Ammonia belongs to the class of compounds known as amines. Amines are organic compounds that contain nitrogen as the key element, with ammonia being the simplest example.
Cholesterol is a type of lipid, specifically a sterol.
Fats belong to a group of organic compounds called lipids. Lipids are a diverse group of molecules that include fats, oils, phospholipids, and steroids.
Octanal belongs to the class of organic compounds known as aldehydes, characterized by a carbon-oxygen double bond at the end of the carbon chain.
Gold belongs to the metal element class.
Cr2O3 is an oxide.
Carbohydrates
In terms of chemical class, acetone is a ketone and, more broadly, an organic chemical. In terms of hazard classification, acetone is a Class 3 Flammable Liquid
Proteins are a class of compound. They can range in size and chemical formula quite considerably, and are not a single compound which has one name.
Titanium dioxide is an inorganic compound.
Technically yes; they belong to the same chemical class known as phenethylamines.
MRC-87 is a synthetic chemical compound that belongs to the class of cannabinoids. It is a research chemical developed for scientific and experimental purposes.
Tigers belong to Class Mammalia.
Opossums belong to the class mammalia.
A piranha belong to the Phylum Chordata, and the class Osteichthyes.
Sea fans belong to the class Anthozoa
Echidnas belong to the Class Mammalia and Order Monotremata.