In chemistry, inorganic compounds are the chemical substances that do not contain carbon–hydrogen bonds, i.e., one that is not an organic compound. The difference, however, is not well defined, and authorities have different opinions on the matter. Inorganic chemistry is a branch of chemistry that studies inorganic substances.
The Earth’s crust is mostly made up of inorganic materials, however the contents of the deep mantle are still being studied.
Simple carbon compounds are frequently called to as inorganic. Carbon monoxide, carbon dioxide, carbides, and the compounds of inorganic cations carbonates, cyanides, cyanates, and thiocyanates are only a few examples. Many of these are common components of predominantly organic systems, such as organisms; simply because a chemical is inorganic does not mean it does not exist in living things.
The conversion of ammonium cyanate to urea by Friedrich Wohler in 1828 is typically credited as the beginning of modern organic chemistry. There was a prevalent idea in Wohler’s time that organic substances possessed a dynamic soul. The distinction between inorganic and organic chemistry is essentially conceptual in the absence of vitalism.