Learn about Bunsen Burners What is a Bunsen Burner - historyhistory Video Tutorial – the one minute versionthe one minute version Slow down! – How to Light a Bunsen BurnerHow to Light a Bunsen Burner Notes – parts and steps of use Wednesday you will take a quiz and a performance assessment on using Bunsen burners. You will have to pass the quiz and the performance assessment in order to get your Bunsen burner license. What is the right sequence?

Label the parts air intake combustion nozzle barrel/body tube gas jet (point to inside) base gas valve/dial

Label the parts air intake combustion nozzle barrel/body tube gas jet (point to inside) base gas valve/dial

Functions of Parts – air intake: adjustable; controls amount of oxygen; adding more air makes flame hotter – combustion nozzle: gas and air mix to ignite – barrel: turn this to adjust air intake – gas valve/dial: adjustable; controls amount of gas entering burner; adding more gas makes flame taller – base: holds up Bunsen burner – gas jet: small hole that gas goes through

Steps to Light and Turn Off 1.Wear safety goggles, tie back long hair, no loose clothing. 2.Check striker for sparks. 3.Attach hose to burner and gas line. 4.Turn barrel clockwise to close and then open slightly to let a small amount of air flow. 5.Turn gas valve/dial counter clockwise to close. 6.Turn on gas by rotating valve parallel to hose. 7.Open gas valve/dial slightly – should hear faint hissing. 8.Hold striker at 45 degree angle and light. 9.For a taller flame – open gas valve/dial more to allow more gas. For a shorter flame – turn gas valve/dial back counter clockwise. 10.For a hotter flame – turn barrel counter clockwise (increases air flow). Flame should turn blue. 11.For a cooler flame – turn barrel clockwise (decreases air flow). Flame should turn orange. 12.The ideal flame is pale blue with a darker blue core. Draw a picture of the flame. 13.To turn off: turn barrel clockwise for a cooler, orange flame. Completely turn off the gas valve/dial. Turn off gas line.

Today’s Agenda Complete notes Take written portion of quiz. Passed the quiz? Practice the steps to light the burner and turn off the burner AT YOUR TABLE WITHOUT ACTUALLY USING GAS Performance Assessment of these steps tomorrow. Pass written and performance to get your license.

Today’s Agenda On back of quiz: Please explain WHY the steps are in the SAFEST ORDER. REVISE ANY CIRCLED items on the written Bunsen Burner. You must get 100% PRACTICE: – 1. Goggles and tie back hair. – 2. attach hoses – 3. allow a small amount of air – 4. Close gas valve/dial – 5. Turn on gas line. – 6. Turn on small amount of gas. – 7. Light with striker Performance Assessment for Bunsen Burners Passed both? ??? Flame test lab?

General Steps for Flame Test Make sure your flame test loop is clean. – Put it into hottest part of Bunsen Burner flame. No color change should occur if it is clean. – If it isn’t clean, dip it into acid provided, then put into flame. Repeat until there is no color change. Dip clean loop into solution. Put loop into hottest part of the Bunsen Burner flame. Observe and record the color of the flame for the particular solution. Put the paperclip back in SAME SOLUTION!

12/11/13 Exit Task CANCELLED DUE TO PERFORMANCE ASSESSMENTS. IF TIME – What colors did the flame tests show? Cobalt – Magnesium – Calcium – Barium – Potassium –