'''Ìpògùn''' ({{lang-en|Chemistry}}:''Chemistry''), ẹ̀ka [[physical science|sáyẹ́nsì oníṣeẹ̀dá]], jẹ́ ẹ̀kọ́ìwádìí ìkósínú, ìní àti ìwùwà ohun èlò.<ref name=definition>{{cite web|url=http://chemweb.ucc.ie/what_is_chemistry.htm |title=What is Chemistry? |publisher=Chemweb.ucc.ie |date= |accessdate=2011-06-12}}</ref><ref>[http://dictionary.reference.com/browse/Chemistry Chemistry]. (n.d.). Merriam-Webster's Medical Dictionary. Retrieved August 19, 2007.</ref> Ìpògùn Chemistry is concerned with atoms and their interactions with other atoms, and particularly with the properties of [[chemical bond]]s. Chemistry is also concerned with the interactions between atoms (or groups of atoms) and various forms of energy (e.g. photochemical reactions, changes in phases of matter, separation of mixtures, properties of polymers, etc.).
