PROPERTIES OF FLAMES ~ i 7 t l E I E RBURNER S W
Submitted by: William H. Eberhardt, Georgia Institute of Technology, Atlanta Checked by:
-wms rw INC
Gertrude Weishaar, Fairfield High School, Fairfield, Mont.
PREPARATION
Provide illuminating gas and cylindwx of oxygen and ammonia. Assemble apparatus as shown, using glass tubing (20-mm od) 20 cm long. Fit a stopper onto a 20-em length of 12-mm od glass tubing and insert into the larger tubing. Use a short length of rubber tubing to attach the l Z m m tube to a hand torch. The larger t,nbe may be capped with a Meker burner screen. DEMONSTRATION
With the screen in place, light the gas and notice two cones. Tim ant the flame, remove the screen, turn on gas but not the oxygen, and light again.
Note the character of the flame.
Turn oxygen on slowly. A point will be reached where the flame will strike back so that part bums colorless on top and part burns on the top of the small inner tube. Discuss the chemistry of the flames. What species are re-
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sponsible for the radiation in the inner cane? Repeat the above procedure using NIfa gas. REMARKS
Smaller diameter tubes may be used, such a s 15 and 5 mm od. The length should remaill the same. There is less dancer of the glass shattering with ke smaller tubes. A safety shield is recommended in any ease. A cork stopper which can slide up and dawn inside the outer tube makes it easier to separate the flames.
JOURNAL OI C X E Y I C A G EDUCATION
.
APRIL
1967
