Exam 2

CH 130

May 21, 1998

There are three pages and twelve (12) questions on this exam. Be sure you have them all.

1. Describe or define precisely, providing an example

Alkyl ammonium ion (3 points)

 

Polyamide (3 points)

Reaction mechanism (3 points)

 

Tertiary amine (3 points)

2. In the Amylases and Starch experiment, you placed equal amounts of an I₂ solution in a string of wells and then added drops from a "sample" dropper to the wells at timed intervals.

A. Describe what was in that "sample" dropper.

(5 points)

B. Was the composition of the "sample" dropper constant during a given timed trial? Explain.

 

(5 points)

C. How did the color of the solution in the wells provide information about the reaction?

(5 points)

3. Draw one carboxylic acid and one ester with the formula C₅H₁₀O₂. Give the names of each of them. These species are which: isomers or conformers of each other?

(5 points)

4. Why are so many drugs sold in the "HCl" form? What is the most likely functional group involved, and show the type of reaction used to make the "HCl" form.

(5 points)

5. Give an example of the structure of a polyester. Your example may use a real or hypothetical compound.

(5 points)

6. Which would likely have the higher boiling point: CH₃COCH₃ or CH₃NHCH₂CH₃? Explain. Identify the type of molecule represented by each one.

(5 points)

7. A. What type of reaction is responsible for the damage that acid rain does to old buildings and sculptures? Be as specific as you can.

(5 points)

B. What is the reason for the formation of an "eye" when a drop of slightly basic (blue) bromocresol green solution is exposed to an atmosphere containing NO_x?

(5 points)

8. Predict the products which would result if each of the following compounds is subjected to mild oxidizing conditions, and name each of the three reactants as well as any products.

(15 points)

9. Provide structures for each of the following:

pentanoic acid ethanal (acetaldehyde)

(6 points)

methylpropanoate butanone

(6 points)

10. Draw the structure of the molecules which would result from the hydrolysis of heroin:

(5 points)

11. Name one class of molecules known for its foul smell and another that is known for its pleasant smell? Draw a typical structure of each type.

(5 points)

12. Draw the structures of formic and acetic acids and identify which is which.

(6 points)