141 Exam 3 Sp08 Key-3

141 Exam 3 Sp08 Key-3 - Grossmont College Chemistry 141...

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Name _____________________________ Chemistry 141 Spring 2008 Section__________ Date ______________ Exam 3 Part I: Multiple Choice (2 points each) Directions: Please circle the best answer for each of the following questions. Question 1. Choose the paramagnetic species from below. a) Ca b) O 2- c) Nb 3+ d) Zn e) none of the above Question 2. Which of the following statements is true? a) The total number of molecular orbitals formed doesn’t always equal the number of atomic orbitals in the set. b) A bond order of zero represents a stable chemical bond. c) Electrons placed in antibonding orbitals stabilize the ion/molecule. d) all of the above e) none of the above Question 3. What is the hybridization of the Br atom in bromine trichloride? a) d 2 sp 3 b) dsp 3 c) sp 3 d) sp 2 e) sp Question 4. Place the following in order of increasing radius: Ca 2+ S 2- Cl - a) Ca 2+ < Cl - < S 2- b) Cl - < Ca 2+ < S 2- c) S 2- < Cl - < Ca 2+ d) Cl - < S 2- < Ca 2+ e) Ca 2+ < S 2- < Cl - Question 5. Which of the following processes are exothermic? a) the second ionization energy of Mg b) the sublimation of Li c) the bond energy of I 2 d) the heat of formation of NaBr e) none of the above Question 6. Place the following in order of increasing NO bond length: NO 2 - NO 3 - NO a) NO < NO 2 - < NO 3 - b) NO 2 - < NO 3 - < NO c) NO 3 - < NO < NO 2 - d) NO 3 - < NO 2 - < NO e) NO 3 - < NO 2 - < NO Question 7. Choose the compound below that should have the highest melting point according to the ionic bonding model. a) AlN b) MgO c) RbI d) NaF e) none of the above Question 8. Using periodic trends, place the following bonds in order of increasing ionic character: S-F Se-F O-F a) Se-F < S-F < O-F b) S-F < Se-F < O-F c) O-F < Se-F < S-F d) O-F < S-F < Se-F e) none of the above Question 9. How many of the following molecules are polar? XeCl
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This note was uploaded on 05/01/2011 for the course CHEM 1A taught by Professor Nitsche during the Spring '08 term at Berkeley.

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141 Exam 3 Sp08 Key-3 - Grossmont College Chemistry 141...

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