oldr_exam_answer_key

oldr_exam_answer_key - Name: Problem 1 (12 pts) Draw a...

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Name: Problem 1 (12 pts) Draw a complete Lewis structure for each of the following molecules or ions and indicate formal charges. (None of the structures have O—O bonds) a. HCN HC N b. CO 2 OC O c. HCO 3 HO C O O d. NO 2 ON O Problem 2 (20 pts) Draw ALL the possible resonance structures for each of the following molecules using curved arrow notation to show the movement of electron. Are they all equivalent? If so, write “equivalent”. If not, circle the major (more important) resonance structure(s). a. Ozone (O 3 ) Answer : O O O O O O , equivalent b. Diazomethane (CH 2 N 2 ) Answer : CN N H H N H H c. Guanidium Cation (Lewis structure below) NH 2 NH 2 H 2 N Answer : 2 2 H 2 N 2 2 H 2 N 2 NH 2 H 2 N , equivalent 1
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Name: Problem 3 (8 pts) Predict the approximate bond angle in each of the following molecules. BeH 2 Cl 4 Si CH 2 3 b. c. d. a. Answer : a. 180° , b. 109.5° , c. ~120° , d. 120° Problem 4 (9 pts) Label each pair as constitutional isomers, conformational isomers, stereoisomers, identical molecules, or none of the above. a. F H H H Br Br H F H H and Conformational isomers b. Br H H H F Br F H H H and Constitutional isomers c. F H H H F H H Br H and Stereoisomers Problem 5 (15 pts) For each pair, circle the molecule with the lower pKa and provide a brief explanation
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oldr_exam_answer_key - Name: Problem 1 (12 pts) Draw a...

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