Chemistry 132
Text Exercises

 

Office hours for Spring Quarter 2004

I have half release time so may not be available some hours during the week.
Send email or call if you want to set up an appointment. My class schedule is also on my office door.
Class schedule is: M 6-8 pm Chem 132 WK

Office: 5:30-6pm

T 1-3 pm Chem 132 BK

Office: noon- 1pm

 W 6-8 pm Chem 132

Office: 5:30-6pm

 Th noon- 1pm Lab, and 1-3 pm Chem 132 BK

Office: 11am to noon

 F Lab, 1-4 pm

Robin Terjeson, Ph.D.

Office: Science 110

Phone number: (360)992-2201

Email: rterjeson@clark.edu

 

Due dates and other assignments are on the Chemistry 132 Home Page. Return to Chemistry 132 Home Page

Spring 2004

CHEM 132 - HOMEWORK ASSIGNMENTS FROM TEXT

These homework problems represent only a small portion (the minimum) of the number of problems you are expected to work. It is the responsibility of the student to know if he/she understands the material.

NO LATE HOMEWORK IS ACCEPTED. Homework is due the class day after we finish the chapter. Therefore, you should do a few problems every day so as not to fall behind. In order to receive credit for the homework assignments, they must be written in the proper format and turned in by 2 pm on the due date.

GRADING POLICY (5, 3 or 0) Most problems have answers in the back of the book.

5 = complete and format correct, 3 = incomplete or incorrect format or sloppiness,

0 = not turned in, very sloppy, only 1 or 2 problems completed.

HOMEWORK FORMAT

  1. Write your name, assignment #, and class time in the upper right hand corner of a standard 8.5 x 11" sheet of paper.
  2. Rewrite the problem/question. You may use abbreviations but the question and given data must be clear. You may type them out if you wish.
  3. Show all work using dimensional analysis with proper units.
  4. Answers (with correct significant figures) are boxed or highlighted in the left margin of the paper. Examples on the back of this page.
  5. Papers are neat.

Prob.# and rewrite the question

Work (neatly and with all units and equations)

Problems coded in blue have answers in the back of the book. Answers to the practice exercises within the chapter are also in the book.

Chapter- End of the Chapter Practice Problems
24 25, 33, 35, 39, 47, 51, 57
11 29. 35, 39, 45, 55, 57, 61, 65, 69, 73, 81, 83, 89, 109, 119
12 33, 37, 43, 47, 55, 61, 67, 73, 81, 85, 89, 101, 113(difficult)
14 35, 39, 43, 47, 49, 57, 61, 67, 69, 71, 87, 99, 105, 109
15 21, 29, 35, 43, 49, 55, 63, 65, 67, 69, 89
16 21, 25, 31, 43, 45, 51, 59, 67, 75, 83
17 25, 29, 33, 39, 51, 57, 63, 71, 75, 79, 89, 95, 103, 123
18 19, 31, 35, 39, 47, 51, 55, 63, 79, 89, 97

Concept problems listed below may be discussed in class. Consider them like study questions.

Ch. 24.7, 14, 15, 19, 21, media 69, 71; Ch. 11. 21, 23, 25, 27; Ch.12.21, 26, 27; Ch. 14.23, 25, 27, 29; Ch. 15.15, 19; Ch. 16.17; Ch. 17.17, 19, 23; Ch. 18.11, 13, 15.

I often take questions directly from the homework assignments or packet worksheets.

All students in Chemistry should be working on their Critical Thinking/Problem Solving Ability. The problems in the book help to develop these skills. Formulating questions is a key concept. Each student must; a. comprehend a given question, b. analyze a question for components and c. devise problem solving strategies. As you continue in the course, the problems become more difficult and your skill in critical thinking will improve. Your ability to think critically will be evaluated by quizzes, exams, and group problem solving sessions. The ability to solve problems is extremely important in this course.

Process and Criteria for Problem Solving:

The four steps listed in the sample problems below are the ones you should use for solving/answering all questions and problems. Even for questions that do not use calculations, looking at the information given, information you know already, and what the question asks, will assist you in getting the correct answer. The answers are the ultimate grade for the problem. Partial credit on exams, quizzes etc. will be based on your showing all work in the format listed below.

Problem 1: The density of a metal is 8.12 g/cm3. If the sample of metal is a sphere with a radius of 0.50 cm, calculate the mass of the spherical sample.

mass=4.25 g

1. Write down the specific information needed when the problem is solved. Include units.

mass of sample = ? g

2. Write down the information you are given, labeling variables with units. Also include all information that would be useful you may know or can look up.

Density=8.12 g/mL or 8.12g= 1mL; r= 0.500 cm; Vsphere= 4/3 p r3; 1 cm3= 1mL

D=mass/vol.

3. Diagram a process for solving the problem. (Pathway)

use r —> vol sphere—> D x vol —> mass

4. Do the calculations making sure you end up with the units you want. Use the correct number of significant figures in your answer

V= 4/3 p (0.500 cm)3= 0.523 cm3= 0.523 mL

8.12 g x 0.523 mL = 4.25 g

1 mL

Problem 2: How many grams of Cl2 will react with 15.0 g sodium, according to the following equation?

2Na + Cl2 ——> 2NaCl

mass Cl2= 23.2 g

1. Write down the information you are solving for. Include units. ? g Cl2

2. Write down the information you are given labeling variables with units. Also include all information that would be useful you may know or can look up.

2Na + Cl2 ——> 2NaCl At. wt Na = 23.0 g/mol
15.0 g ?g MW Cl2 = 71.0 g/mole
  mole Cl2 (ratio from eqn.)

3. Diagram a process for solving the problem. (Pathway)

mass Na—>moles Na —>moles Cl2—> mass Cl2

4. Do the calculations making sure you end up with the units you want.

15.0 g NaCl x 1 mol Na x 1 mol Cl2 x 71.0 g Cl2 = 23.2 g Cl2
  23.0 g Na 2 mol Na 1mol Cl2  

 

Below are links to other Pages

Robin Terjeson's
Home Page		 Chemistry Department Clark College Chemistry Club Chemistry Web Sites

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Updated Mar. 25, 2004. Questions or comments on this Web site should go to Robin Terjeson.