Monday, December 17, 2007
Monday, December 10, 2007
Tuesday, November 13, 2007
Wednesday, November 7, 2007
CHEMISTRY: Quantum Model of the Atom
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Check out this great tutorial about the Quantum Atom!
(This is the one with the light gun and machine gun through the slits)
Also, here is a link to the machine that makes the crazy wave patterns, it is
known as a vibrating Chladni Plate
Tuesday, November 6, 2007
Monday, November 5, 2007
Monday, October 29, 2007
CHEMISTRY: Bohr Model ppt
Use the diagram on the second to last slide for part 1 of the worksheet. The "names" should be Lyman, Balmer and Paschen. The "Region of EM Spectrum" should be the span of kJ emitted by the group. For Paschen, look at the longest arrow above his name: the region his group spans is from -146 kJ to 0 kg. Use the arrows to find the span of Lyman and Balmer groups.
Use the diagram on the last slide to find the colors emitted by an excited hydrogen atom. Look at the four bars of color on the "Visible" part of the spectrum. The first bar is red, so write red under "color" column. Follow the arrow from the red bar to the maroon arrow which shows the movement of the electron from level 3 to level 2. In the "Transition" column write level 3 --> level 2. Do the same for the remaining three bars of color.
CHEMISTRY: Bohr Model Worksheet
If you missed class October 26, here is the worksheet you missed: Bohr Worksheet
Sunday, October 28, 2007
PHYSICS: Newton's Laws Reveiw
Key: 1(d) 2(b) 3(b) 4(c) 5(c) 6(a) 7(b) 8(c) 9(c) 10(b)
11(c) 12(a) 13(5N) 14(c) 15(b) 16(a) 17(b) 18(6000N) 19(c) 20(c)
21(a) 22(c) 23(b) 24(c) 25(c) 26(b) 27(a) 28(c) 29(c)
Saturday, October 27, 2007
PHYSICS: Powerpoint Jeopardy
The answer to the question about a ball dropped from a plane is actually 1280m; this question will be on the test as extra credit!
Thursday, October 25, 2007
CHEMISTRY: Waves and Particles Worksheet
Name_______________ Period_______ Date_______
Waves & Particles – Ch. 4
(p. 97 - 101)
1. In the diagrams below, which wave has the higher frequency? Explain.
2. Briefly describe what Planck and Einstein contributed to the concept of Quantum Theory.
3. One of the lines in the emission spectrum of sodium has a wavelength of 590 nm. What is the frequency of this line?
4. A radio station broadcasts at a frequency of 91.3 MHz (9.13 ´ 107 Hz). What is the wavelength of this EM wave?
5. Calculate the energy of a gamma ray photon with a frequency of 6.0 ´ 1022 Hz.
6. When an electron in a hydrogen atom drops from the fifth to the second energy level, 4.58 ´ 10-19 J of energy is released. Find the frequency of the photon that is produced.
7. Order the following regions of the EM spectrum from lowest to highest energy: infrared, microwaves, ultraviolet, visible red, visible green, X-rays.
For a more printable version Click Here
Adapted from: Mrs. J's Chemistry
Waves & Particles – Ch. 4
(p. 97 - 101)
1. In the diagrams below, which wave has the higher frequency? Explain.
2. Briefly describe what Planck and Einstein contributed to the concept of Quantum Theory.
3. One of the lines in the emission spectrum of sodium has a wavelength of 590 nm. What is the frequency of this line?
4. A radio station broadcasts at a frequency of 91.3 MHz (9.13 ´ 107 Hz). What is the wavelength of this EM wave?
5. Calculate the energy of a gamma ray photon with a frequency of 6.0 ´ 1022 Hz.
6. When an electron in a hydrogen atom drops from the fifth to the second energy level, 4.58 ´ 10-19 J of energy is released. Find the frequency of the photon that is produced.
7. Order the following regions of the EM spectrum from lowest to highest energy: infrared, microwaves, ultraviolet, visible red, visible green, X-rays.
For a more printable version Click Here
Adapted from: Mrs. J's Chemistry
Tuesday, October 23, 2007
CHEMISTRY: Molar Conversions
Trying to remember how to do these conversions:
moles ----> atoms
atoms ---> grams
grams ---> moles
Good News!
I found a great online tutorial All About Molar Calculations.
moles ----> atoms
atoms ---> grams
grams ---> moles
Good News!
I found a great online tutorial All About Molar Calculations.
CHEMISTRY: Counting Atoms Lab
October 15, 2007
Counting Atoms Lab
Problem: How can you best approximate the number of atoms in an object made up of one element.
Hypothesis: _______________________________________________
Materials: copper couplings, lead weights, aluminum rivets, scale.
Procedures:
1.) Select a number of pieces of each element and record how many you chose to weigh.
2.) Carefully weigh each element separately and record the mass of each element.
3.) Use the mass -----> moles conversion,
then use moles -----> number of atoms conversion to find the number of moles of each element and the approximate number of atoms contained in the objects.
Data:
Copper Couplings
-Number and types of pieces____________________________
-Mass of items selected___________________
-Moles of Copper____________________________
-Number of Copper atoms____________________
Aluminum Rivets
-Number of rivets_____________________
-Mass of rivets_____________________
-Moles of Aluminum___________________
-Number of Aluminum atoms_______________
Lead Weights
-Number of weights___________
-Mass of weights_____________
-Moles of Lead______________
-Number of Lead atoms_____________________
Counting Atoms Lab
Problem: How can you best approximate the number of atoms in an object made up of one element.
