1) Carbon attachment 2) Compound like silica 3) Dry ice 4) Oxide 5) Silica or dry ice 1) Co2 
• (n.) An oxide containing two atoms of oxygen in each molecule; binoxide. • (n.) An oxide containing but one atom or equivalent of oxygen to two of a metal; a suboxide.
(di-ok´sīd) an oxide with two oxygen atoms, such as carbon dioxide (CO2).
Di·ox'ide noun [ Prefix di- + oxide .] (Chemistry) (a) An oxide containing two atoms of oxygen in each molecule; binoxide. (b) An oxide containing but one atom or equivalent of oxygen to two of a metal; a suboxide. [ Obsolete] Carbon dioxide . See 
Type: Term Pronunciation: dī-oks′īd Definitions: 1. A molecule containing two atoms of oxygen, carbon dioxide, CO2.
[n] - an oxide containing two atoms of oxygen in the molecule
noun an oxide containing two atoms of oxygen in the molecule
an oxide containing two atoms of oxygen, each of which is bonded directly to an atom of a second element, as manganese dioxide, MnO, or nitrogen dioxide, NO.