S3d. NaClO, NaClO3, NaClO4, NaClO215. Calculate the difference in electronegative (ΔEN) for the following diatomic species.Approximations are fine.a. LiHb. BeOc. HFd. BNe. LiF16. Rank the following species from lowest to highest ΔEN: IBr, ClI, IF, F2, BrF17. Assign formal charges to each atom in the following species.a.b.18. Consider the two resonance structures of cyanate below. Which makes the greatercontribution to the observed resonance hybrid?19. What is the proportionality between...a. ΔEN and bond energy?b. ΔEN and bond length?c. bond energy and bond length?20. Rank the following species from (_____): IBr, ClI, IF, F2, BrFa. greatest to least bond energyb. shortest to longest bond
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