CO2: Carbon Dioxide
Carbon forms two double bonds with two oxygen atoms to make linear CO2; it is exhaled in respiration, absorbed in photosynthesis, sublimes as dry ice, and traps heat as a greenhouse gas at a real, rising atmospheric concentration.
Two double bonds, one carbon locked between What draws a straight line through three atoms Linear geometry, sp hybridized, no bend at all What do your lungs push out with every breath Carbon dioxide, built from those double bonds What do the leaves pull in through open pores The same three atoms, CO2 again What turns to solid without leaving a puddle Dry ice sublimes, straight from solid to gas What traps the heat the sun sends bouncing back CO2, a greenhouse gas by nature What count now passes four hundred twenty parts per million CO2, rising in the air we measure What burns from every engine, every flame Carbon plus oxygen, twice, released as CO2 What links your breath to a forest breathing in One molecule, traded back and forth, the cycle unbroken CO2, linear, invisible, everywhere
Key Concepts: Carbon forms two double bonds with two oxygens, giving CO2 a linear, sp-hybridized geometry | Produced by respiration and combustion, absorbed by photosynthesis | Dry ice sublimes directly from solid to gas | CO2 is a greenhouse gas; atmospheric concentration has passed 420 parts per million | Companion to "Carbo Meets Two Oxyas"
Key Words: double bond, linear, sp hybridized, sublimation, greenhouse gas, parts per million, CO2