Mr. Tran's Chemistry Class

Finals Study Guide

2009-06-15T09:07:00.000-07:00

Download the Complete Study Guide HERE: study guide

You can find selected answers HERE: study guide answers

Heating Curves and Phase Diagrams

2009-06-12T06:07:00.000-07:00

Please visit the following website and scroll down until you get to 11.6: Heating Curves.

Click on the link and go through the tutorial with your partner.

http://www.wwnorton.com/college/chemistry/gilbert/index/site_map.htm#tutorials

And after our demo on Carbon Dioxide, click on this link again and go down to 9.7: Phase Diagrams.

Heating Curve for Water

2009-06-10T11:15:00.000-07:00

Look below for the sample chart of data from today's lab:

GREAT JOB GROUP 1 PERIOD 6!!

Use this graph to help you complete your HW.

Here is a copy of some raw data:

pH and Titrations Review Problems

2009-06-08T12:09:00.000-07:00

4a.) The hydronium concentration is greater than the hydroxide concentration.

6.) a. neutral
b. basic
c. neutral
d. acidic
e. neutral
f. acidic
g. basic

8.) a. hydronium conc = 3.0 x 10^-2 M, hydroxide conc = 3.3 x 10^-13 M
c. hydronium conc = 5.0 x 10^-3 M, hydroxide conc = 2.0 x 10^-12 M

9.) a. 2.00
b. 3.00
c. 5.00
d. 4.00

11.) a. 12.00
b. 11.00
c. 10.00

13.) a. 1 x 10^-3 M
b. 1 x 10^-7 M
c. 1 x 10^-11 M
d. 1 x 10^-5 M

15.)a. 5.9 x 10^-5 M
b. 2.2 x 10^-8 M
c. 3.3 x 10^-10 M

16.) a. 2.0 x 10^-3 M
b. 5.0 x 10^-12 M
c. 1.1 x 10^-2 mol HNO₃
d. 0.69 g HNO₃
e. PLEASE IGNORE!

20.) a. The end point is reached when the unknown solution has been completely neutralized. This happens when the two substances (acid and base) are present in chemically equivalent amounts.
b. The indicator is present to change colors when the end point is reached.

24. a. 1.0 mol NaOH
b. 0.75 mol HNO₃
c. 0.10 mol Ba(OH)₂
d. 0.90 mol H₂SO₄

25.) 7.50 x 10^-2 M KOH

26.) 3.02 x 10^-2 M HNO₃

Neutralization Reactions and Part of Drip Drop

2009-05-30T14:46:00.000-07:00

Self-Guided Practice on pH problems

2009-05-20T07:03:00.001-07:00

http://lrc-srvr.mps.ohio-state.edu/under/chemed/qbank/quiz/bank12.htm

Online HW Assignment Website

2009-05-15T11:15:00.001-07:00

http://quest.cns.utexas.edu/

Weak vs Strong Acids

2009-05-11T13:03:00.000-07:00

http://www.mhhe.com/physsci/chemistry/essentialchemistry/flash/acid13.swf

Please click on the link above and take notes on the tutorial on your HW from last night. How does it compare with the paragraph that you wrote?

What Does Dissolving Look Like?

2009-04-06T14:07:00.000-07:00

http://www.chem.iastate.edu/group/Greenbowe/sections/projectfolder/flashfiles/thermochem/solutionSalt.html

Gas Law Problems - Answers

2009-04-02T11:15:00.000-07:00

As always, please email with questions:

1. 466 mL
2. 461 mL
3. 539 mL
4. 53.4 g/mol
5. 673 mL
6. 325 mL
7. 0.935 atm
8. 0.635 g SO₂
9. 785 mL
10. 1.02 L
11. 436 mL

Creating ID for Online HW

2009-03-03T07:05:00.000-08:00

https://idmanager.its.utexas.edu/eid_self_help/?createEID&qwicap-page-id=A386D066E290AA8F

Student Quest (UT) Website Instructions

1. Log onto https://quest.cns.utexas.edu.
2. Click on Getting Started.
3. Click on I need a UT ID
4. Click on Get a UT ID.
5. Click on Continue.
6. Choose all No’s and Continue.
7. Fill in your personal info and click on Continue.
8. I’m not sure how you get your user id and password, but I presume that they email it to you.
9. Once you have a user id and password, repeat the first two steps above, but then type in your user id and password and log in.

