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ChemBuddy - chemical calculators
www.chembuddy.com
Easy to use programs for pH calculation, concentration conversion, solution preparation, equation balancing and stoichiometry with built in dissociation constants and density tables databases. Free extensive lectures on pH calculation and concentrations.
Elements database - Periodic Table
www.elementsdatabase.com
Free searchable Periodic Table database with a description of all the elements.
insecticide
www.source-chem.com
Offers quality Insecticides, Fungicides, Herbicides, Rodenticides, Plant Growth Regulator for insecticide buyer, Fungicide importer, Herbicide purchaser.