Chemistry is a branch of physical science that studies the composition, properties and behavior of matter . Chemistry is chiefly concerned with atoms  and their interactions with other atoms - for example, the properties of the chemical bonds  formed between atoms to create chemical compounds. As well as this, interactions including atoms and other phenomena - electrons  and various forms of energy - are considered, such as photochemical reactions, oxidation-reduction reactions , changes in phases of matter, and separation of mixtures . Finally, properties of matter such as alloys or polymers  are considered.

Chemical Sciences or Chemistry is further divided into five broader categories:-

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