practice exam 2 key - Chem. 610A, Fall 2002, Prof. Krische...

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Chem. 610A, Fall 2002, Prof. Krische Midterm Exam II Name: Key Problem 1. (12 points) 2. (12 points) 3. (8 points) 4. (18 points) 5. (16 points) 6. (15 points) 7. (10 points) 8. (9 points) Total Points: /100 Periodic Table of the Elements H He Li Be B C N O F Ne Na Mg Al Si P S Cl Ar K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe Cs Ba La * Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn Fr Ra Ac ** Rf Db Sg Bh Hs Mt 110 111 112 113 La nthanides * Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Ac tinides ** Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr pKa Values : Alcohol (16), Protonated Alkylamine (9), Hydronium Ion (1.74), Carboxylic Acid (4.5), Ketone (22), Protonated Oxygen of C=O Double Bond (-7), HCl (-7), Water (15.7).
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1. (12 points) Rank the following compounds in terms of increasing acidity (i.e. 1 = least acidic, 3 = most acidic). For each compound, circle the most acidic hydrogen. A. CO H H H CS H HH CN H H HHH H H 1 23 (equivalent) B. C O H 3 H C O C H 2 OH Cl C O Cl 3 H 1 2 3 C. C O H 3 H H 2 C H 3 H C O H 3 CC H 3 1 2 3 (all H atoms equivalent)
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2. (12 points) Complete the following acid-base reactions. Use the arrow pushing formalism to show the movement of electrons. Indicate which side of the equation is favored at equilibrium by circling the compounds on that side of the equation. If K eq ~ 1, circle both sides of the equation. A. CO C O Cl H H H H H Cl C O H H H H H pK a ~ -7 pK a ~ -7 (+ resonance structure) B. C O O H H H H H O H H C O H H H (+ resonance structure) pK a ~ 4.5 pK a ~ 15.7 C.
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practice exam 2 key - Chem. 610A, Fall 2002, Prof. Krische...

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