It contains atoms of different elements chemically combined together in a fixed ratio.

They are pure substances. They are made from the same types of molecules.

They are made of two or more substances that are mixed physically but not chemically; they do not contain any atomic bonds.

They contain different elements in a fixed ratio arranged in a defined manner through chemical bonds. They contain only one type of molecule. Elements that compose the compound are chemically combined.

The ingredients are physically mixed but chemically separate. Often they are visibly distinct.

It can be separated into simpler substances by physical or mechanical methods.

It can be separated into simpler substances by chemical methods/reactions.

It is represented using its chemical formula that represents the symbols of its constituent elements and the number of atoms of each element in one molecule of the compound.

They do not have specific, consistent chemical and physical properties of their own. They reflect the properties of their constituent substances, which retain their original properties. e.g. chocolate milk retains properties of chocolate and milk