Chemical substance made in a laboratory. Other chemical substances commonly encountered in pure form are diamond (carbon), gold, table salt (sodium chloride) and refined sugar (sucrose). However, in practice, no substance is entirely pure, and chemical purity is specified according to the intended use of the chemical. Chemical substances exist as solids, liquids, gases, or plasma, and may change between these phases of matter with changes in temperature or pressure. Chemical substances may be combined or converted to others by means of chemical reactions. Forms of energy, such as light and heat, are not matter, and are thus not "substances" in this
Organocadmium compound to be carcinogen to humans by the IARC. Organocadmium compound An organocadmium compound is an organometallic compound containing a carbon to cadmium chemical bond. Organocadmium chemistry describes physical properties, synthesis, reactions and use of these compounds. Cadmium shares group 12 with zinc and mercury and their corresponding chemistries have much in common. Dimethylcadmium consists of linear molecules with C-Cd bond lengths of 213 pm. All organocadmium compounds are sensitive to air, light and moisture. The first organocadmium compounds, dimethylcadmium, CH-Cd-CH, and diethylcadmium, CHCH-Cd-CHCH, were prepared in 1917 by Erich Krause. In general, they are prepared by transmetalation or by an