Hypothesis: _______________________________________________
Materials: copper couplings, lead weights, aluminum rivets, scale.
Procedures:
1.) Select a number of pieces of each element and record how many you chose to weigh.
2.) Carefully weigh each element separately and record the mass of each element.
3.) Use the mass -----> moles conversion,
then use moles -----> number of atoms conversion to find the number of moles of each element and the approximate number of atoms contained in the objects.
Data:
Copper Couplings
-Number and types of pieces____________________________
-Mass of items selected___________________
-Moles of Copper____________________________
-Number of Copper atoms____________________
Aluminum Rivets
-Number of rivets_____________________
-Mass of rivets_____________________
-Moles of Aluminum___________________
-Number of Aluminum atoms_______________
Lead Weights
-Number of weights___________
-Mass of weights_____________
-Moles of Lead______________
-Number of Lead atoms_____________________
Monday, October 22, 2007
Thursday, October 4, 2007
CHEMISTRY: Adopt an Atom
Please follow this basic format for your element, be creative, use color and whatever else, just make sure all the information is present and in the right place. You may do this by hand if you prefer, but please do so on plain paper (not lined).
Due Date: Tuesday, Oct. 9
Use this Periodic Table or other sources for your information.
More Periodic Tables:
Web Elements
Chemical Elements
Los Alamo
Or else, try searching Wikipedia (type in your element's name).
Due Date: Tuesday, Oct. 9
Use this Periodic Table or other sources for your information.
More Periodic Tables:
Web Elements
Chemical Elements
Los Alamo
Or else, try searching Wikipedia (type in your element's name).
Tuesday, October 2, 2007
CHEMISTRY: Atomic Structure ppt
Images taken from Jefferson Lab and Wikipedia
Check out Jefferson Lab's Periodic Table and the Student Zone!
PHYSICS: Gravity Lab
Materials:
3 pieces of paper
Pen or pencil
Procedure:
Sheet vs. Sheet
1. Take 2 of the pieces of paper, label them #1 and #2 as large as you want (you won't be writing anything else on them).
2. Hold paper #1 in one hand and #2 in the other arms out in front of you at about eye level. Making sure that they are the same distance from the ground, drop the two papers at the same time. Repeat 2 more times
Answer the following questions on a seperate piece of paper (or print this document):
Which sheet hit first, #1 or #2?
Was there any lateral motion (motion besides straight down)?
If repeated, would you be able to predict which paper would hit first?
Sheet vs. Ball
1. Crumple sheet #2 into a tight paper ball.
2. Repeat "Sheet vs. Sheet" step 2.
Which hit first, the ball or the sheet?
Was there any lateral motion (motion besides straight down)?
If repeated, would you be able to predict which paper would hit first?
Sheet Throw
1. Hold sheet #1 in your throwing hand.
2. Aim at a target about 10ft away.
3. Throw the sheet at your target.
Were you able to hit your target, why or why not?
Describe the motion of the paper, how did it compare with the drop?
Ball Throw
1. Repeat "Sheet Throw" steps 1-3 with the paper ball.
Were you able to hit your target, why or why not?
Describe the motion of the paper, how did it compare with the drop?
Which weighs more, the sheet or the ball?
Ball vs. Pencil/Pen
1. Repeat "Sheet vs. Sheet" step 2 with paper ball and a pencil or pen.
Which hit the ground first, the pencil/pen or the paper ball?
Was there any lateral motion?
Which weighs more?
Conclusion:
Why did it take longer for the sheet of paper to hit than the ball?
Why is it hard to hit your target with the sheet of paper?
Did you expect the pencil/pen to hit before the paper ball? Were you correct?
What assumptions about gravity can you make after completing this lab?
3 pieces of paper
Pen or pencil
Procedure:
Sheet vs. Sheet
1. Take 2 of the pieces of paper, label them #1 and #2 as large as you want (you won't be writing anything else on them).
2. Hold paper #1 in one hand and #2 in the other arms out in front of you at about eye level. Making sure that they are the same distance from the ground, drop the two papers at the same time. Repeat 2 more times
Answer the following questions on a seperate piece of paper (or print this document):
Which sheet hit first, #1 or #2?
Was there any lateral motion (motion besides straight down)?
If repeated, would you be able to predict which paper would hit first?
Sheet vs. Ball
1. Crumple sheet #2 into a tight paper ball.
2. Repeat "Sheet vs. Sheet" step 2.
Which hit first, the ball or the sheet?
Was there any lateral motion (motion besides straight down)?
If repeated, would you be able to predict which paper would hit first?
Sheet Throw
1. Hold sheet #1 in your throwing hand.
2. Aim at a target about 10ft away.
3. Throw the sheet at your target.
Were you able to hit your target, why or why not?
Describe the motion of the paper, how did it compare with the drop?
Ball Throw
1. Repeat "Sheet Throw" steps 1-3 with the paper ball.
Were you able to hit your target, why or why not?
Describe the motion of the paper, how did it compare with the drop?
Which weighs more, the sheet or the ball?
Ball vs. Pencil/Pen
1. Repeat "Sheet vs. Sheet" step 2 with paper ball and a pencil or pen.
Which hit the ground first, the pencil/pen or the paper ball?
Was there any lateral motion?
Which weighs more?
Conclusion:
Why did it take longer for the sheet of paper to hit than the ball?
Why is it hard to hit your target with the sheet of paper?
Did you expect the pencil/pen to hit before the paper ball? Were you correct?
What assumptions about gravity can you make after completing this lab?
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