CHEM 105, Fall 2019

Homework Exercises and Graded Problem Sets

 

Odd-numbered Textbook Exercises

You should be sure to work all of these end-of-chapter problems as we cover material in lecture. Check your answers in the back of the book and keep working and asking questions until you can do them correctly. This is your best preparation for quizzes and exams: if you can correctly complete and understand all of these problems, you will do very well in this course. (Note that the problems corresponding to each lecture are specified on the course schedule.)

 

As you know, each Wednesday (beginning 8/28), 1-3 groups of students will demonstrate solving assigned problems of their choice (one solution per group). Groups may choose from the underlined problems below; those with asterisks (*) are more challenging or more involved and carry the opportunity to earn extra credit. (Again, please refer to the course schedule to see when material related to these problems will be covered.)

 

Material for Exam I:

 

Chapter 1:

1, 3, 15, 25, 27, 49, 51, 53*, 57*, 61, 63, 65, 73*, 75&76*, 77, 79, 93c

Questions

Answer to #76: 31.1 cm3

 

Chapter 2:

5, 11, 29, 31, 49, 55

Questions

 

Chapter 3:

1, 3, 7, 17, 19, 21, 31, 35, 37, 39, 41, 43*, 51, 57, 67, 69, 73-85 odd, 87, 93, 95, 97, 99, 101-109 odd, 111, 113, 115, 117, 125, 131

Questions

 

Answers to text questions, Chapters 1-3

 

 

Material for Exam II:

 

Chapter 4:

5, 7, 19, 23, 27, 29, 31, 33, 35, 39, 41, 43, 49, 51, 55, 57, 59, 63, 67*, 77*, 81, 83*, 89, 91, 99, 105, 107, 109, 111*, 113, 115*, 119, 123, 129, 133, 135, 149, 159*

 

Chapter 5:

25, 27, 29, 33, 37, 39*, 41, 43, 47, 57, 61, 63*, 75*, 77*, 117*, 127*

Clarifications to textbook answers on hybridization (Problems 61, 63, 77): Book draws structures with expanded octets and lots of multiple bonds, which causes them to create some unusual hybrid orbitals (because they have to overlap unhybridized valence orbitals to make the double and triple bonds). We will not do this. If you avoid violating the octet rule, you will get the “usual” hybrid orbitals you’re used to seeing.

5.61 ClO2 sp3; 5.63 sp3; 5.77: S and N are each sp3 hybridized

 

Chapter 2:

69, 73, 75, 79, 81, 87, 89

 

Chapter 7:

19, 21*, 23, 27, 33*, 35, 39*, 77, 83*, 84*, 85*, 97*

Answer to #84: 78 % Yield

 

Chapter 8:

11, 13, 15, 19, 21*, 23 +29 (late addition)

 

 

Material for Exam III:

 

Chapter 10:

5, 11, 25, 41. 51-57 odd, 61, 63, 69, 71, 73, 85, 89, 97, 99, 103

 

Chapter 6:

1, 3, 19, 23, 37, 41, 53, 91

 

Chapter 9:

11, 19, 23, 25, 27, 47, 49, 53, 55, 63, 67, 71, 73, 75, 85, 87, 89, 91, 113, 115, 121

Error in Question #75: first rxn should form 1 mole NO(g) (not 0.5 mol). Answer in text is correct.

 

Chapter 12:

19, 21, 25, 27, 29, 35, 37, 39, 41, 43, 47, 49, 51, 53, 55, 59, 61, 65, 73

 

 

Material for Exam IV:

 

Chapter 13:

1, 3, 5, 7, 11, 25, 29, 31, 37, 39, 41, 47, 49, 51, 55, 57, 61-73 odd, 79, 83, 89

 

Chapter 14:

7, 13, 21, 25, 27, 31, 33, 35, 47, 49, 53, 55, 59, 63, 73-79 odd, 83, 85, 89, 91, 95, 99, 101, 107, 111, 115, 127

 

Chapter 15:

15, 17, 19, 21, 23, 35, 37, 45, 47, 49, 51, 55, 57, 59, 61, 63, 83

 

Chapter 8:

51, 53, 77, 81, 83, 89, 97, 99, 101, 111, 129

 

Chapter 16:

49

 

Chapter 17:

15, 17, 19, 21, 25, 27, 29, 35, 41, 89

 

 

In-Class Practice Problems

 

Wednesday, 9.18.19

Questions

Key

 

Wednesday, 9.25.19

Questions

Key

 

Monday, 10.21.19

Homework problem and solution from Dr. Snyder

 

 

Graded Problem Sets

Over the course of the semester, I will distribute approximately six problem sets that you will turn in for grading. Question sheets and answer keys will be posted here.

 

Material for Exam I:

 

PS #1, Due by 5 PM Monday, 8.26.19

Questions

Key

 

 

Material for Exam II:

 

PS #2, Due by 5 PM Friday, 9.20.19

Questions

Key

 

PS #3, Due by 5 PM Monday, 9.30.19

Questions

Key

 

Ungraded “PS 3.5” (Key will be posted on Thursday, 10.3.19)

Questions

Answers only

Detailed Solutions

 

 

Material for Exam III:

 

PS #4, Due by 5 PM Tuesday, 10.29.19

Questions

Key

 

 

Material for Exam IV and/or Final Exam:

 

PS #5, Due by 5 PM Friday, 11.15.19

Questions

Key

 

PS #6, Due by 5 PM Monday, 12.2.19

Questions

Key

 

Comprehensive Problems (Extra Credit), Due by 5 PM Thursday, 12.5.19

Questions

Key

 

 

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