Chemistry 222 Chapter 1 Problems with Answers

Chemistry 222 Chapter 1 Problems with Answers - Chemistry...

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Chemistry 222 Problems assigned from the text Chapter 1: 15, 21, 40, and 49 15. Write Lewis structures for these compounds. Show all valence electrons. None of them contains a ring of atoms. a. Dimethyl ether CH 3 OCH 3 b. Ethane C 2 H 6 c. Ethylene C 2 H 4 d. Acetylene C 2 H 2 e. Carbon dioxide CO 2 f. Formaldehyde CH 2 O g. Carbonic acid H 2 CO 3 h. Acetic acid CH 3 COOH C O C H H H H H H C C H H H H H H C C H H H H C C H H C O O C O H H C O O O H H C H H H C O O H
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H 3 C C H C OH OH O HO CH 2 CH 2 OH H 3 C CH NH 2 C O OH a. CH 3 CH 2 CH 2 OH b. CH 3 CH 2 CH c. CH 3 CH=CH 2 d. CH 3 C CCH 3 e. CH 3 COCH 3 f. CH 3 NCH 3 O O CH 3 C C O H H H H H H C C H Cl H H C C H C H H H 109.5 o <109.5 o 180 o 120 o 22. Use the VSEPR method to predict the bond angles and geometry about each highlighted atom a. b. Atoms with bonds angles of ~109.5 have tetrahedral geometry. Trigonal planar geometry has bond angles of 120 degrees. 180 degree bond angles denote linear geometry. c. 40. Use the VSEPR model to predict the bond angles about each atom of carbon, nitrogen, and oxygen in these molecules.
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Unformatted text preview: (Hint: First add unshared pairs of electrons as necessary to complete the valence shell of each atom and then predict the bond angles.) All C have angles of 109.5; the O angle is <109.5 Aldehyde C angle is 120. The other C angles are 109.5 Methyl C (CH 3 ) is 109.5. Other C angles are 120 Methyl C (CH 3 ) are 109.5. Other C are 180 Methyl C (CH 3 ) are 109.5. Other C is 120. O attached to methyl is <109.5 Methyl C (CH 3 ) are 109.5. N is <109.5 49. Identify the functional group(s) in each compound Hydroxyl or alcohol (secondary), carboxyl or carboxylic acid b. 2 hydroxyl or alcohol groups Amino (primary) and carboxyl or carboxylic acid...
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