; Inorganic chemistry : Inorganic chemistry is the branch of chemistry concerned with the properties and reactions of inorganic compounds. The distinction between organic and inorganic disciplines is not absolute and there is much overlap, most importantly in the sub-discipline of organometallic chemistry.
Nomenclature refers to the system for naming chemical compounds. There are well-defined systems in place for naming chemical species. Organic compounds are named according to the organic nomenclature system. Inorganic compounds are named according to the inorganic nomenclature system.
An element is a material that consists of atoms with a given number of protons in the nucleus. This number is known as the atomic number of the element. For example, all atoms with 6 protons in their nuclei are atoms of the chemical element carbon, and all atoms with 92 protons in their nuclei are atoms of the element uranium.
The most convenient presentation of the elements is in the periodic table, which groups elements with similar chemical properties together. Lists of the elements by name, by symbol, and by atomic number are also available.
A compound is a substance formed from two or more elements, with a fixed ratio determining the composition. For example, water is a compound containing hydrogen and oxygen in the ratio of two to one. Compounds are formed and decomposed by chemical reactions.
A chemical bond is the force which holds together atoms in molecules or crystals. In many simple compounds, valence bond theory and the concept of oxidation number can be used to predict molecular structure and composition. Similarly, theories from classical physics can be used to predict many ionic structures. With more complicated compounds, such as metal complexes, valence bond theory fails and a more thorough understanding based on quantum mechanics is necessary.
Chemical reactions are transformations in the structure of molecules. Such reactions can result in molecules attaching to each other to form larger molecules, molecules breaking apart to form two or more smaller molecules, or rearrangements of atoms within molecules. Chemical reactions usually involve the making or breaking of chemical bonds.
Quantum theory describes the behavior of matter at short length scales. It is, in principle, possible to describe all chemical systems using this theory, but it is mathematically complex and profoundly non-intuitive. In practice, only the simplest chemical systems may realistically be investigated in purely quantum mechanical terms, and approximations must be made for most practical purposes (e.g. Density functional theory). Hence a detailed understanding of quantum mechanics is not necessary for most chemistry, as the important implications of the theory (principally the orbital approximation) can be understood and applied in simpler terms.
Chem4Kids.com Learn about chemistry including matter, atoms, and reactions. Includes online quizzes. http://www.chem4kids.com/
Polymers: They're Everywhere Explains what polymers are, where they're found, and why they're important. From National Geographic. http://www.nationalgeographic.com/resources/ngo/education/plastics/index.html
The pH Factor Virtual chemistry lab about the pH scale. http://www.miamisci.org/ph/
Mirror Molecules Some molecules come in mirror-image pairs: a right-handed one and a left-handed one. This Smithsonian site helps kids grades 5 and up learn more about the structure of molecules. http://americanhistory.si.edu/hosc/molecule/index.htm
Quia - Chemistry Try a user created chemistry activity or create one. http://www.quia.com/dir/chem/
Java Applets for Chemistry Java and Shockwave programs allow students to conduct virtual experiments. http://www.edinformatics.com/il/il_chem.htm
Chemistry Help Page Online quizzes, notes, and interactive links. http://www.lni.net/bchelp/frp/Chem_help_page.htm
Chemistry Functions Offers a tool to conduct molar conversions. A periodic table is also featured for reference, with atomic numbers, molar mass, and element symbol for each element. http://www.stanford.edu/~glassman/chem/index.htm
VC2: Your Virtual Chemistry Club Introduces high school students to the challenges and excitement of the molecular science. http://www.acs.org/portal/Chemistry?PID=acsdisplay.html&DOC=vc2\index.html
Chemistry Coach Tutorials Links to a number of site with tutorials, directions, or instruction about chemistry topics including balancing chemical equations, types of reactions, formulas, the mole, stoichiometry, and class information. http://www.chemistrycoach.com/tutorials-2.htm
Dan Damelin's Chemsite Part of a project to teach high school chemistry using a website as an integrated in class tool. Includes Flash animations, PDF files of labs and homework assignments, still images, and short video clips which help students to organize and visualize chemical concepts http://chemsite.lsrhs.net/index.html
The Right Chemistry Canadian site encouraging teachers and students to create chemistry-related online projects in their school. Eligible projects receive funding. Site also contains games, resources and links to chemistry projects that have already been created. http://schoolnet.ca/alasource/e/project.centre/theme/imperial/index.asp
Who Invented the Thermometer? Timeline showing the invention of the thermometer and the history of the different temperature scales. http://www.brannan.co.uk/thermometers/invention.html
Chemistry of Tie-Dying Background of the chemistry of dyes as examples of molecules, and the reaction between cotton and dye as a perfect example of a simple chemical reaction. http://www.pburch.net/dyeing/chemistry_reactivedyes_lesson.shtml
Wondernet: Your Science Place in Cyberspace Chemistry activities provided through the education division of the American Chemical Society. http://chemistry.org/portal/Chemistry?PID=wondernetdisplay.html&DOC=wondernet\index.html
BrainPOP - Matter and Molecules Animated movies, comic strips, activity pages and homework assistance. Includes several topics in chemistry, including isotopes, periodic table, and acids and bases. http://www.brainpop.com/science/matter/
Virtual Dating Java introduction to different kinds of radioactive dating, including radiocarbon and isochron dating. http://vcourseware5.calstatela.edu/VirtualDating/
Chemistry Thinkquest site offering an overview of atoms, molecules, phases of matter, acids, bases, and elements. Includes games, quizzes, bibliography, and glossary. http://library.thinkquest.org/J001539/
Learn Chemistry Tutorials, tests, problems, and tools for learning basic and organic chemistry. http://www.learnchem.net
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