Astronomy

Stephen Hawking's Universe
http://www.wnet.org/hawking/html/home.html
Includes information on the television programs, and a teacher's guide which can be downloaded.

Comet Hale-Bopp
http://encke.jpl.nasa.gov/

Mars Global Surveyor
http://mars.jpl.nasa.gov/

Nine Planets
http://www.seds.org/billa/tnp/

NASA
http://www.nasa.gov/

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Biology

Tree of Life
http://ag.arizona.edu/tree/phylogeny.html
Contains information about the phlogenetic relationship of characteristics or organisms.

Cancer Net
http://www.nci.nih.gov
Maintained by the National Cancer Institute, this site contains a large collection of documents and research information related to cancer and carcinogens.

OncoLink
http://www.oncolink.upenn.edu/
An excellent source for information on cancer sponsored by the University of Pennsylvania's Cancer Center.

Mayo Clinic
http://www.mayohealth.org/
Reliable medical information from the Mayo Clinic's searchable database

Medicinenet
http://www.medicinenet.com
Excellent site for general information. It includes a medical dictionary, information on diseases and treatment, Ask the MD expert and the latest medical news. The site bills itself as the state of the art medical information.

National Library of Medicine
http://www.nlm.nih.gov
Extensive online information dealing with clinical care, toxicology, environmental health and basic biomedical research.

Healthfinder
http://www.healthfinder.com
Provides a gateway to more than 550 Web sites, including 200 federal and 350 state, local or university sites; the information is organized by subject for ease of searching.

Food and Drug Administration
http://www.fda.gov

National Institute of Health
http://www.nih.gov

Virtual Frog Dissection
http://www-itg.lbl.gov/ITG.hm.pg.docs/dissect/info.html

Pharmaceutical Information
http://pharminfo.com

MayoClinic
http://www.mayohealth.org/

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Chemistry

Atoms

Atoms and Molecules
http://www.chem.ualberta.ca/courses/plambeck/p101.new/p01022.htm
This site contains the atomic theory of matter, law of conservation of mass, law of constant composition, law of multiple proportions, and presents the atomic theory as stated by Dalton; from Introductory College Outline by James A. Plambeck, University of Alberta.

Mendeleev's Statement of the Law of Periodicity
http://pooh.chem.wm.edu/chemWWW/courses/chem105/periodlaw.html
Contains a link to modern statement of the Law of Periodicity

Atomic Structure and Periodicity
http://www.yk.psu.edu/~jhb3/cotw07.htm
Contains the atomic spectra, Bohr model, quantum mechanical model, energies or orbitals, electron configurations, valence electrons, periodic table, periodic trends from CHEM 12, PSU York Campus.

Structure of the atom
http://www.nyu.edu/pages/mathmol/textbook/atom.html

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Biographies

Nobel Prize Winners in Chemistry
http://www.almaz.com/nobel/chemistry/
Biographies which can be searched by   year or alphabetically

Chemists
http://www.woodrow.org/teachers/ci/1992/
Biographies organized by the discovery

National Invention Hall of Fame Index
http://www.invent.org/book/book-index.html
Organized alphabetically by the invention. Provides biography of the inventor and information on the invention

Scientists from the 16th and 17th centuries
http://es.rice.edu/ES/humsoc/Galileo/Catalog/catalog.html
A site detailed by biographies

Biographies of Chemists
http://www.liv.ac.uk/Chemistry/Links/refbiog.html
Arranged alphabetically; includes links to other biographical sites

Radioactivity: Historical Figures
http://www.gene.com/ae/AE/AEC/CC/historical_background.html

Biographical Dictionary
http://www.asap.unimelb.edu.au/hstm/hstm_bio.htm
From the Virtual Library of Science, Technology and Medicine - excellent source of links to biographies of scientists from the past.

Biographies of Women Physicists
http://www.physics.ucla.edu/cgi-bin/cwp/gucc.pl?field=Phase2

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Careers in Chemistry

Chemical Careers
http://www.bsu.edu/csh/chemistry/careers.html
Provides information compiled by the Chemistry Department at Ball State University

Careers in Biotechnology
http://www.gene.com/ae/AB/CC/bio_intro.html
Sponsored by Access Excellence - scroll down to job descriptions to learn more about careers in the biotechnology field.

