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hw6sol - wilson(tw8656 H06 Bonding mccord(50960 This...

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wilson (tw8656) – H06 : Bonding – mccord – (50960) 1 This print-out should have 33 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. All students from Dr. McCord’s MWF 11am class (50960) must report to the correct room for the exams. There are 2 different rooms and the class is split according to the first letter of your last name. Go to the right room or you WILL receive a zero on the exams. A-L go to UTC 2.112A M-Z go to UTC 2.102A 001 10.0points Let X be a hypothetical element. Which of the following would be largest? 1. X 2. X - 3. X + 4. X 2 - correct 5. X 2+ Explanation: X 2 - would be largest as it has 2 more electrons than protons, and the protons here would be at the greatest disadvantage when trying to draw the electrons towards the nu- cleus. 002 10.0points If the following crystallize in the same type of structure, which has the lowest lattice energy? 1. BaS correct 2. SrS 3. BaO 4. SrO 5. CaO Explanation: Lowest charge densities due to larger size. 003 10.0points Which pair of elements is most likely to form an ionic compound? 1. oxygen and chlorine 2. sodium and aluminum 3. magnesium and fluorine correct 4. nitrogen and sulfur Explanation: Mg is a metal and F is a nonmetal. N and S are both nonmetals. O and Cl are both nonmetals. Na and Al are both metals. 004 10.0points Compounds which are characterized as cova- lent are generally made up of elements found in which part of the Periodic Table? 1. upper right correct 2. upper left 3. lower left 4. left and right Explanation: Covalent compounds are formed from ele- ments with small Δ E N , or nonmetal elements. These are found in the upper right corner of the periodic table. Very metallic elements are found in the lower left corner of the periodic table. 005 10.0points Which is the correct order of increasing bond strength? 1. single, triple, double 2. single, double, triple correct 3. double, triple, single
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wilson (tw8656) – H06 : Bonding – mccord – (50960) 2 4. double, single, triple 5. triple, double, single Explanation: More energy is required to break a triple bond than a double bond, and more energy for a double bond than a single bond. 006 10.0points Which do you predict to have the strongest CN bond? 1. NH 2 CH 3 2. NHCH 2 3. HCN correct 4. All are equal Explanation: The bond orders as determined by drawing the Lewis structures are 2 for NHCH 2 , 1 for NH 2 CH 3 , and 3 for HCN; therefore HCN will have the greatest bond strength. 007 10.0points Which of the following contains only covalent bonding and no ionic bonding? 1. NaCl 2. CCl 4 correct 3. Ca(NO 3 ) 2 4. Na 2 SO 4 5. NaOH Explanation: In NaCl, Na is a metal, and Cl is a non- metal. An ionic bond would be expected to form in this compound. In Na 2 SO 4 , Ca(NO 3 ) 2 , and NaOH, a polyatomic ion is present. While covalent bonds attach the atoms within the polyatomic ion, ionic bonds connect these polyatomic ions to their metal atoms. Only CCl 4 , which contains 4 C Cl bonds (which involve bonding between two nonmetallic elements), contains only covalent bonds.
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