PLEASE ONLY ANSWER IF YOU ARE 100% POSITIVE THIS IS 50 PERCENT OF MY GRADE! HURRY I'M BEGGING U! WILL GIVE BRAINIEST AND 100 PTS!

A chemical reaction starts when an unknown chemical with a very low ignition point is mixed with another in a chemistry lab. To stop the fire, the teacher removes the unknown chemical that has not burned. Even if the reactants and products of this reaction are unknown, it doesn't matter. Why would the teacher do what he did?