F08 LS1a Pset01keyst-1

F08 LS1a Pset01keyst-1 - LS1a Fall 08 Problem Set #1 Due...

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LS1a Fall 08 Problem Set #1 Due Monday 9/29 at noon in the drop boxes on the Science Center 2 nd Floor Note: Adequate space is given for each answer. Questions that require a brief explanation should be explained in one or two sentences. Hint: Check out the practice problems 1. (12 points) Lewis structures can be used to illustrate the chemical bonding in molecules and ions. Draw a Lewis structure for each of the following, making sure to label atoms with formal charges: (a) CH 2 Cl 2 (b) NH 4 + (c) C 3 H 8 C Cl Cl H H N H H H H C C H H H H H +1 C H H H (d) PO 4 3- (e) C 2 H 2 (f) HCOOH P O O O O -1 3 - -1 -1 C C O C H H H O H P + O - O - O - - O 3 - [Note: Bonds in Lewis Dot structures can be represented by either lines or two dots] 2. (12 points) Line bond structures are a convenient way to represent organic molecules. Draw a standard line bond structure for compounds of the following molecular formulas: (Hydrogens bonded to all atoms other than carbon should be shown) (a) CH 3 CH 2 OH (b) CH 3 NHCH 2 COOH OH N H OH O (c) CH 2 CHCHCH 2 (d) (C 6 H 5 )COOH OH O
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Name: TF Name: 2 3. (4 points) Provide a molecular formula for each of the following molecules. Describe the geometry at the circled atoms. (a) An artificial sweetener (b) A legal ‘lifestyle-enhancing’ drug O O OH HO Cl HO HO OH Cl Cl N N N H O O O O (1 point for each correct formula-if they tried to write out groups it is also correct, 1 points for each correct geometry) C 13 H 21 Cl 3 O 7 C 22 H 19 N 3 O 4 tetrahedral trigonal planar 3. (16 points) Consider the following molecules: N H H H H 2 C O H Cl 1. 2. 3. 4. 5. ! + ! " ! + ! + ! + ! " ! " ! + Note: The hydrogens in #2 were omitted so we were lenient with the answers (a) (4 points) Which of the molecules are nonpolar? Briefy explain what makes them nonpolar. #4 and #5 are nonpolar. They consist entirely of C-C bonds and C-H bonds. C and H atoms have similar electronegativities and share their valence electrons in a covalent bond. (c) (4 points) Which of the molecules are polar? Indicate the partial positive and partial
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F08 LS1a Pset01keyst-1 - LS1a Fall 08 Problem Set #1 Due...

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