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homework2 - Version 109 Homework 2 Sutcliffe(53980 This...

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Version 109 – Homework 2 – Sutclife – (53980) 1 This print-out should have 17 questions. Multiple-choice questions may continue on the next column or page – Fnd all choices be±ore answering. Solubility Rules can be seen in Table 5.9 in your book or you may download a pd± ±rom Blackboard, under COurse Documnents, Use±ul Items. NOTE ²OR Q9: We’re looking ±or the most commonly used steps, but they might not be listed in the order they are done. 001 10.0 points Use electron-dot notation to demonstrate the ±ormation o± an ionic compound involving the elements Na and S. 1. b Na + b Na + b Na + b b b b b S -→ Na + + Na + + Na + + b b b b b b b b S 3 Na 3 S 2. None o± these 3. b Na + b Na + b b b b b b S Na + + Na + + b b b b b b b b S 2 Na 2 S correct 4. b b b Na + b b b b b S Na 3+ + b b b b b b b b S 3 NaS 5. b b Na + b b Na + b b Na + b b b b b S + b b b b b S Na 2+ + Na 2+ + Na 2+ + b b b b b b b b S 3 + b b b b b b b b S 3 Na 3 S 2 6. b b b Na + b b b Na + b b b b b b S + b b b b b b S + b b b b b b S Na 3+ +Na 3+ + b b b b b b b b S 2 + b b b b b b b b S 2 + b b b b b b b b S 2 Na 2 S 3 7. b b Na + b b b b b b b S + b b b b b b b S Na 2+ + b b b b b b b b S + b b b b b b b b S NaS 2 8. b Na + b b b b b b b S Na + + b b b b b b b b S NaS 9. b b b Na + b b b b b b b S + b b b b b b b S + b b b b b b b S Na 3+ + b b b b b b b b S + b b b b b b b b S + b b b b b b b b S Na 2 S 3 10. b b Na + b b b b b b S Na 2+ + b b b b b b b b S 2 NaS Explanation: b Na gives up an electron to ±orm the Na + cation and b b b b b b S acquires two electrons to ±orm the b b b b b b b b S 2 anion: b Na + b Na + b b b b b b S Na + + Na + + b b b b b b b b S 2 Na 2 S 002 10.0 points SO 2 4 is more/less polar than SO 2 3 because 1. less; the ±our polar S O bonds in SO 2 4 are symmetrical and cancel the dipole moments. correct 2. more; it has ±our polar S O bonds rather than three polar S O bonds. 3. less; it is a resonance structure. 4. more; the ±our polar S O bonds in SO 2 4 are arranged non-symmetrically leaving a net dipole moment. 5. more; the tetrahedral geometry increases the polarity o± S O bonds Explanation: SO 2 4 has no lone pairs on the central S atom. It has tetrahedral molecular geometry.
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