Names: Carbon dioxide, {{plainlist|, CO2Carbonic acid gas, Dry ice, [CO2], Carbonic anhydride, R-744, E-290, E 290, E290, Carbonic acid anhydride, Carbon-12 dioxide, Methanedione, Carbon oxide, CO₂, [Note: Normal constituent of air (about 300 ppm)].
Appearance: Colorless gas ; Odourless colourless compressed liquefied gas ; Colorless, odorless gas. [Note: Shipped as a liquefied compressed gas. Solid form is utilized as dry ice.]
Cu
Names: Copper, Copper (dusts and mists, as Cu), CuCU-7, Tatum-T, Paragard T 380A, Element 29, Cuprum, Copper metal dusts, Copper metal fumes
Appearance: Solid in various forms. turns green on exposure to moist air ; Reddish, lustrous, malleable, odorless solid.