Annotated Web Links


3D Molecules

3-D Molecules
by Jonathon Goodman, Cambridge University (UK)
Site displays stick structures that can be moved and rotated of about 50 common molecules.

Alphabetical Listing of Molecules
Link provides an alphabetical listing of molecules that can be viewed for structure characteristics.

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Buffers for pH Control
by Rob Beynon, University of Manchester Institute of Science and Technology
Provides recipes for making buffers of desired pH provided ionic strength and temperature of reagents is given.

pH meter and pH measurements
Marcin Borkowski
All you want to know about pH meters, pH measurements and pH electrodes. Introduction to history, theory and good practice, reliable measurements and electrode maintenance. Links to models and manufacturers.

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% Yield
by Mark Winter, University of Sheffield
Site gives percent yield of a product if quantities of reactant and product are known.

Calculator Fundamentals
by Shodor Education Foundation, UNC Chapel Hill
This is an excellent resource to use as an introduction or review of the fundamentals of chemistry and could serve as supplemental course material.

Chemical Calculations
by Jonathon Goodman, Cambridge University (UK)
Site provides molecular weight, mass percent composition, and molecular isotope patterns for given molecules.

Conversion Factors for Energy Equivalents
by National Institute of Standards and Technology, US Gov.
Site provides conversion equations and correlation coefficients for pairs of constants.

Formula Weight and Mass %
Site contains calculators for isotope patterns, elemental percentages, and % yield.

Lechatelier’s Principal
by David Dice, Carlton Comp. HS (Canada)
Site gives instructions and explanations as students observe changes in the position of the chromate/dichromate equilibrium. It also provides photos of the results so that the activity can be done outside the laboratory.

Special Processes of an Ideal Gas
by Walter Fendt, Paul Klee Gynasium Gersthofen
Site provides a great visual representation of the gas laws. Students can manipulate the pressure, volume, and temperature of an ideal gas and the resulting relationship is plotted on a chart within the site.

Tutorial-Molecular Mass
by David Dice, Carlton Comp. HS (Canada)
Site provides a thorough tutorial on concepts and history of atomic, molecular, and molar masses; includes a quiz.

Unit Conversion – Online Calculator
Online conversions between different metrics of length, weight, temperature, pressure, energy, frequency and more.

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Chem Finder
Provided by CambridgeSoft

ChemID Plus
Provided by National Library of Medicine
Database of over 380,000 chemicals, synonyms, structures, regulatory list information, and links to other databases

DTP / 2D and 3D Structural Information
Provided by the National Cancer Institute
The NCI has collected information on almost half a million structures in the past forty years. The collections of structural information are freely available.

EAFUS: A Food Additive Database
Provided by US Food and Drug Administration
Contains administrative, chemical and toxicological information on over 2000 substances directly added to food.

ECOTOX Database
Provided by US EPA
ECOTOX (ECOTOXicology) database provides single chemical toxicity information for aquatic and terrestrial life.

NIST Scientific and Technical Databases
Provided by National Institute of Standards and Technology
Access page to a variety of scientific and technical databases

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Gas Laws

Behavior of Gases
by David Dice, Calton Comp. HS
Site displays the gas laws through the motion of particles with selective parameters such as probability of effective collision, temperature, and number of particles.

Gas Laws
George McBane, D. Neal McDonald, Zil Lilas, Midori Kitogawa-DeLeon, and Sherwin J. Singer, Ohio Stat
Site gives great visual and verbal descriptions explaining the gas laws.

Scuba Physics: Buoyancy and Gas Laws
This site provides definitions and simple explanations of Charles’ Law, Boyle’s Law, and Archimedes Principle.

Virtual Laboratory: Ideal Gas
University of Oregon
Link provides a virtual laboratory which shows effects of variables like temperature, pressure, and volume on gases.

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General Chemistry

Analytical Chemistry Forum
Analytical Chemistry Forum for chemists and students alike

Chem Index
by Mark Winter, University of Sheffield
Site provides an index for chemistry links from all over the world and lists sites by discipline, organization, etc.

Chem Web

Site provides links to journals, free abstracts, jobs and internships, and chemistry tools including NMR prediction and IUPAC naming. Free registration.

Introductory and General Chemistry
Richard Pendarvis
Introductory and General Chemistry Links by Topic

NIST Chemistry Handbook
by National Institute of Standards and Technology, US. Gov.
Site provides a searchable database of general chemistry information including formula, name, CAS registry number, author, and structure. It also provides physical properties of materials. (This might be particularly helpful to organic chemistry students.)

Preparation for Topics in College Chemistry
Site provides a good review of general chemistry topics and also gives mini lectures to help understand difficult topics. Use this as a review to help prepare for a chemistry test.

Dr. Yue-Ling Wong
Site provides a titration simulator with different concentrations of acids and bases.

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Instructor Resources

Instructional Resources for Chemistry
by Steven Lower, Simon Frasier University
Site provides links to chemistry education sites.

The IrYdium Project
by Carnegie Mellon University
Site provides a variety of applets and concept tests which contain conceptual questions dealing with equilibrium, thermodynamics, and kinetics.

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Lewis Structures

Counting Electrons
by Mark Winter, University of Sheffield
Site provides explanations of predicted molecular geometry using VSPRE Theory. Site has links to a tutorial and practice exercises.

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Light and Matter

Atomic Spectra
University of Oregon
Site provides emission and absorption spectra of elements.

Black Body Radiation
Baush   Lomb
Site provides explanation of black body radiation.

Light and Matter
by Dr. Yost and Dr. Daint, Univeristy of Tennessee
Site provides explanations and visual representations of Steffan-Boltzman Law, the Bohr model, quantized energy, Planck’s law, continuum, emission, and absorption spectra, and Zeeman spectral splitting.

