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FALL2006_Exam_4[1]

FALL2006_Exam_4[1] - 1 CHEM 109 EXAM 4 FALL 2006 SHOW ALL...

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CHEM 109 EXAM 4 FALL 2006 – SHOW ALL WORK – NO WORK – NO CREDIT 1. (10 pts) (a) In the box provided, diagram the complete Lewis electron dot diagram for the compound tin(II) chloride, SnCl 2 . (Note: Cl = chlorine!) Name the molecular shape of the compound. Number of valence electrons in SnCl 2 : ______ Molecular shape: _______________________ (b) In the box provided, diagram the complete Lewis electron dot diagram for the anion [SnCl 3 ] . (Note: Cl = chlorine!) Name the shape of the molecule. Number of valence electrons in [SnCl 3 ] : ______ Molecular shape: _______________________ 2. (10 pts) (a) What are the bond angles around the labeled carbon atoms? (1) N–C–C __________ (2) C–C–C __________ (3) C–C–H __________ (b) Look back at the structure above. How many sp hybridized carbons are present? _______ (c) Circle the shortest carbon–carbon bond. (d) Draw an arrow to the carbon–carbon bond that has the largest bond enthalpy. 1 N C C C C H H H H H 1 2 3
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CHEM 109 EXAM 4 FALL 2006 – SHOW ALL WORK – NO WORK – NO CREDIT 3. (10 pts) (a) Azodicarbonamide (shown below) is used to provide the foaming pressure to make liquid styrene into the lightweight objects such as cups and plates. Examine the structure and answer the following questions: (i) How many carbon atoms are in this molecule? __________ carbon atoms (ii) How many lone pair electrons are implied in the structural formula for azodicarbonamide? __________ electrons (iii) Circle any and all atoms that ARE NOT sp 2 hybridized. (b) Methyl cyanoacrylate, the active ingredient in superglue (shown below) quickly reacts to form a type of polymer that sticks to most everything. (i) What is the hybridization of the nitrogen atom? __________ (ii) How many pi bonds are present in the molecule? __________ (iii) How many atoms are sp 3 hybridized in this molecule? __________ 2 N N N N O O H H H H H 3 C O C O C C C N H H azodicarbonamide Methyl cyanoacrylate
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