chemical science,
chemistry the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions
natural philosophy,
physics the science of matter and energy and their interactions; "his favorite subject was physics"
activated,
excited (military) set up and placed on active assignment; "a newly activated unit"
labile liable to change; "an emotionally labile person"
oxidizable capable of undergoing a chemical reaction with oxygen
thermolabile (chemistry, physics, biology) readily changed or destroyed by heat
reactive -
reacting to a stimulus; "the skin of old persons is less reactive than that of younger persons"