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CHEMISTRY 121 1 Department of Chemistry University of British Columbia Problem Set 3 Answer Lewis Structures 1. When choosing among a set of non-equivalent electron-dot structures for a chemical species, the most favoured is the one (a) that contains the greatest number of double bonds (b) in which the sum of the formal charges is always zero (c) that contains only single bonds (d) in which the formal charges on atoms are as low as possible (e) in which the central atom always has positive formal charge The answer is: D 2. Draw Lewis structures for each of the following molecules or ions. Show lone pairs as pairs of dots and show any non-zero formal charges. (a) NF 3 (b) H 2 S (c) BCl 3 (d) CH 4 (a) [BH 4 ] (a) NF 3 N FF F (b) H 2 S S HH (c) BCl 3 B Cl Cl Cl (d) CH 4 C H H
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CHEMISTRY 121 2 Department of Chemistry University of British Columbia (e) [BH 4 ] B HH H H - 3. Which of the following represents an electron-dot structure for CN ? (a) [:C=N] (b) [:C=N] (c) [:C=N:] (d) [·C N:] (e) [:C N:] The answer is: E CN has 10 valence electrons. C and N must satisfy the octet rule and have 8 electrons around them. Only structure (5) satisfies all these requirements. 4. Draw the best Lewis structure for HNCO. The connectivity is H—N—C—O. Show lone pairs as pairs of dots and show any non-zero formal charges. HNC O 5. Two molecules that have the same atomic composition but different structures are called isomers. Draw Lewis structures for two isomers of S 2 F 2 .
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