learn about bunsen burners what is a bunsen burner - historyhistory video tutorial – the one...

Learn about Bunsen Burners• What is a Bunsen Burner - history• Video Tutorial – the one minute version• Slow down! – How 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 Off1. 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 –