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Quiz 3-solutions - Version 163 Quiz 3 sparks(51150 This...

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Version 163 – Quiz 3 – sparks – (51150) 1 This print-out should have 10 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0points Which of the following is most likely to form multiple (double or triple) bonds? 1. N correct 2. F 3. Cl 4. Li 5. H Explanation: Hydrogen can form only one bond, so it can immediately be ruled out as the correct answer. Lithium forms ionic bonds rather than co- valent bonds, so we can rule it out also. Both chlorine and flourine need only one more electron to fill their octet and they there- fore tend to form only single bonds. Nitrogen needs 3 more electrons to fill its octet and is therefore most likely to form mul- tiple bonds. 002 10.0points The dot structure for BeCl 2 has how many lone pairs on the central atom? 1. 0 correct 2. 3 3. 5 4. 4 5. 1 6. 2 Explanation: Beryllium brings in 2 valence electrons and each chlorine brings in 7 valence electrons, for a total of 16 valence electrons: Cl Be Cl and the octet rule is satisfied for each Cl. Be is a known exception to the octet rule in that it can form stable compounds with only 4 valence electrons.
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