Chem 261 Practice Exam 1 Questions

Chem 261 Practice Exam 1 Questions - a CF 3 SH 2 b AlH 4 c...

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1. Between which of the following pair(s) of atoms would you find a polar covalent bond? a) Na and F b) P and O c) C and S d) F and F 2. Draw the resonance structure that results from the designated movement of electrons. Circle the least contributing structure. O 3. Write the electronic configuration of sodium. 4. Which of the following is trigonal planar? a) AlCl 3 b) CH 3 CH 3 c) CH 3 - d) NH 3 5. Circle all of the polar molecules shown below? a) CH 3 CHO b) CS 2 c) NH 3 d) CH 2 F 2 6. Which of the following statements is not true regarding contributing resonance structures? a) Each atom in all of the resonance structures must have a complete shell of valence electrons. b) All resonance structures must have the same arrangement of atoms. c) All resonance structures must be valid Lewis structures. d) The resonance structures may have different energies. 7. Which atomic orbitals overlap to form the sigma bonding molecular orbital of the C-N bond in the molecule? C 3 HCH NCH 3 1
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8. Circle the following compound(s) that possess(es) a formal charge?
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Unformatted text preview: a) CF 3 SH 2 b) AlH 4 c) CBr 4 d) H 2 S 9. Write the IUPAC name for the following compound? Cl Cl 10. What is the approximate value of the bond angles in a methyl cation, CH 3 + ? a) 90º b) 120º c) 104.5º d) 107.3º 11. Draw a structure for the following compound. (2R, 3R)-2-chloro-3-iodohexane (Stereochemistry must be clear from your drawing!) 12. Which of the following is a carboxylic ester? a) CH 3 CH 2 COCl b) CH 3 CH 2 COCH 3 c) CH 3 CH 2 OH d) CH 3 CH 2 COCH 3 13. Circle the statement that is true? a) All mirror images are diastereomers. b) All molecules that have stereocenters are chiral. c) Isomers that are not superimposable on their mirror images are diastereomers. d) Enantiomers have the same physical properties in a solvent like water. 14. Which species is the conjugate acid in the following acid-base reaction? H 2 SO 4 + HNO 3 HSO 4 + H 2 NO 3 1 2 3 4 a) 1 b) 2 c) 3 d) 4 2...
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This note was uploaded on 08/27/2011 for the course CHEM 101 taught by Professor Smith during the Spring '11 term at East Carolina University .

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Chem 261 Practice Exam 1 Questions - a CF 3 SH 2 b AlH 4 c...

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