What observable evidence indicates that a double-displacement reaction has occurred? What evidence indicates that a combustion reaction has occurred ?

Ok so co(g) is not pronoused that. the only clue is that youpronouse it the oppisote way. 

Answer    "a salt" would be the best answerexplanationsalts can be defined as ionic compounds that are neither acids nor bases. nacl is an example of a salt, and its ionic.an enzyme is an organic compound which is covalently bonded, not ionically bonded.acids are generally held together by covalent bondsan element does not need any bonds to exist

Elements that have complete valence shells are found in group 18, also known as the noble gases. these gases possess the stable octet, and are neon, radon, xenon, etc.

Idk. but i think it is. u, oh yea idfk