After logging in with User ID and password, go to:

quest.cns.utexas.edu
Click "Get Started" or "My Courses"

10. Then click on Enroll in New Course.
11. Type in 5119 in course number and then click on lookup course info.
12. Click on Request Enrollment.
13. Click on assignment Mole Ratio Practice and try to answer each question.
14. Your grade for your next few assignments will be based on your grade on-line, but you can retry a problem when you get it wrong.

Answers to Selected Questions from "Writing Chemical Equations"

2009-02-10T11:15:00.000-08:00

1. 2Cu + O₂ → 2CuO

3. (NH₄)₂CO₃ → 2NH₃ + CO₂(g) + H₂O

5. Ca + 2H₂O → Ca(OH)₂ + H₂

7. 4Cu + O₂ → 2Cu₂O

Tutorial: Empirical Formula

2009-01-13T13:35:00.001-08:00

List of Polyatomic Ions

2009-01-07T10:50:00.001-08:00

Selected Compound Formulas from Mole Mass Calculations

1.c. NH₄C₂H₃O₂

1.f. K₂SO₄

2.c. Ca₃(PO₄)₂

2.e. Fe₂(CO₃)₃

If you are having serious trouble with finding the formulas for these compounds, you can try looking up their names on the internet. However, make sure that if you can't do chemical formulas that you come to tutoring on Thursday.

Bonding Project Example

2009-01-05T08:09:00.000-08:00

Covalent Bonding Project Example

Covalent and Ionic Bonding Tutorial

2008-12-02T07:46:00.000-08:00

Covalent Bonding Tutorial

http://www.teachersdomain.org/asset/lsps07_int_covalentbond/

Ionic Bonding Tutorial

http://www.teachersdomain.org/asset/lsps07_int_ionicbonding/

Periodic Trends Practice

2008-11-17T12:31:00.001-08:00

http://www.sciencegeek.net/Chemistry/taters/Unit2PeriodicTrends.htm

Unit 3 Test Study Guide Activity

2008-10-30T08:12:00.000-07:00

Tomorrow's test will cover the standards listed on the Unit 3 - Study Guide.

Each group will need to do the following:

Come up with a consensus summary of the notes, activities and worksheets from your HW.
Come up with three multiple choice questions.
Solutions to multiple choice questions need to be emailed to Mr. Tran. Make sure you sign your group's name and period number and list the answers in the right order.

The best 2 multiple choice questions from each class will appear on tomorrow's test!

Selected Answers to Atomic Structure WS

2008-10-20T10:54:00.000-07:00

H⁺

Atomic Number: 1
Atomic Mass: 1.0079
Mass Number: 1
Protons: 1
Neutrons: 0
Electrons: 0

Ag⁺¹

Atomic Number: 47
Atomic Mass: 107.868
Mass Number: 108
Protons: 47
Neutrons: 61
Electrons: 46

Reading on Atomic Theory

2008-10-15T14:16:00.000-07:00

Take a look at this reading to help you with tonight's HW:

Melting Point and Boiling Point

2008-10-06T19:00:00.000-07:00

http://www.harcourtschool.com/activity/hotplate/index.html

Answer to Selected Density WS II Questions

2008-10-03T11:46:00.000-07:00

3. 7.68 g/cc

5. 3.17 g/ml

7. 0.0081 g/cc; yes it will float.

The First 20 Elements

2008-10-03T08:22:00.000-07:00

Follow this link to research the chemical and physical properties of the first 20 elements of the periodic table.

http://periodic.lanl.gov/default.htm

Answers to Selected Dimensional Analysis Practice Questions

2008-09-22T11:23:00.000-07:00

10.) 30.0 lb/L

12.) 32,040,000 ft or 3.204 x 10⁷ ft

13.) 1.80 x 10³ yds/min

15.) 278 mg

If you would like confirmation of other answers, feel free to email Mr. Tran

Dimensional Analysis Project Links

2008-09-17T15:23:00.000-07:00

For Background information on Olympic Medals:
www.bargaineering.com/articles/price-of-olympic-medals.html

To choose what year of the Olympics and find how many grams of each metal:
www.hesge.ch/heg/vous_etes/doc/stages/2004/sta04_schnyder_annexe1.pdf

For insight on how to solve this problem:
www.articlesbase.com/hobbies.../michael-phelps-olympic-medals-the-real-value-of-his-eight-gold-medals-526179.htm

Also, doing a Google Search on "Gold Commodity Price" will also give you a dollar amount. That is the cost per troy ounce.

