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Arrhenius Calculation
From Jeffrey Clymer, Java applet that calculates activation energy and entropy from rate constants at several temperatures.

Basic Reaction Kinetics
Online tutorial covering rate law, zero-, first- and second-order reactions, equilibrium kinetics, and temperature dependence of rate constant.

ChemFinder WebServer
A chemical database that can be searched by compound name, formula, CAS RN, etc. Provides some physical property data and links to lots of information on the respective compound.

Chemical Reaction Stoichiometry
Tutorial from W. R. Smith et al. about the solution of the system of linear atomic species conservation equations. Text is in PDF format. Includes also an interactive Java applet for implementation of the matrix reduction method.

Chemicool Periodic Table
Gives all the things you'd expect from a periodic table, plus some more: atomic number and weight, density, transition states, physical properties, standard reactions, radius, relative abundance, and estimated cost.

Chemistry Tutor
Excellent interactive, online tutorial for introductory chemistry. It is also possible to submit and/or answer questions.

Computational Chemistry Impact
Article from Chemical & Engineering News on new developments in computational chemistry and information management software.

Dilution Calculations
From Christopher M. A. Haslego, how to handle mass and volume percentages for preparing diluted solutions.

Electronic Statistics Textbook
An awesome online textbook about statistics. From Statsoft. The complete textbook can also be downloaded.

Fundamentals of Microbiology
A virtual microbiology course: biochemistry, cells, bacteria, viruses, genetic engineering, water, food, and industrial microbiology.

Hypertext Periodic Table
Periodic table of the elements that gives information about atomic radius, atomic number, atomic mass, boiling and melting point, and density, among others.

The Integrator
Online tool to solve integrals in symbolic form.

Introduction to Basic Organic Nomenclature
If you have difficulties with the names of organic compounds you should have a look at this excellent tutorial.

The Laws List
Henry's and Raoult's law aren't listed but most others. A glossary of laws, rules, and concepts of physics, compiled Erik Max Francis.

Mass Calculator
Java applet for calculating the molecular weight of a substance from the chemical formula. Additionally, the mass fraction of an element can be calculated.

Molecular Weight Calculator Applet
Enter the chemical formula of a substance and get its molecular weight (Java capable browser required).

NIST Chemistry WebBook
NIST Standard Reference Database Number 69 - March 1998 Release. Database of thermochemical, thermophysical, and ion energetics data. Searchable by name, formula, CAS registry number, molecular weight...

Organic Chemistry OnLine
Online book on Organic Chemistry: structure & bonding, nomenclature, reactions, spectroscopy. Includes problem sets and multiple choice quizzes with solutions. The link on the heading of main section I is broken, though.

Scalar and Vector Quantities
From Dr Clive Buckley, North East Wales Institute of Higher Education, basic introduction to scalar and vector quantities with examples from mechanics.

Science and Technology Metrics
Monograph by Dr. Ronald L. Kostoff from the US Defense Technical Information Center about quantitative approaches to research assessment. Accompanied by a bibliography with more than 5,600 references.

Table of the Nuclides
A clickable chart of all known nuclides with atomic and stability data. There is also a search function for a given name.

Ullmann's Encyclopedia of Industrial Chemistry
A thorough overview of this standard reference work for industrial chemistry and chemical engineering from Wiley-VCH. There's also information about the new CD-ROM version of the 5th edition.

Virtual Laboratories in Probability and Statistics
From Kyle Siegrist, University of Alabama in Huntsville, interactive, web-based modules about special models, basic probability, and basic statistics.

WebElements
A clickable periodic table with a lot of information about each element.