UIC COLLEGE PREP CHEMICAL REACTION HOSPITALIZES 2 STUDENTS Tags: us_IL, laboratory, explosion, injury, unknown_chemical  CHICAGO (WLS) -- Two students were injured after a small chemical reaction  during lab at UIC College Prep, Chicago police said.  The students were taken to Stroger Hospital with burns to their faces. They are  expected to be fine, according to police. A third student had a minor eye  irritation, officials said.   The students were mixing chemicals in the chemistry lab to create a green flame  when something went wrong and there was an explosion, police said. The same  experiment has been done many times in the past without incident, according to  the deputy chief of police.   The Chicago Health Department checked the classroom and determined it was safe,  but the lab is closed for cleanup.  ---------------------------------------------