Chemistry 331 - Fall 1996

Quiz, Chapter 1

1. (2 points) Write the best Lewis structure, including all lone pairs, for CH2NOH.

2. (2 points) Refer to the compound below and identify the hybridization of every carbon atom.

3. (2 points) Refer to the same compound above and identify each polar covalent bond and indicate the direction of the polarity.

4. (2 points) Write the acid-base equilibrium reaction in which ammonium ion reacts with methanol. Identify the acids and bases involved.

5. (2 points) Using the pKa values below, identify the preferred direction for the equilibrium you just wrote.

approximate pKa values are:

NH3 / / 35

NH4+ / / 9

CH3OH / / 15

CH3OH2+ / / -2

Of the two acids involved, CH3OH2+ is stronger, so the equilibrium is favored to the left (i.e., ammonium ion isn't strong enough as an acid to protonate methanol).