CHEMISTRY 253

Spring, 2015 - Dixon

Homework Set 3 (for Exam 3)

Problems in bold are to be turned in for grading,

others are for your own benefit

Chapter Problems Date to finish    

Set 3.1                                                                                                          April 22

Ch. 5                Problems: 1, 2, 5, 6, 9

                        Review Questions: 2, 4-7, 9-12, 17, 19, 20

                        Additional Problems: 3, 6, 8

Set 3.2

Ch. 6                Revised Reading Assignment: 223-236;                                 April 29

                        252-261; 269-272

                        Problems: 1

                        Review Questions: 2, 5-8, 15,

                        Additional Problems: 1, 4

Ch. 7                Revised Reading Assignment: 291-307

                        Problems: 1, 3,

                        Review Questions: 2, 3, 5, 8, 9, 11

                        Additional Problems: 1

Green Chemistry Homework problems:

Reading assignment: Green Chemistry Sections of Introduction, Chapter 3, and Chapter 13.

1. Find the structure of at least three of the POPs given in Table 13-2.  What is the common structural feature in these compounds?  Are any or all of them legal to use currently in the US?  Cite the source for your information—please NEVER use Wikipedia.

2. Everything is toxic; it is all a question of dosage.  Find the LD50 values for the following compounds around the house:  Bleach, gasoline, acetaminophen, capsaicin (from hot peppers!) and Windex.   Calculate how much Windex you would need to ingest to reach the LD50 dosage.  You may assume the Windex has the same density as water.  Please convert this value into cups, to give yourself a good visualization.

3. Why would Harpin (a pesticide, section 2.16) not be expected to accumulate in the environment in the same way that many other pesticides do?

4. a) The first dry cleaning solvents were gasoline and kerosene.  What are the hazards associated with these solvents? b) PERC replaced these chemicals as a popular solvent in the middle of the 20th century.  What are the hazards associated with PERC? What advantage did it have over kerosene?  c) Liquid CO2 is now a popular replacement solvent for PERC.  Does this new solvent have any associated hazards?

5. Even though most ions have extremely high melting points, ionic liquids melt near room temperature.  What are the features in ionic liquids which lead to this low mp?  What are the advantages to using an ionic liquid in place of a typical organic as a solvent?

6. Find an old reaction from lab—you may use your own data or find a current organic lab student and bribe them to share data with you.  List the reagents, solvents, catalyst, products/byproducts for the reaction being performed.  Calculate a theoretical yield for the reaction.  Calculate atom economy for this reaction.

Set 3.4

Girard, Ch. 16: 1, 4, 5, 6, 7, 8, 14, 15, 16 [4, 5, and 8 collected]