Good luck!

Scientific Notation and Significant Figures Worksheet Answers

2008-09-11T11:27:00.000-07:00

Scientfic Notation

1. 5 x 10^-3
2. 5.050 x 10³
3. 8 x 10^-4
4. 1 x 10³
5. 1 x 10⁶
6. 2.5 x 10^-1
7. 2.5 x 10^-2
8. 2.5 x 10^-3
9. 5 x 10²
10. 5 x 10³

1. 1500
2. 0.0015
3. 0.0375
4. 375
5. 220000
6. 0.335
7. 0.00012
8. 10000
9. 0.1
10. 4

Significant Figures

1. 1
2. 2
3. 3
4. 4
5. 1
6. 4
7. 6
8. 1
9. 4
10. 5

1. Over the 4 with 3 s.f.
2. Over the last 0 with 3 s.f.
3. Over the 5 with 4 s.f.
4. Over the last zero in 2.000 with 4 s.f.
5. Over the last zero with 5 s.f.
6. Over the 1 with 3 s.f.
7. Over the 7 with 2 s.f.
8. Over the last 0 with 8 s.f.
9. Over the 1 with 3 s.f.
10. Over the last 0 with 3 s.f.

2008-04-18T10:48:00.000-07:00

Example Conclusion from Introduction to Solutions Lab

2008-03-27T10:59:00.000-07:00

The purpose of this lab was to determine if a sugar cube or small grains of sugar would dissolve faster. Before doing this experiment, we predicted that the small grains would dissolve faster. We made this prediction because the sugar grains are not together and the water molecules would have easier access to them. During our experiment we saw that when the two types of sugars were stirred in the water, that the grains dissolved much more quickly than the sugar cube. This occurred in all three of our trials. On average, the grains dissolved in 1.24 minutes and the cube took 1.58 minutes to dissolve.
The sugar cube probably dissolved less quickly because it was more tightly packed and the water molecules couldn’t get to all of the sugar molecules all at once. The grains dissolved faster because they had more surface area, which allowed more water molecules to surround the sugar and dissolve it. Some possible sources of error in this experiment were issues with starting and stopping the stopwatch, losing sugar when putting into the beaker, and changing the stirring rate while dissolving. These errors may have affected either the time it took to dissolve the sugar samples or the time that we recorded. If I tried to do this experiment again, I might try to standardize the amount of sugar we add more precisely, and perhaps create a machine that would stir the solutions at an equal rate.

Answers and Equations for "Stoichiometry and Percent Yield Practice"

2008-03-06T09:15:00.000-08:00

2. Correct Formula: 2K + 2H₂O --> 2KOH + H₂
Answer: a. 1.25 mol H₂
b. 83%

3. Correct Formula: 3CO + Fe₂O₃ --> 2Fe + 3CO₂
Answer: a. 365.2 g Fe
b. 82%

4. Correct Formula: Ca + Cl₂ --> CaCl₂
Answer: 3.20 mol Cl₂

5. Correct Formula: 2KI + Br₂ --> 2KBr + I₂
Answer: 41.2 g Br₂

Single and Double Displacement Reactions (5.2) 2/5/08

2008-02-05T15:55:00.001-08:00

Objective: SWBAT describe single and double displacement reactions

Agenda:

Toxins at Work

HW: Finish Toxins at Work HW

Balancing Equations (5.1) 2/4/08

2008-02-04T11:18:00.000-08:00

Objective: SWBAT balance a chemical equation

Agenda:

Finish Drawing Out Reactions
First Balancing Worksheet (download)

HW: Finish "First Balancing Worksheet"

Chemical Equations 1/24 Std 5.1

2008-01-24T11:17:00.000-08:00

Objective: SWBAT make predictions using chemical equations

Agenda:

Making Predictions
Making Predictions HW

HW: Making Predictions HW

Chemical Equations 1/23 Std 5.1

2008-01-23T11:15:00.000-08:00

Objective: SWBAT explain the parts of a chemical equation

Agenda:

Language of Change
Section Review #3 p 274

HW: Section review #3 p. 274

Molecular Formula 1/22 Std 5.4d

2008-01-22T11:28:00.000-08:00

Objective: SWBAT determine the molecular formula from the empirical formula.

