Covalent Bonding Tutorial
http://www.teachersdomain.org/asset/lsps07_int_covalentbond/
Ionic Bonding Tutorial
http://www.teachersdomain.org/asset/lsps07_int_ionicbonding/
Tuesday, December 2, 2008
Monday, November 17, 2008
Thursday, October 30, 2008
Unit 3 Test Study Guide Activity
Tomorrow's test will cover the standards listed on the Unit 3 - Study Guide.
Each group will need to do the following:
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.
Monday, October 20, 2008
Selected Answers to Atomic Structure WS
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
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
Wednesday, October 15, 2008
Monday, October 6, 2008
Friday, October 3, 2008
Answer to Selected Density WS II Questions
3. 7.68 g/cc
5. 3.17 g/ml
7. 0.0081 g/cc; yes it will float.
5. 3.17 g/ml
7. 0.0081 g/cc; yes it will float.
The First 20 Elements
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
http://periodic.lanl.gov/default.htm
Monday, September 22, 2008
Answers to Selected Dimensional Analysis Practice Questions
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
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
Wednesday, September 17, 2008
Dimensional Analysis Project Links
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!
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!
Thursday, September 11, 2008
Scientific Notation and Significant Figures Worksheet Answers
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.
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.
Friday, April 18, 2008
Thursday, March 27, 2008
Example Conclusion from Introduction to Solutions Lab
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.
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.
Thursday, March 6, 2008
Answers and Equations for "Stoichiometry and Percent Yield Practice"
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
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
Tuesday, February 5, 2008
Single and Double Displacement Reactions (5.2) 2/5/08
Objective: SWBAT describe single and double displacement reactions
Agenda:
HW: Finish Toxins at Work HW
Agenda:
- Toxins at Work
HW: Finish Toxins at Work HW
Monday, February 4, 2008
Balancing Equations (5.1) 2/4/08
Objective: SWBAT balance a chemical equation
Agenda:
HW: Finish "First Balancing Worksheet"
Agenda:
- Finish Drawing Out Reactions
- First Balancing Worksheet (download)
HW: Finish "First Balancing Worksheet"
Thursday, January 24, 2008
Chemical Equations 1/24 Std 5.1
Objective: SWBAT make predictions using chemical equations
Agenda:
HW: Making Predictions HW
Agenda:
- Making Predictions
- Making Predictions HW
HW: Making Predictions HW
Wednesday, January 23, 2008
Chemical Equations 1/23 Std 5.1
Objective: SWBAT explain the parts of a chemical equation
Agenda:
HW: Section review #3 p. 274
Agenda:
- Language of Change
- Section Review #3 p 274
HW: Section review #3 p. 274
Tuesday, January 22, 2008
Molecular Formula 1/22 Std 5.4d
Objective: SWBAT determine the molecular formula from the empirical formula.
Agenda:
HW: Read pages 248-249 and do practice problems and Section Review Problems 1-4.
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.
Thursday, January 17, 2008
Video Tutorial: Percent Composition
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]
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]
Wednesday, January 16, 2008
Empirical Formula 1/15/08 Std 5.4c
Objective: SWBAT determine the empirical formula of a substance.
Agenda:
HW: Finish Lab Analysis Questions
Agenda:
- Determining the Empirical Formula of Magnesium Oxide
HW: Finish Lab Analysis Questions
Thursday, January 10, 2008
Percent Composition 1/10/08 Std 5.4b
Objective: SWBAT determine percent composition of compounds
Agenda:
Agenda:
- Notes: Percent Composition
- Chewin' Through Chemistry
HW: Finish Chewin' Through Chemistry
Molar Mass 1/9/08 Std 5.4a
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
Tuesday, January 8, 2008
Answers to Selected Mass-Mole Calculations
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
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
Objective: SWBAT calculate the molar mass of substances.
Agenda:
Agenda:
- Notes: Mass-Mole Calculations
- Gram Formula Mass
- Moley Stations
HW: Complete Gram Formula Mass and Bring a Calculator!
Monday, January 7, 2008
Molar Mass 1/07/08 Std 5.4a
Objective: SWBAT explain what molar mass is for a substance
Agenda:
HW: Finish Molehill of Pennies and prepare for Molar Mass Quiz
Agenda:
- Molehill of Pennies
HW: Finish Molehill of Pennies and prepare for Molar Mass Quiz
Thursday, January 3, 2008
Chemical Formulas 1/1/08
Objective: SWBAT describe the molar mass of a substance
Agenda:
HW: Sample Questions G and H p. 239-240 (Must Show all Work!)
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!)
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