Answer;
-Over a blue flame
Explanation;
-The Bunsen burner is the most common source of heat in the chemistry laboratory. Natural gas enters the burner near at the base, rises through a barrel, mixes with air, and burns. By proper adjustments the most efficient flame can be obtained.
-When heating a substance over a Bunsen burner the object should be placed over a blue flame for the most efficient heating, because it is the hottest.
Answer: for the most efficient heating the object should be placed over the blue flame, above the tip of the flame, where the gases are hottest and there will be no interference with the combustion process, which could result in soot formation.
Explanation:
