Chem Lab's topic generally changes every year. I think atomic theory/bonding/states hasn't been in for a while (like 5 years) so maybe that, but I'm not positive. But Physics Lab used to change every year, and now it's been energy for like 3 years in a row, so anything could happen.
Events: Ecology, Herpetology, Cell Bio, Entomology, Sounds of Music, Circuit Lab, Chem Lab, Disease Detective, Dynamic Planet, Five Star, EggONaut, Enviro Chemistry, Fermi, Quantum Quandaries!
Nationals: Wichita: Ecology-4, Entomology-5, Team-11; DC: Sounds-1, Team-11