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(CHEM111)[2003](s)quiz~ylwongab^_10040.pdf
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Quiz #1, CHEM 111, Fall Semester, 2003/2004
Student Name: Student ID #: Section:

Note: You are required to complete all questions independently. Reference materials and textbook are prohibited. Total marks for this quiz is 50 points.
Question 1: Draw the Lewis structure for thionyl chloride SOCl2 and calculate the formal charges on S
and O atoms (d orbitals for S are not considered here). (10 points)
Answer:

Question 2: (1) Draw two isomeric molecules for the formula, CH3NO2. (6 points)
(2) For each isomer, draw all valid resonance structures and indicate the more stable
resonance form. (6 points) Answer: (1)
(2)
Question 3: Draw the structures of the following molecules. (6 points)
(1) 3-Ethyl-1,1-dimethylcyclohexane
(2) 2-Cyclobutylpentane
Answer: (1) (2)

Question 4: Write equations for the following acid-base reations. Use the given pKa values to predict the following reactions likely occur from left to right direction? (12 points)
(1) HCOOH + CN (2) CH3OH + NaNH2
pKa: HCOOH = 3.76; CH3OH = 15.5; HCN = 9.22; NH3 = 33
Answer: (1)
(2)
Question 5: For BF3:
(1)
Indicate hybridization of B and the shape of the molecule; (4 points)

(2)
Draw the structure of BF3 and indicate the polarity of each BCF bond. (4 points)

(3)
Estimate the dipole moment of BF3 (2 points)


Answer: (1) (2) (3)