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Tuesday, November 1, 00
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The objective of this lab was to practice proper lab safety and learn how some elements react with fire. For the lab a crucible, tongs, eye dropper, a cooling tray with cover, crucible cover, blue looking chemical that is harmful to your skin, a ceramic triangle, tower looking thing, a round holder for the ceramic triangle, a Bunsen burner, propane, safety glasses, and a safety apron will be needed. First place the ceramic triangular thing on the round thing, which is tightened to the tower looking thing, next turn on the gas your teacher may be needed to do this, then turn on your Bunsen burner, next carefully adjust the round thing on the tower thing, so that when you place the crucible - with its cover on and the blue stuff in it - on the triangular thing its about 4 inches from the top of the Bunsen burner. Next measure out 5 grams of blue stuff on a piece of weighing paper, also measure the crucible w/ cover, then measure the 5 grams of blue stuff with the crucible and its accessory. Next- you guessed it- place the crucible on the triangular thing using a pair of tongs- tongs are used because a fire is HOT, and the school doesnt want to be responsible for a student that has to go to the hospital because of his/her stupidity. NOW back to the lab instructions. Record the weights of the stuff you just weighed. Heat the crucible and its extras for five minutes. Then take the crucible off the triangular thing using the tongs, as the crucible is likely to be hot, next take the cover off the cooling tray and place the crucible in the cooling tray. Place the cover back on the tray. Let the stuff sit for five minutes. Then re-weigh the things you measured before you put it over the fire. You should get a chart like the one on the TOP of the next page.
ß CHART ß
Initial Mass (grams)After-Burning Mass(grams)
Crucible w/ Cover (empty)1.481.48
Blue Stuff5 (duh).1
Crucible, Cover, Blue Stuff4.74.6
After you weigh the stuff, place the blue stuff, which should now be white, on a piece of weighing paper. CAREFULLY drop droplets of water onto the blue/white stuff it should instantly turn back to blue. If it doesnt- YOU BURNED IT & YOUR RESULTS ARE WONT BE RIGHT. After your are finished playing with the water and blue stuff, cleanup your lab area, as their will be another class using the area after you do. And dont eat the blue chemicals because it might go straight to your head and make you really sick or even kill you.
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