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Unformatted text preview: chauhan (mmc2762) Feb 21 HW sparks (51150) 1 This print-out should have 11 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. A Molarity help sheet and extra practice problems are located on pgs 19-22 of your Course Packet. Makre sure to preview sec- tions 14.1 and 13.13 of the textbook for Thurs- days class. Also remember that there is a sto- ichiometry review Wednesday (details posted on BB announcements). 001 10.0 points Which of the following contains exactly one unshared pair of valence electrons? 1. SiH 4 2. H 2 S 3. C 2 H 4 4. NaCl 5. PH 3 correct Explanation: The PH 3 molecule contains exactly 1 un- shared pair of valence electrons: P H H H You can check this structure for correctness by verifying that each atom has the correct number of electrons around it (8 for most ele- ments, 2 for hydrogen) and that the structure shows the correct total number of valence elec- trons (calculated by adding up the available valence electrons from each atom). The C 2 H 4 molecule contains no unshared pairs; SiH 4 contains no unshared pairs; NaCl (an ionic compound) contains 4 unshared pairs; and H 2 S contains 2 unshared pairs....
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- Spring '12