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.
Hydroxides of metals form a class of compounds known as metal hydroxides. These compounds consist of a metal ion bonded to a hydroxide ion (OH-), resulting in a basic chemical species. Metal hydroxides are often characterized by their ability to dissociate in water to form metal cations and hydroxide ions.
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.