posted May 25, 2010 11:48 AM by Chas Thomsen
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updated May 27, 2010 2:13 PM
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Warm-up:How does your body use your organic molecule? Or why does your body use your metabolic process?
So, up to this point you have identified your topic, outlined your presentation, created a rough draft of both your quiz and your homework assignment. Two days ago (Tuesday) you are going to do some more research, because just using the book is not enough. By the end of the period, I will check off you assignment sheet when you show me 5 websites, and the information that you found there. We will in the computer lab for the rest of the week, so you can work on the rest of the weeks material as well.
Yesterday (Wednesday), I will check off a completed draft of your homework assignment, and on
Today (Thursday) I will check off a completed version of the quiz.
Remember that you are to be "experts" on your specific topic. Be prepared to answer questions about your presentation, and don't present things you yourself don't understand.
Our first presentation will be on Friday!
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posted May 24, 2010 12:57 PM by Chas Thomsen
and all i got were these awesome photos!
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posted May 18, 2010 3:23 PM by Chas Thomsen
Warm-up: What type of organic molecule do you consume when you are on the atkins diet? What type of organic molecule do you avoid?
Today's Activity:
today you are going to do some research into your topic. some things that you can look up are:
- Describe the function of the organic molecule.
- Describe the structure of the molecules.
- How are they made?
- What type of reactions do they undergo?
- How are each of them made in your body, and in the world?
- Identify the building block that make up your molecule?
- Compare and contrast your molecule with the other organic molecules.
- Why is your organic molecule important?
Remember to think about how you are going to present, and keep track what resources you use as you will have to turn in a bibliography. At the end of the period I will check off at lease two Internet resources that you find. cheers, t |
posted May 4, 2010 8:30 PM by Chas Thomsen
I saw some of Ms. Kapoor's students walking around with this yesterday. Its the perfect combination of cornstarch and water. Its a liquid and a solid. This is what happens when you put it in the cone of a speaker. |
posted Apr 27, 2010 9:03 PM by Chas Thomsen
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updated Apr 28, 2010 1:01 PM
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Warm-up: Write the combustion reaction for 3,5-diethyl-2,2,3,5-tetramethyloctane.
So we know how the name alkanes. Now we learn how to name organic molecules where all the bonds aren’t just single bonds, where there may be double or triple bonds... come on, it’ll be fun! Naming Alkenes of the form CnH2n: (ignore the stuff about alkenes as a substituent, and non-IUPAC alkenes)
After reviewing the website above, try your hand at drawing the following (include all the H's) and write their condensed structural formula on a separate sheet of paper. 1) 2-methyl-1-butene 2) 4-methyl-2-hexene 3) 4-isopropyl-3-octene 4) 3-chloro-4-methyl-1-pentene 5) 1-butene 6) 2-butene Alkynes are similar to alkenes but with a triple bond. Draw the following (including all the H's) and write their condensed structural formula.: 7) 3-methyl-1-butyne 8) 4-methyl-2-hexyne 9) 2-isopropyl-3-octyne 10) 3-chloro-4-methyl-1-pentyne 11) 1-butyne 12) 2-butyne If you finish these, you can start doing a little review for the STAR test week after next. Click on the following link, then skip to page 9 on that page and answer the questions you find there. cheers folks t |
posted Apr 27, 2010 8:44 PM by Chas Thomsen
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updated Apr 28, 2010 2:25 PM
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Warm-up:
Use the information you have about ohms law to complete the table that follows:
Battery
Voltage | Resistance | Current |
|---|
| 1.5V | 3ohms | ? |
| 3.0V | ? | 1amp |
| 4.5V | 3ohms | ? |
| ? | 6ohms | 0.25amp |
| 6.0V | ? | 0.2amps |
| ? | 12ohms | 0.5amp |
PART I. SERIES AND PARALLEL CIRCUITS
An electric circuit is formed when a conductive path is created to allow free electrons to continuously move. This continuous movement of free electrons through the conductors of a circuit is called a current, and it is often referred to in terms of "flow," just like the flow of a liquid through a hollow pipe.
What drives current? We can think of various devices such as batteries or generators which are necessary to maintain a current. All such devices create a potential difference or voltage.
When a voltage source is connected to a conductor, it applies a potential difference that creates an electric field. The electric field in turn exerts force on charges, causing current. .
Free electrons tend to move through conductors with some degree of friction, or opposition to motion. This opposition to motion is more properly called resistance. The amount of current in a circuit depends on the amount of voltage available to motivate the electrons, and also the amount of resistance in the circuit to oppose electron flow. Ohm’s Law relates these three quantities in a meaningful way.
The two simplest ways of connecting resistors are in series and parallel. Resistors are in series whenever current must flow through them sequentially. Resistors are in parallel when each resistor is connected directly to the voltage source.