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Electronic Configuration

Wave - Particle Nature of Light
http://www.qmw.ac.uk/~zgap118/index.html
Series of pages on the nature of particles and waves and their similarities and differences

Matter and Energy: Spectroscopy
http://www.chem.ualberta.ca/courses/plambeck/p101.new/p0121x.htm
Contains links to discussins on the nature of light, the continuous spectrum, Plank and Photons, line spectra; lecture notes of Dr. James A Plambeck, Universiity of Alberta.

Planck's Quantum Theory
http://edie.cprost.sfu.ca/~rhlogan/plank.html

Line Spectra
http://www.chem.uidaho.edu/~honors/spectra.html

Electron Orbitals
http://zebu.uoregon.edu/~soper/Light/atomspectra.html

Nuclear Atomic Model
http://edie.cprost.sfu.ca/~rhlogan/rutherf.html

Bohr Model of the Atom - Absorption of Light
http://www.chem.uidaho.edu/~honors/bohratom.jpg

Quantum Mechanical Model of an Atom
http://edie.cprost.sfu.ca/~rhlogan/summary.html

Quantum Number Assignment Summary Sheet
http://edie.cprost.sfu.ca/~rhlogan/summary.html

Hydrogen Orbitals
http://mol.chem.dal.ca/horbital/orbital.html

Shapes of Atomic Orbitals
http://tqd.advanced.org/3659/structures/shapes.html

Grand Orbital Table
http://www.albany.net/~cprimus/self/orbtable.htm

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Formulas

The Mole and Chemical Formulas
http://www.chem.vt.edu/RVGS/ACT/notes/The_Mole.html
A review of mole with sample empirical and molecular formula problems; Gwen Sibert, Roanoke Valley Governor's School in Virginia

Guide Sheet for Mole Problems
http://www.chem.vt.edu/RVGS/ACT/notes/Study_Guide-Moles_Problems.html
Provides instructions for solving various types of problems including mole mass, percentage composition, empirical formula, molecular formula; from Gwen Sibert, Roanoke Valley Governor's School.

Mole Problem Set
http://science.widener.edu/svb/pset/moles.html
Developed by S. E. Van Bramer for Chemistry 145 at Widener University.

Molecular Weight and Percentage Calculator
http://yip5.chem.wfu.edu/yip/js/jsdemo1.html
Experimental calculator for determining the molecular weight and the percentage composition; need browser that supports JavaScript

Formula Mass Calculator
http://www.carlton.paschools.pa.sk.ca/cgi-win/mmcalc.exe
Experiment calculator of David Dice; type in formula and it calculates molar mass.

Types of Chemical Formulas
http://edie.cprost.sfu.ca/~rhlogan/formulas.html
A discussion of empirical, molecular and structural formulas from Ralph Logan, Dalla County Community College District, North Lake College

Naming Chemical Compounds
http://science.widener.edu/svb/pset/nomen_b.html
Allows you to use the chart as a flow chart to help you break down the different systems of naming to determine the name of a compound

Naming Chemical Compounds
http://edie.cprost.sfu.ca/~rhlogan/formulas.html

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Gases

Gases
http://www.yk.psu.edu/~jhb3/cotw05.htm
Gas laws, gas stoichiometry, gas density, Dalton's Law of Partial Pressures, KMT of gases, Graham's Law of Effusion

Gas Law Problem Set
http://science.widener.edu/svb/pset/gaslaw.html
Developed by S. E. Van Bramer for Chemistry I at Weidener University

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History of Chemistry

The Alchemy Web Site
http://www.levity.com/alchemy/home.html
General reference material on alchemy

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Links to Information

Chemistry Lecture Notes
http://www.chem.ualberta.ca/courses/plambeck/p101.new/jp101.htm
Dr. James A. Plambeck from the University of Alberta, Canada.

Virtual Chemistry Club
http://www.chemcenter.org/vc2/index.html
Sponsored by the ChemCenter of the American Chemical Society; a virtual treasure of information including careers, atoms, ask a chemist, science fair information, build a molecule links etc.

