Friday, January 30, 2009
the latest gadget 2009
http://blog.gadgetlite.com/ As we can see almost of our equipment are very hightech, all invetion now are fantastic, trough the latest gadget it help to the people to make them work easy.
Computer Ethics
http://library.thinkquest.org/26658/
the computer ethics it hepls the people to improve their knowlleged of how to use the computer.
Example: Information of teachers.
the computer ethics it hepls the people to improve their knowlleged of how to use the computer.
Example: Information of teachers.
Thursday, January 29, 2009
chemistry
Welcome to the ChemTeam
A Tutorial for High School Chemistry
The ChemTeam provides study resources in all standard topics for students in high school and Advanced Placement chemistry.
Please do not e-mail the ChemTeam with requests to help you with your homework or to tell me a particular section isn't done. PLEASE DON'T.
"A good teacher is one who can understand those who are not very good at explaining,and explain to those who are not very good at understanding." -- Dwight D. Eisenhower
"Never say, 'I tried it once and it did not work.'" -- Ernest Rutherford
Acid Base
Atomic Structure: Democritus to Aston
Bonding & Isomerism
Chemical Equations & Reaction Types
Electrochemistry
Electrons in Atoms & Spectroscopy (Text Chap. 11)
Electron Configurations & Very Simple QM
Equilibrium
Kinetic Molecular Theory & Gas Laws
Matter, PhysicalProperties, etc.
The Mole
Nomenclature
Organic Chemistry
Periodic Properties
Kinetics
Metric System
Radioactivity
Reduction Oxidation
Significant Figures & Scientific Notation
Solutions, Concentration &Colligative Properties
Stoichiometry
Thermochemistry
Thermodynamics
VSEPR
California High SchoolChemistry Standards
Classic Papers
A Collection of SayingsA Collection of Latin Sayings
Photo Gallery
Humor
Sites with Test Questions of Possible Interest to Chemistry Teachers and Students
Contact the ChemTeam
There are many files on this site which use Adobe Acrobat. Click the image to go to the Adobe site and download the free reader software. If you don't know how to install the software, ask someone who does know to help you.
Some chemistry help suggestions:
Wilton High School's Chemistry Tutorial List.
Chemistry Resources by Audrey Sanderson.
Some AP Chemistry help suggestions:
Some digital textbook chapters on basic chemistry topics like acid base, equilibrium and the like
Some links more oriented to AP Chemistry
Some physics help suggestions for the future:
College Physics for Students of Biology and Chemistry
Students, The Parable of the Pebbles makes an important point about education. Please take a moment to look at it. You may also enjoy Life's Little Instruction Book.
Copyright © 1996-2004 by John L. Park
Click here
A Tutorial for High School Chemistry
The ChemTeam provides study resources in all standard topics for students in high school and Advanced Placement chemistry.
Please do not e-mail the ChemTeam with requests to help you with your homework or to tell me a particular section isn't done. PLEASE DON'T.
"A good teacher is one who can understand those who are not very good at explaining,and explain to those who are not very good at understanding." -- Dwight D. Eisenhower
"Never say, 'I tried it once and it did not work.'" -- Ernest Rutherford
Acid Base
Atomic Structure: Democritus to Aston
Bonding & Isomerism
Chemical Equations & Reaction Types
Electrochemistry
Electrons in Atoms & Spectroscopy (Text Chap. 11)
Electron Configurations & Very Simple QM
Equilibrium
Kinetic Molecular Theory & Gas Laws
Matter, PhysicalProperties, etc.
The Mole
Nomenclature
Organic Chemistry
Periodic Properties
Kinetics
Metric System
Radioactivity
Reduction Oxidation
Significant Figures & Scientific Notation
Solutions, Concentration &Colligative Properties
Stoichiometry
Thermochemistry
Thermodynamics
VSEPR
California High SchoolChemistry Standards
Classic Papers
A Collection of SayingsA Collection of Latin Sayings
Photo Gallery
Humor
Sites with Test Questions of Possible Interest to Chemistry Teachers and Students
Contact the ChemTeam
There are many files on this site which use Adobe Acrobat. Click the image to go to the Adobe site and download the free reader software. If you don't know how to install the software, ask someone who does know to help you.
