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a In this exercise, you will develop yi Attach the tubing ofa Bunsen bumer to the gas outlet on the desk. I @, . Light the Bunsen burner with the striker. DO NOT PLAY WITH THE STRIKER - FLINTS ARE EXPENSIVE! i Page 1 of 4 Period BASIC LABORATORY SKILLS our skills in several techniques that are used in performing laboratory experiments. ‘You will also leam how to take measurements with the correct amount of precision, Attach the tubing of the Bunsen bumer to the gas valve. Fully close the barrel (air supply) turing clockwise and needle valve (gas supply) turning counterclockwise. Reopen each of these with a single complete turn, allowing only a very small amount of gas flow through the Bunsen burner. Completely tum on the gas valve by pulling the switch away from the wall. (Against the wall = gas off, away from wall = gas on.) Open and close the needle valve (the thing that looks like a gear at the bottom of your Bunsen bumer. Record your observations as you move the needle both directions. Note the intensity, color, and height of the flame. ‘he Mark, the htell on Agpauits E Le wall { lop ; ¥ ; ol ‘leer he ae hem gah We leeseeveat bt ine Clackuhe 4maller Clam Hater fe, Blve Lire Count dodevhe: (rye Flame 1044 Hat free Ove curl yllrs Regulate the flow of gas so flame extends roughly 8 cm above the barrel - this h¢ight is equivalent to about the width of your hand. Use the needle valve and barrel to accomplish this goal. Now adjust the supply of air until you have a quiet, steady flame with a sharply defined, light blue inner cone. This adjustment gives the highest temperature possible with your burner. This is the most ideal setting for your Bunsen bumer for laboratory work - YOUR FLAME SHOULD NOT HAVE ANY YELLOW OR ORANGE COLOR TO IT. Using Crucible tongs, insert a 10 cm piece of copper wire into the flame just above the barrel. Lift the wire slowly up through the flame. Where is the hottest portion of the flame located?_How can you tell? Also, draw a picture sketch to indicate the hottest portion of the flame. Ee | tatteap | The op the Bye t) The hell () eae Up Cofpey Curshd-on bre, Scoales ¢ . Tum off the Bunsen bumer by moving the gas switch completely toward the wall. Before you put either the Crucible Tongs or Bunsen bumer away, please give them a chance to cool off! DO NOT PUT ANY HOT ITEMS INTO THE RLASTIC BINS. 
