[quote=@BlackPanther]
by technicality CO2 still has oxygen in it :P hence the O 

Oxygen is a chemical element with symbol O and atomic number 8. It is a member of the chalcogen group on the periodic table and is a highly reactive nonmetal and oxidizing agent that readily forms compounds with most elements...such as Carbon and hydrogen

[/quote]

I know that :P but oxygen is just not really right in this situation. then its just really still called CO2 but its difficult to explain it right because English isn't my first language but thx that you know what i mean. 

and i have asked my science teacher about it and he explains it that its really CO2 too so yeah i know that oxygen isn't wrong its just in with way you see the question in mind really XD