Some chemistry help suggestions:
Wilton High School's Chemistry Tutorial List.
Chemistry Resources by Audrey Sanderson.
Some AP Chemistry help suggestions:
Some digital textbook chapters on basic chemistry topics like acid base, equilibrium and the like
Some links more oriented to AP Chemistry
Some physics help suggestions for the future:
College Physics for Students of Biology and Chemistry
Students, The Parable of the Pebbles makes an important point about education. Please take a moment to look at it. You may also enjoy Life's Little Instruction Book.
Copyright © 1996-2004 by John L. Park
Click here
Chem team
Welcome to the ChemTeam
A Tutorial for High School Chemistry
The ChemTeam provides study resources in all standard topics for students in high school and Advanced Placement chemistry.
Please do not e-mail the ChemTeam with requests to help you with your homework or to tell me a particular section isn't done. PLEASE DON'T.
"A good teacher is one who can understand those who are not very good at explaining,and explain to those who are not very good at understanding." -- Dwight D. Eisenhower
"Never say, 'I tried it once and it did not work.'" -- Ernest Rutherford
Acid Base
Atomic Structure: Democritus to Aston
Bonding & Isomerism
Chemical Equations & Reaction Types
Electrochemistry
Electrons in Atoms & Spectroscopy (Text Chap. 11)
Electron Configurations & Very Simple QM
Equilibrium
Kinetic Molecular Theory & Gas Laws
Matter, PhysicalProperties, etc.
The Mole
Nomenclature
Organic Chemistry
Periodic Properties
Kinetics
Metric System
Radioactivity
Reduction Oxidation
Significant Figures & Scientific Notation
Solutions, Concentration &Colligative Properties
Stoichiometry
Thermochemistry
Thermodynamics
VSEPR
California High SchoolChemistry Standards
Classic Papers
A Collection of SayingsA Collection of Latin Sayings
Photo Gallery
Humor
Sites with Test Questions of Possible Interest to Chemistry Teachers and Students
Contact the ChemTeam
There are many files on this site which use Adobe Acrobat. Click the image to go to the Adobe site and download the free reader software. If you don't know how to install the software, ask someone who does know to help you.
Some chemistry help suggestions:
Wilton High School's Chemistry Tutorial List.
Chemistry Resources by Audrey Sanderson.
Some AP Chemistry help suggestions:
Some digital textbook chapters on basic chemistry topics like acid base, equilibrium and the like
Some links more oriented to AP Chemistry
Some physics help suggestions for the future:
College Physics for Students of Biology and Chemistry
Students, The Parable of the Pebbles makes an important point about education. Please take a moment to look at it. You may also enjoy Life's Little Instruction Book.
Copyright © 1996-2004 by John L. Park
Click here
A Tutorial for High School Chemistry
The ChemTeam provides study resources in all standard topics for students in high school and Advanced Placement chemistry.
Please do not e-mail the ChemTeam with requests to help you with your homework or to tell me a particular section isn't done. PLEASE DON'T.
"A good teacher is one who can understand those who are not very good at explaining,and explain to those who are not very good at understanding." -- Dwight D. Eisenhower
"Never say, 'I tried it once and it did not work.'" -- Ernest Rutherford
Acid Base
Atomic Structure: Democritus to Aston
Bonding & Isomerism
Chemical Equations & Reaction Types
Electrochemistry
Electrons in Atoms & Spectroscopy (Text Chap. 11)
Electron Configurations & Very Simple QM
Equilibrium
Kinetic Molecular Theory & Gas Laws
Matter, PhysicalProperties, etc.
