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Chemistry 113 Practice Exam 4 Spring 2016 Directions on actual Exam: The exam consists of 2 sections (Chemical Bonding and Geometry and IMFs. Each...

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Chemistry 113 PracTce Exam 4 Spring 2016 Directions on actual Exam : The exam consists of 2 sections (Chemical Bonding and Geometry and IMFs. Each multiple choice question is worth 4.33 points. You are allowed to use a scientific (nonprogrammable) calculator, periodic table, and VSEPR Theory Table. Useful information: ΔH° rxn = Σ n×D(bonds broken) - Σ n×D(bonds formed) where Σn represents the sum of the moles of a particular type of bond D represents bond energy per mole of bond Chemical Bonding and Geometry 1. The Lewis dot symbol for the calcium ion is A) Ca : : 2+ B) Ca C) Ca   : : 2+ D) Ca 2+ E) Ca 2. The electron dot structure for AsCl 3 molecule shows A) a total of 84 electron dots B) three single bonds and 10 lone pairs C) two single bonds, one double bond, and 9 lone pairs D) one single bond, two double bonds, and 8 lone pairs E) three single bonds and one lone pair 3. The correct Lewis structure for CO 2 is: C A) B) C) O O O O O O
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D) 4. Which of the following Lewis structures is incorrect ? A) B) C) D) E) 5. How many covalent bonds will be formed by bromine in BrO 3 for the dot structure that expands the octet to minimize formal charge and places negative formal charges on only the most electronegative atom(s). The Pauling electronegativity values are: Br = 2.8; O = 3.5 A) 3 B) 4 C) 5 D) 6 E) 7 6. Estimate the enthalpy change for the reaction 2CO + O 2 2CO 2 given the following bond energies. BE(C O) = 1074 kJ/mol BE(O=O) = 499 kJ/mol BE(C=O) = 802 kJ/mol A) +2380 kJ/mol B) +744 kJ/mol C) +1949 kJ/mol D) –561 kJ/mol O O O
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