MathMole Home Page
http://www.nyu.edu/pages/mathmol/
An introductory starting point for those interested in the field of molecular modeling

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Measurement

Chemical Foundation
http://www.yk.psu.edu/~jhb3/cotw01.htm
An introduction to measurement and scientific method; explains some of the tools that chemists use

Fundamental Units of Measurement
http://www.gene.com/ae/AB/CC/bio_intro.html
The international system of units

Metric System and Unit Conversion
http://edie.cprost.sfu.ca/~rhlogan/metric.html
Contains a table of prefixes, measurement (mass, dimensional, volume, area), practical problems with answers. Authored by Ralph Logan.

Density Calculations
http://www.woodrow.org/teachers/chemistry/links/chem1/Chapter2.html
How to calculate density with formula D=M/V; includes a set of practice problems (no answers) sponsored by the ChemTeam, Diamond Bar High School

Density
http://www.nyu.edu/pages/mathmol/textbook/density.html
A chapter from the MathMol Hypermedia textbook; very basic introduction with graphic and practice problems from New York University Scientific Visualization Center

Conversion of Units
http://www.chemie.fu-berlin.de/chemistry/general/units_en.html

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Periodic Table

Periodic Table
http://chemlab.pc.maricopa.edu/periodic/periodic.html
The most definitive site on the web for periodic tables

The Periodic Table on the WWW
http://www.shef.ac.uk/~chem/web-elements/web-elements-home.html
WebElements by Mark Winter of the University of Sheffield, England

Periodic TablETRIS
http://yip5.chem.wfu.edu/yip/swlib/ptable.html
A game to improve your memory of the elements position on the periodic table.

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Solids and Liquids

Liquids and Solids
http://www.yk.psu.edu/~jhb3/cotw10.htm
A detailed discussion of forces, crystal structure, phase and energy changed; includes equations and diagrams; lecture notes of Dr. James H. Burness, Chem 12, Penn State, York Campus

General Characteristics of Solids and Liquids
http://virtual.yosemite.cc.ca.us/lmaki/Chem142/chap_outlines/chapter10.htm

Properties of Liquids
http://tqd.advanced.org/3310/lographics/textbook/u01s04.html

Selected Physical Properties of Some Solid Materials
http://www.york.ac.uk/depts/chem/course/studhand/solids.html

Minerals, Crystals and Their Systems
http://www.ganoksin.com/borisat/nenam/mineral.htm

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Endangered Species

E-E Link
http://eelink.net/EndSpp/Endangered.html
Fact sheets on endangered species; animals can be located by region or name.

Endangered Species
http://www.nwf.org/nwf/endangered/listing/index.html
List of animals and plants that are considered threatened or endangered.

Endangered Species Fact Sheets
http://eelink.net/EndSpp/
Formatted by the Fish and Wildlife Service, Sea World/Busch Gardens, World Wildlife Fund and EE-Link.

Electronic Zoo
http://netvet.wustl.edu/ssi.htm
An excellent site for pictures, sounds and information on all animals including domestic and wildlife and those in captivity.

Photos of Endangered Species
http://www.defenders.org/eslc.html
When you click on the picture, you will get a fact sheet of information on the species and a link to pictures.

American Natural History Museum
http://www.amnh.org/Exhibition/Expedition/Endangered/index.html
Take a virtual tour of the exhibit on endangered species.

Threatened Animals of the World
http://www.wcmc.org.uk/data/database/rl_anml_combo.html
The WCMC Animals Database holds information on threatened species; use a check off to find endangered species by type and location.

Endangered Species Update
http://www.umich.edu/~esupdate/
This Internet magazine contains articles on the science and politics of conservation and biology.

Envirolink Search Resources
http://www.envirolink.org/search
Type in the words, endangered species, and you will a list of articles on that topic.

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Environmental Science

Superfund Sites
http://www.epa.gov/superfund/
Clickable map to superfund sites throughout the United States.

Environmental Database for Schools
http://www.soton.ac.uk/~engenvir/