The Mole
Nomenclature
Organic Chemistry
Periodic Properties
Kinetics
Metric System
Radioactivity
Reduction Oxidation
Significant Figures & Scientific Notation
Solutions, Concentration &Colligative Properties
Stoichiometry
Thermochemistry
Thermodynamics
VSEPR
California High SchoolChemistry Standards
Classic Papers
A Collection of SayingsA Collection of Latin Sayings
Photo Gallery
Humor
Sites with Test Questions of Possible Interest to Chemistry Teachers and Students
Contact the ChemTeam
There are many files on this site which use Adobe Acrobat. Click the image to go to the Adobe site and download the free reader software. If you don't know how to install the software, ask someone who does know to help you.
Some chemistry help suggestions:
Wilton High School's Chemistry Tutorial List.
Chemistry Resources by Audrey Sanderson.
Some AP Chemistry help suggestions:
Some digital textbook chapters on basic chemistry topics like acid base, equilibrium and the like
Some links more oriented to AP Chemistry
Some physics help suggestions for the future:
College Physics for Students of Biology and Chemistry
Students, The Parable of the Pebbles makes an important point about education. Please take a moment to look at it. You may also enjoy Life's Little Instruction Book.
Copyright © 1996-2004 by John L. Park
Click here
Chemistry tutorial in water
Chemistry Tutorial
The Chemistry of Water The polarity of water
Water has a simple molecular structure. It is composed of one oxygen atom and two hydrogen atoms. Each hydrogen atom is covalently bonded to the oxygen via a shared pair of electrons. Oxygen also has two unshared pairs of electrons. Thus there are 4 pairs of electrons surrounding the oxygen atom, two pairs involved in covalent bonds with hydrogen, and two unshared pairs on the opposite side of the oxygen atom. Oxygen is an "electronegative" or electron "loving" atom compared with hydrogen.
Water is a "polar" molecule, meaning that there is an uneven distribution of electron density. Water has a partial negative charge () near the oxygen atom due the unshared pairs of electrons, and partial positive charges () near the hydrogen atoms.
An electrostatic attraction between the partial positive charge near the hydrogen atoms and the partial negative charge near the oxygen results in the formation of a hydrogen bond as shown in the illustration.
The ability of ions and other molecules to dissolve in water is due to polarity. For example, in the illustration below sodium chloride is shown in its crystalline form and dissolved in water.
Many other unique properties of water are due to the hydrogen bonds. For example, ice floats because hydrogen bonds hold water molecules further apart in a solid than in a liquid, where there is one less hydrogen bond per molecule. The unique physical properties, including a high heat of vaporization, strong surface tension, high specific heat, and nearly universal solvent properties of water are also due to hydrogen bonding. The hydrophobic effect, or the exclusion of compounds containing carbon and hydrogen (nonpolar compounds) is another unique property of water caused by the hydrogen bonds. The hydrophobic effect is particularly important in the formation of cell membranes. The best description is to say that water "squeezes" nonpolar molecules together.
Acids and Bases, Ionization of Water
Acid release H+
Bases accept H+
We define the pH of a solution as the negative logarithm of the hydrogen ion concentration.
at pH 7.0, a solution is neutral
at lower pH (1-6), a solution is acidic
at higher pH (8-14), a solution is basic
The Biology Project Department of Biochemistry and Molecular Biophysics The University of Arizona Revised: January 28, 2003Contact the Development Team
http://www.biology.arizona.edu All contents copyright © 1997-2003. All rights reserved.
The Chemistry of Water The polarity of water
Water has a simple molecular structure. It is composed of one oxygen atom and two hydrogen atoms. Each hydrogen atom is covalently bonded to the oxygen via a shared pair of electrons. Oxygen also has two unshared pairs of electrons. Thus there are 4 pairs of electrons surrounding the oxygen atom, two pairs involved in covalent bonds with hydrogen, and two unshared pairs on the opposite side of the oxygen atom. Oxygen is an "electronegative" or electron "loving" atom compared with hydrogen.
Water is a "polar" molecule, meaning that there is an uneven distribution of electron density. Water has a partial negative charge () near the oxygen atom due the unshared pairs of electrons, and partial positive charges () near the hydrogen atoms.
An electrostatic attraction between the partial positive charge near the hydrogen atoms and the partial negative charge near the oxygen results in the formation of a hydrogen bond as shown in the illustration.