Agenda:

Review Test Study Skills
Percent Composition and Empirical Formula Quiz
Notes: Empirical Formula
Problems: p. 249

HW: Read pages 248-249 and do practice problems and Section Review Problems 1-4.

Video Tutorial: Mole Mass Calculations

2008-01-17T15:32:00.000-08:00

Video Tutorial: Empirical Formula

2008-01-17T14:35:00.000-08:00

Empirical Formula

Video Tutorial: Percent Composition

2008-01-17T13:54:00.000-08:00

Percent Composition

After watching the video, try these Practice Problems. Answers are in [] for your reference:

NaCl [39.34% Na, 60.66% Cl]
(NH₄)₃PO₄ [28.19% N, 8.11% H, 20.77% P, 42.93% O]

Empirical Formula 1/15/08 Std 5.4c

2008-01-16T04:49:00.001-08:00

Objective: SWBAT determine the empirical formula of a substance.

Agenda:

Determining the Empirical Formula of Magnesium Oxide

HW: Finish Lab Analysis Questions

Percent Composition 1/10/08 Std 5.4b

2008-01-10T09:18:00.000-08:00

Objective: SWBAT determine percent composition of compounds

Agenda:

Notes: Percent Composition
Chewin' Through Chemistry

HW: Finish Chewin' Through Chemistry

Molar Mass 1/9/08 Std 5.4a

2008-01-10T09:15:00.000-08:00

Objective: SWBAT calculate the molar mass of substances

Agenda:

Gram Formula Mass
Moley Stations
Mole-Mass Calculations Quiz (Std 5.4a)

HW: Read pages 242-244 and do practice problems on page 244

Answers to Selected Mass-Mole Calculations

2008-01-08T11:59:00.000-08:00

Answers to Selected Gram Formula Mass problems.

5. 342 g Al₂(SO₄)₃
13. 304 g Ba(ClO₃)₂

Answers to Selected Moles and Mass Problems

4. 0.99 moles KCl
4. 19 g KCl

Molar Mass 1/8/08 Std 5.4a

2008-01-08T11:58:00.001-08:00

Objective: SWBAT calculate the molar mass of substances.

Agenda:

Notes: Mass-Mole Calculations
Gram Formula Mass
Moley Stations

HW: Complete Gram Formula Mass and Bring a Calculator!

Molar Mass 1/07/08 Std 5.4a

2008-01-07T11:45:00.000-08:00

Objective: SWBAT explain what molar mass is for a substance

Agenda:

Molehill of Pennies

HW: Finish Molehill of Pennies and prepare for Molar Mass Quiz

Chemical Formulas 1/1/08

2008-01-03T09:17:00.000-08:00

Objective: SWBAT describe the molar mass of a substance

Agenda:

Moley Stations Activity
Sample Questions G and H p. 239-240

HW: Sample Questions G and H p. 239-240 (Must Show all Work!)

Chemical Formulas 12/20/07 Std 4.7

2007-12-20T08:54:00.000-08:00

Objective: SWBAT name and write the formulas for ionic and covalent compounds.

Agenda:

Add on to notes
Practice Game
Nomenclature Practice

HW: Bring in one food product and at least one chemical formula from its ingredients.

Chemical Formulas 12/19/07 Std 4.7

2007-12-19T07:55:00.000-08:00

Objective: SWBAT name and give the formulas for ionic compounds.

Agenda:

Notes: Chemical Formulas and Names
Nomenclature: Ionic Compounds

HW: Read Section 1 Chapter 7

Determining Formulas of Ionic Compounds

2007-12-18T11:37:00.000-08:00

Intermolecular Forces Animation

2007-12-18T08:12:00.000-08:00

Chemical Bonding 12/18/07 Std 4.5

2007-12-18T08:03:00.000-08:00

Objective: SWBAT describe intermolecular forces\

Agenda:

Notes: Intermolecular Forces
Quiz: Intermolecular Forces

HW: Complete take home quiz by Thursday

Chemical Bonding 12/17/07 Std 4.4

2007-12-17T08:00:00.000-08:00

Objective: SWBAT practice determining shape and polarity of molecules.

Agenda:

Attractive Molecules
Shapes of Molecules

HW: Finish final draft of Attractive Molecules

You need to go into full detail about why water has its particular shape and why it is polar. Be specific.
Then explain why it was attracted to the charged rod. Once again, be specific!