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Atomic and Molecular Orbital Applet
Craig Counterman, Mass. Institute of Tech.
Site contains an applet that displays selected atomic and molecular orbitals, calculated from the wave function.

Chemistry Guide
Chemistry Guide – comprehensive listing of quality chemistry sites on the Internet.

Chemistry Link
WWW Chemistry Guide – comprehensive and evaluated guide to web sites related to chemistry and the chemical industry. Its mission consists
in collecting and independently annotating all useful chemistry sites.

Electrons in Atoms: F Orbitals
Fred Senese
Site provides excellent pictures of f-oritals and provides a good explanation of orbital structure. Site also provides links to other useful atomic orbital sources.

Hazards Assessment
Links provides a site for a NASA test facility which performs impact studies on explosions of liquid hydrogen and oxygen.

Site provides a great interactive explanation of atomic orbital hybridization.

National Mole Day
National Mole Day Foundation, Inc.
National Mole Day Foundation, Inc. site

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Periodic Tables

Chemicool Periodic Table
Table provides each element’s physical properties and ionization energies.

Data on Elements
by Jonathon Goodman, Cambridge University
Site provides useful, but limited data on the elements of the periodic table.

Electron Configurations
by Carnegie Mellon University
Site provides limited data on the elements, but also provides well-done electronic configurations of the elements.

Interactive Periodic Table of Elements
by Yinon Benton
The periodic table in this site gives electron location, isotopes, history, and physical properties of each element. The page is also equipped with related links.

Net Elements
by John Ensley, University of Cambridge
Site provides physical, geological, biological, and discovery data for each element of the periodic table.

Periodic Table
Periodic table displays discoverer, atom weights, electron shells, and valence patterns of each element.

Periodic Table of Elements and Data
Site provides a useful periodic table. Also by clicking on an element, informations about the element will appear. This includes atomic mass, melting point, boiling point and even a history of the element.

Alexander Design
Site provides a number of periodic tables.

Visual Elements Periodic Table
Royal Society of Chemistry
Flash enabled Chemical Society periodic table of elements.

Web Elements Interactive Periodic Table
by Mark Winter, University of Sheffield
Site provides pages about isotope patterns, element percentages, yield, oxidation states, electron states, electron counts, VSPRE, and MLXZ for compounds.

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Boltzman Kinetic Energy Distribution
by David Dice, Carlton Comp. HS (Canada)

by National Institute of Standards and Technology

Java Application
by Walter Fendt, Paul Klee Gynasium Gersthofen

Significant Digits
by David Dice, Carlton Comp. HS (Canada)

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SI Naming System

SI Naming Tutorial
by National Institute of Standards and Technology, US Gov.
Site gives rules, definitions, and the history of the units in the SI naming system.

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A Tutorial on Balancing Equations
George McBane, D. Neal McDonald, Zil Lilas, Midori Kitogawa-DeLeon, and Sherwin J. Singer, Ohio Stat
Site contains a tutorial for balancing equations and provides a creative “Monkey Business” exercise as a practice problem.

Chemical Reaction Stoichiometry
by Smith, Sikenata, and Missen, University of Guelph
Site provides tutorial and Java applications for solving stoichiometry problems using the matrix reduction method. Requires Adobe Acrobat.

Limiting Reagents
by Carnegie Mellon University
Site provides a good visual representation of limiting reagents using the example of ammonia and carbon dioxide.

Stoichiometry Equilibrium
by Carnegie Mellon University
Site gives molar and mass quantities of reactants and products of iodine, hydrogen, and hydrogen iodide at various points of the reaction.

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Structure of Atoms

Atomic Orbitals
Site gives a brief description of atomic orbitals and contains an Orbital Viewer for drawing orbitals.

Bohr Model
by Walter Fendt, Paul Klee Gynasium Gersthofen
Site provides particle and wave visualization of the Bohr Model of hydrogen.

Hydrogen-like Orbitals
Univeristy of Kentucky
Site provides animated orbitals that are the angular part of the wave functions for discrete stationary states of a one-electron atom.

Isotope Patterns
by Mark Winter, University of Sheffield
Site displays a bar graph of formula weights resulting from isotopes in formula.

by Mark Winter, University of Sheffield
Site gives metal, ligand, atom, and anion designations for compounds.

Oxidation States of Ions
by Mark Winter, University of Sheffield
Site provides oxidation states of components of complex ions

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The Oxygen Bomb Calorimeter
Gary L. Bertrand
Site provides an animation of a bomb calorimeter.

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Organic Chemistry Tutorials
maintained by Steven A. Hardinger, Department of Chemistry & Biochemistry, UCLA

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VSEPR Theory

Molecular Structure Calculations
Paul J. Schupf
Provides calculations for bond lengths, atomic charges and dipole moments. Also illustrates the best Lewis structure possible in 3-D. There is a calculator at the end used to create your own molecule that is not listed on the page.

Valence Shell Electron Pair Repulsion Theory
by Mark Winter, University of Sheffield
Site provides explanations of predicted molecular geometry using VSEPR Theory. (Includes practice exercises.)

VSEPR Help Page
Purdue University
Site provides the rules of VSEPR Theory and a tutorial for using VSEPR Theory. It also provides practice problems.

VSEPR Tutorial
by John Nash, Purdue University
Site provides useful, but limited tutorial on VSPRE Theory. Tutorial, glossary, and practice problems are also available.

VSEPR Tutorial II
by Mark Winter, University of Sheffield
Site provides an extensive tutorial with nicely represented 3-D shapes