The ability of ions and other molecules to dissolve in water is due to polarity. For example, in the illustration below sodium chloride is shown in its crystalline form and dissolved in water.
Many other unique properties of water are due to the hydrogen bonds. For example, ice floats because hydrogen bonds hold water molecules further apart in a solid than in a liquid, where there is one less hydrogen bond per molecule. The unique physical properties, including a high heat of vaporization, strong surface tension, high specific heat, and nearly universal solvent properties of water are also due to hydrogen bonding. The hydrophobic effect, or the exclusion of compounds containing carbon and hydrogen (nonpolar compounds) is another unique property of water caused by the hydrogen bonds. The hydrophobic effect is particularly important in the formation of cell membranes. The best description is to say that water "squeezes" nonpolar molecules together.
Acids and Bases, Ionization of Water
Acid release H+
Bases accept H+
We define the pH of a solution as the negative logarithm of the hydrogen ion concentration.
at pH 7.0, a solution is neutral
at lower pH (1-6), a solution is acidic
at higher pH (8-14), a solution is basic
The Biology Project Department of Biochemistry and Molecular Biophysics The University of Arizona Revised: January 28, 2003Contact the Development Team
http://www.biology.arizona.edu All contents copyright © 1997-2003. All rights reserved.
Oragnic chemistry tutorial
chemhelper.com
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Tutorial :: Working Multistep Synthesis Problems (Updated 7/26/05)
This guide presents some tips for working multistep synthesis problems.
Quick 'n Dirty Problem Help Guides ------------------------------------------------------------------------------------------------
Quick 'n Dirty Guide :: Comparing acidities of organic molecules by structure
Quick 'n Dirty Guide :: Drawing alkane isomers given a molecular formula
Quick 'n Dirty Guide ::: Determining degrees of unsaturation from a structure or formula
Quick 'n Dirty Guide ::: Calculating formal charges on atoms
Quick 'n Dirty Guide :: Naming bicyclic alkanes
Quick 'n Dirty Guide :: Naming alkanes
Quick 'n Dirty Guide :: Assigning R & S stereochemistry to chiral centers
Quick 'n Dirty Guide :: Seeing electronegativity effects
The Drunken Kekule Series:---------------------------------------------------------------------------Coming soon!
Chemhelper.com's very own Ignatius von Kekule guides you through various topics in these interactive tutorials. Opens in a popup browser so you may have to temporarily disable any popup killers. Warning: Kekule tends to get a bit abusive when he's had a little too much to drink. Don't take any insults or crass comments personally.
Naming alkanes
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Home email: chemhelper@gmail.com
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site navigation --------------------------
tutorials
mechanisms
practice tests
laboratory help
message board
odds & ends
site info---------------------------
site info
fsu chemistry
site search AllAny
organic chemistry tutorials > home
General Tutorials-----------------------------------------------
Tutorial :: Working Multistep Synthesis Problems (Updated 7/26/05)
This guide presents some tips for working multistep synthesis problems.
Quick 'n Dirty Problem Help Guides ------------------------------------------------------------------------------------------------
Quick 'n Dirty Guide :: Comparing acidities of organic molecules by structure
Quick 'n Dirty Guide :: Drawing alkane isomers given a molecular formula
Quick 'n Dirty Guide ::: Determining degrees of unsaturation from a structure or formula
Quick 'n Dirty Guide ::: Calculating formal charges on atoms
Quick 'n Dirty Guide :: Naming bicyclic alkanes
Quick 'n Dirty Guide :: Naming alkanes
Quick 'n Dirty Guide :: Assigning R & S stereochemistry to chiral centers
Quick 'n Dirty Guide :: Seeing electronegativity effects
The Drunken Kekule Series:---------------------------------------------------------------------------Coming soon!
Chemhelper.com's very own Ignatius von Kekule guides you through various topics in these interactive tutorials. Opens in a popup browser so you may have to temporarily disable any popup killers. Warning: Kekule tends to get a bit abusive when he's had a little too much to drink. Don't take any insults or crass comments personally.
Naming alkanes
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