1- Dynamic Periodic Table:
Know any information about periodic table elements such as valence, state, color, atomic radius, electronic configuration.........and many other
Go to: http://www.ptable.com
2-ChemSketch: Easy draw the chemical structure
ACD/ChemSketch Freeware is a drawing package that allows you to draw chemical structures including organics, organometallics, polymers, and Markush structures. It also includes features such as calculation of molecular properties (e.g., molecular weight, density, molar refractivity etc.), 2D and 3D structure cleaning and viewing, functionality for naming structures (fewer than 50 atoms and 3 rings), and prediction of logP. The freeware version of ChemSketch does not include all of the functionality of the commercial version
3- NMR predictor:
Draw the chemical structure of the organic compound then you obtain the NMR spectrum of this compound
4- Chemistry calculator
Calculate Molarity of liquid and solid, Gas laws, pH, acid value of oil ...........and many other
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