VSEPR Theory Animation

2007-12-13T09:15:00.000-08:00

From Holt, Reinhart, and Winston's Modern Chemistry

Chemical Bonding 12/13/07 (Std 4.4)

2007-12-13T07:05:00.000-08:00

Objective: SWBAT determine if a molecule is polar.

Agenda:

Attractive Molecules Lab

HW: write up conclusion for today's lab

A good conclusion:

Restates the hypothesis (you answer to whether you thought water was going to be polar or not)
Describes the results of the lab
Uses the results to evaluate the hypothesis (relate what you observed to the hypothesis)

For this lab, your conclusions should relate the following concepts to the results that you observed:

VSEPR Theory
Geometry of the molecule (the shape)
Polarity and electronegativity

Lewis Dot Structure Tutorial

2007-12-12T16:05:00.000-08:00

If you need additional assistance (or practice) with Lewis Dot Structures, check out this video on the NASL method of drawing Lewis dot diagrams.

Download the written instructions and practice problems here.

Chemical Bonding 12/12/07 (Std 4.4)

2007-12-12T12:49:00.000-08:00

Objective: SWBAT demonstrate mastery on Standards 3.4, 4.1, 4.2 and design their own polarity experiment.

Agenda:

Standard 3.4, 4.1 and 4.2 Mastery Quiz
Attractive Molecules (download)

HW: Finish Attractive Molecules Prelab Writeup

Shapes of Molecules Examples

2007-12-11T18:50:00.000-08:00

Here are a couple of good examples of the Shapes of Molecules HW.

Chemical Bonding 12/11/07 (Std 4.4)

2007-12-11T12:52:00.001-08:00

Objective: SWBAT describe the shapes of molecules

Agenda:

Let's Build It (download)
Notes: Polar Bonds vs. Polar Molecules
Paragraph: Polar Molecules

HW: Paragraph: Explain why HF is polar and CO₂ is not.

Chemical Bonding 12/10/07 (Std 4.4)

2007-12-10T08:15:00.001-08:00

Objective: SWBAT describe the shapes of molecules

Agenda:

Notes: VSEPR Theory
Two's Company
Paragraph: Shapes of Molecules

HW:
Draw the shape of H₂S and name the shape and justify that shape using VSEPR Theory.

Chemical Bonding 12/7/07 (Std. 4.3)

2007-12-06T14:26:00.000-08:00

Objective: SWBAT use electronegativity to explain what kind of bond atoms will form.

Agenda:

Notes: Electronegativity and Bonding
Thinking Electronegatively (download)

HW: (beginning and developing mastery recommended) Read Section 6.1 of Modern Chemistry

Video: Electronegativity and Bonding

Chemical Bonding 12/6/07

2007-12-06T12:03:00.001-08:00

Objective: SWBAT analyze their own mistakes on yesterday's test

Agenda:

Assessment Mistake Analysis

HW: Analyze your mistakes and do test corrections

Chemical Bonding 12/6/07

2007-12-06T12:02:00.000-08:00

Objective: SWBAT demonstrate mastery of Standards 3.3, 3.4, 4.1 and 4.2 on a test

Agenda:

Standard 3.3, 3.4, 4.1 and 4.2 Test

HW: none

Chemical Bonding 12/4/07

2007-12-06T12:00:00.000-08:00

Objective: SWBAT predict how ionic and covalent compounds will behave

Agenda:

You Light Up My Life

HW: Study for Quiz

Chemical Bonding 12/3/07

2007-12-03T13:14:00.000-08:00

Objective: SWBAT explain how ionic and covalent compounds are different

Agenda:

Notes: Ionic vs. Covalent
Electron Glue
You Light Up My Life

HW: Read "You Light Up My Life" and make predictions about what will be soluble and what will conduct electricity.
Quiz Wednesday on Standards 3.3, 3.4.

Chemical Bonding 11/29/07

2007-11-28T15:24:00.000-08:00

Objective: SWBAT explain how ionic compounds form.

Agenda:

Finish Ionic Notes
Ionic Crystal Models
Lattice Energy and Bond Energy

HW: How is Lattice Energy in an ionic compound like Bond Energy in a covalent compound? Use formula unit vs. molecule and energy in your response!

