Chemistry Calculators


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Chemistry Calculators

Periodic Table

WebElements: the Periodic Table on the WWW -- Click on an element to get a description, background information, graphics showing element structure, atomic properties, elemental properties, compounds, nuclear properties (including NMR, isoscopes, radioisotopes), etc.
The Pictorial Periodic Table -- Click on a element in the Periodic Table to retrieve its properties or search for an element by properties. Includes charts and graphs, alternate styles for the Periodic Table, and an interactive table of isotopes.
Periodic Table of Elements -- "These pages provide comprehensive information on the periodic table of elements including over 30 properties (chemical & physical), 3,600 nuclides (isotopes), 4,400 nuclide decay modes, the elements' names in 8 languages and more."

Stoichiometry and Chemical Kinetics

Sheffield ChemPuter -- Chemputer is a set of simple interactive calculators for chemistry, including isotope patterns, element percentages, reaction yields, oxidation state, electron accountancy, VSEPR, MLXZ. It is a component of the WebElements package.
ChemicaLogic's Molecular Weight Calculator -- This java applet takes the chemical formula and returns the molecular weight.
Molar Mass Calculations and Javascript Calculator -- Calculate the molar mass of a substance from the chemical formula.
Molecular Weight/Percentage Calculator -- Enter the number of carbon, hydrogen, nitrogen and oxygen atoms and calculator the molecular weight and percentage.
Chemical Kinetics Simulation -- "The chemical kinetics simulation page is a nice demonstration of several important concepts in chemical kinetics and equilibrium."

Thermodynamics

TEST: The Expert System for Thermodynamics© -- TEST is "a general-purpose visual tool for solving thermodynamic problems and performing 'what-if' scenarios with the click of a button. The range of topics includes basic concepts, evaluation of thermodynamic states, first law of thermodynamics for closed and open systems, second law of thermodynamics, entropy and availability analysis, power and refrigeration cycles, generalized charts, gas mixtures, air conditioning, combustion, and gas dynamics."
The Thermochemical Calculator, TCC -- "TCC is a WWW tool to carry out thermochemical calculations for ideal gas mixtures"

Chemical Properties

NIST Chemistry WebBook -- "contains thermochemical data for over 5000 organic and small inorganic compounds, reaction thermochemistry data for over 8000 reactions, IR spectra for over 5000 compounds, mass spectra for over 10,000 compounds, electronic / vibrational spectra for over 3000 compounds, constants of diatomic molecules (spectroscopic data) for over 600 compounds, ion energetics data for over 14,000 compounds, and thermophysical property data for 16 fluids."
Thermophysical Properties of Fluid Systems -- Thermophysical properties (Density, Cp, Cv, enthalpy, internal energy, specific volume, entropy, speed of sound) for several fluids (e.g., water, oxygen, propane).
NIST ONLINE Reference Databases -- More databases from The National Institute of Standards and Technology, including atomic spectra, physical reference data, ceramics, CKMech, etc.
Gas Properties -- Properties (gas name, chemical formula, mole weight, critical pressure, critical temperature) for various gases (very extensive list).

Scientific Constants

NIST Fundamental Physical Constants -- Searchable database of physical constants (universal, electromagnetic, atomic and nuclear, physico-chemical).
Fundamental Physical Constants -- List of physical constants and conversion factors
Table of Fundamental Physical Constants -- "This data is derived from the 1986 CODATA recommended values of the fundamental physical constants."
The Constants and Equations Pages -- "Within this site, you will be able to look at over 550 scientific equations and constants, many with descriptions of symbols and the like." Includes a math and astronomy section.