Formula unit Formula unit A formula unit in chemistry is the empirical formula of any ionic or covalent network solid compound used as an independent entity for stoichiometric calculations. It is the lowest whole number ratio of ions represented in an ionic compound. Examples include ionic NaCl and KO and covalent networks such as SiO and C (as diamond or graphite). Ionic compounds do not exist as individual molecules; a formula unit thus indicates the lowest reduced ratio of ions in the compound. A "chemical formula" shows the kinds and numbers of atoms in the smallest representative unit of a substance. In
Chemical garden obtained Common salts used in a chemical garden include: While at first the chemical garden may appear to be primarily a toy, some serious work has been done on the subject. For instance this chemistry is related to the setting of Portland cement, hydrothermal vents and during the corrosion of steel surfaces tubes can be formed. A chemical garden helps one to understand the nature of that chemical substance. The nature of the growth also is useful in understanding classes of related behavior seen in fluids separated by membranes. In various ways it resembles the growth of spikes or blobs