Covalent Bonding 11/28/07

2007-11-28T11:33:00.000-08:00

Objective: SWBAT explain ionic bonding

Agenda:

Chapter Review p 209 #11
Notes: Ionic Bonding
Section Review p. 194

HW:

Section Review p. 194

Covalent Bonding 11/27/07

2007-11-27T08:57:00.001-08:00

Objective: SWBAT explain the characteristics of covalent bonds

Agenda:

NOTES: Ionic and Covalent Bonding

HW:

Chapter Review p 209 #11

Covalent Bonding 11/26/07

2007-11-27T08:55:00.000-08:00

Objective: SWBAT practice Lewis Dot Structures

Agenda:

Why Do Atoms form Covalent Bonds?

Why Do Atoms for Covalent Bonds? - Paragraph answer using page 179-181 of textbook.

Chemical Bonds 11/16

2007-11-16T09:03:00.000-08:00

Agenda:
-Review "What are Ionic and Covalent Bonds?"
-Review "Intro to Chemical Bonding"
-Polar Bears and Penguins
-Connect the Dots
-Notes: Ionic and Covalent Bonding

HW: None

Chemical Bonding 11/15

2007-11-14T15:29:00.001-08:00

Agenda:

What are Ionic and Covalent Bonding?
Introduction to Chemical Bonding
Polar Bears and Penguins

HW:

Polar Bears and Penguins

Periodic Trends 11/14

2007-11-14T12:33:00.000-08:00

Quiz on Periodic Trends.

Tomorrow, we start learning about how atoms bond!

Mr. Tran's Chemistry Class

Finals Study Guide

Heating Curves and Phase Diagrams

Heating Curve for Water

pH and Titrations Review Problems

Neutralization Reactions and Part of Drip Drop

Self-Guided Practice on pH problems

Online HW Assignment Website

Weak vs Strong Acids

What Does Dissolving Look Like?

Gas Law Problems - Answers

Creating ID for Online HW

Answers to Selected Questions from "Writing Chemical Equations"

Tutorial: Empirical Formula

List of Polyatomic Ions

Bonding Project Example

Covalent and Ionic Bonding Tutorial

Periodic Trends Practice

Unit 3 Test Study Guide Activity

Selected Answers to Atomic Structure WS

Reading on Atomic Theory

Melting Point and Boiling Point

Answer to Selected Density WS II Questions

The First 20 Elements

Answers to Selected Dimensional Analysis Practice Questions

Dimensional Analysis Project Links

Scientific Notation and Significant Figures Worksheet Answers

Table of Contents

Example Conclusion from Introduction to Solutions Lab

Answers and Equations for "Stoichiometry and Percent Yield Practice"

Single and Double Displacement Reactions (5.2) 2/5/08

Balancing Equations (5.1) 2/4/08

Chemical Equations 1/24 Std 5.1

Chemical Equations 1/23 Std 5.1

Molecular Formula 1/22 Std 5.4d

Video Tutorial: Mole Mass Calculations

Video Tutorial: Empirical Formula

Video Tutorial: Percent Composition

Empirical Formula 1/15/08 Std 5.4c

Percent Composition 1/10/08 Std 5.4b

Molar Mass 1/9/08 Std 5.4a

Answers to Selected Mass-Mole Calculations

Molar Mass 1/8/08 Std 5.4a

Molar Mass 1/07/08 Std 5.4a

Chemical Formulas 1/1/08

Chemical Formulas 12/20/07 Std 4.7

Chemical Formulas 12/19/07 Std 4.7

Determining Formulas of Ionic Compounds

Intermolecular Forces Animation

Chemical Bonding 12/18/07 Std 4.5

Chemical Bonding 12/17/07 Std 4.4

VSEPR Theory Animation

Chemical Bonding 12/13/07 (Std 4.4)

Lewis Dot Structure Tutorial

Chemical Bonding 12/12/07 (Std 4.4)

Shapes of Molecules Examples

Chemical Bonding 12/11/07 (Std 4.4)

Chemical Bonding 12/10/07 (Std 4.4)

Chemical Bonding 12/7/07 (Std. 4.3)

Chemical Bonding 12/6/07

Chemical Bonding 12/6/07

Chemical Bonding 12/4/07

Chemical Bonding 12/3/07

Chemical Bonding 11/29/07

Covalent Bonding 11/28/07

Covalent Bonding 11/27/07

Covalent Bonding 11/26/07

Chemical Bonds 11/16

Chemical Bonding 11/15

Periodic Trends 11/14