2. For both types of circuits answer the following three question: a) As the number of resistors (light bulbs) increases, what happens to the overall current within the circuit?
b) As the number of resistors (light bulbs) increases, what happens to the overall resistance within the circuit?
c) If one of the resistors is turned off (i.e., a light bulb goes out), what happens to the other resistors (light bulbs) in the circuit? Do they remain on (i.e., lit)?
3. In a Series circuit, how do you calculate the equivalent resistance of a set of resistors? How do you calculate the total current? How do you calculate the total voltage drop across all the resistors? 4. In a Parallel circuit, how do you calculate the total current, the equivalent resistance and the voltage drop across the resistors? 5. Have a look at combination circuits. What's a combination circuit you say. Simply, its a "combination" of series and parallel circuits... duh! Follow the examples and see if you can answer the Check your Understanding question #3.
PART II. DC VOLTMETERS AND AMMETERS
Any device used to detect an electric current is called a galvanometer. Many important DC measuring instruments use a galvanometer as an indicating element. Two of the most common are the voltmeter and the ammeter.
6. Explain what a voltmeter measures and why it must be connected in a specific manner in a DC circuit.
7. Explain what an ammeter measures and why it must be connected in a specific manner in a DC circuit.
Time for some Ohm’s Law Practice. Solve as many of these problems as you can during the time given. Cheers
t |
posted Apr 21, 2010 1:01 PM by Chas Thomsen
4/19/10 Read 20.1-20.2 do problems 9, 10, 12, 13
4/20/10 Read 21.1 do 1, 2, 3, 6, 7
4/21/10 read 21.2 do 16, 17, 27
4/22/10 Review chapter 21 do #43, 44, 51, 66
4/23/10 Review chapter 21 do #67, 68, 84
4/26/10 Read 22.1 do #6-11
4/27/10 Read 22.1 do #1-5
4/28/10 Read 22.2 do #28-31
4/29/10 Review Chapter 22 do #61, 65, 66, 72
4/30/10 Review Chapter 22 do #73, 74, 82, 83, 88
Homework due on Monday May 3rd
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posted Apr 20, 2010 9:04 PM by Chas Thomsen
Warm-up:
What is the name of the molecule in the picture.
First start by answering the 12 question on THIS Page. And the 10 question on This Page, if you have time.
When you are done turn, turn in your work to me
cheers
t
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posted Apr 20, 2010 8:40 PM by Chas Thomsen
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updated Apr 21, 2010 10:02 AM
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Warm-up: Two charged particles one with charge 1.6x10-2 and the other -3.2x10-3 are separated by 10 cm. What is the force exerted by the positive charge on the negative one? What is the force from the negative one on the positive?
1. At the following website, click on “Physlets in the Second Semester,” a) Click on “Charge” - What are the direction of the forces between the three sets of particles.
b) Click on “Four Charges” - What are the charges of the four particles?
c) Click on “Conservation of Charge” - What is the charge of the two spheres after you run the experiment?
d) Click on “Coulomb’s Law” - Draw the graph of force vs. distance. What kind of graph is it?
e) Click on “the Magnitude of the Force Between Charges” - What is the difference in the force experienced when you switch from “Q and 2Q” to
“2Q and Q?”
f) Click on “Coulomb’s Law in 1-D” - Answer the two question on the page.
g) Click on “Coulomb’s Law in 2-D” - In each of the three configurations, determine the charge of the charges 1-4.
Let’s start with Electric Fields:
2) How is the direction of the electric field defined? (If you don't trust Wikipedia, feel free to look it up elsewhere) What does this mean for a positive charge, and for a negative charge? 3) Draw the electric field around a single positive charge?
4) Draw the field around a single negative charge?
5) Draw or describe the field around two charges, one positive and one negative?
6) Check your answer. Follow the directions on This Page to check your work. Start by unchecking all check boxes. Once you have placed your charges, click the middle check box to show the electric field lines. Now place four different charges on the board, what does the electric field look like?
7) Draw or describe the field around two unequal, unlike charges. Move the two charges around. Can you make the test charge orbit around the other charges? Draw the successful diagram.
Cheers,
t
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posted Apr 19, 2010 12:23 PM by Chas Thomsen
4/19/10 Read 22.1 do #1-8
4/20/10 Read 22.1 do #37-43, 61, 62
4/21/10 Read 23.1 do 1, 2, 4(a, b, c), 9, 47(b, e), 49(a, b, d)
4/22/10 Do Problem Set #1
4/23/10 Do Problems Set #2
4/26/10 Read 22.2 do # 10-13, 15, 62, 64
4/27/10 Read 22.3 do 1-22
4/28/10 Read 22.4 do #24-26, 30-33, 55, 56, 73
4/29/10 Do Problem Set #3
4/30/10 Do Problems Set 4 #18-20
5/3/10 Do Problems Set 4 #1-10
5/4/10 Do Problems Set 4 #11-17
Review for Test on Thursday 5/6/10
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