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Bunsen burner - PowerPoint PPT Presentation


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Bunsen burner. External View. Bunsen burner. Barrel : to raise the flame to a suitable height for burning or heating. Air-hole: to allow air to enter the burner. Jet : to enable the gas to rush out of the gas supply and to draw in air.

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Presentation Transcript
slide1

Bunsen burner

External View

slide2

Bunsen burner

Barrel: to raise the flame to a suitable height for burning or heating

Air-hole:to allow air to enter the burner

Jet:to enable the gas to rush out of the gas supply and to draw in air

Collar:to regulate the amount of air entering the burner through the air-hole

Base:to support the burner so that it will not topple

Gas tap:to control the flow of gas to the Bunsen burner

slide3

Bunsen burner

Internal View

slide4

Lighting the Bunsen burner

1. Close the air-hole.

2. Put the gas lighter at the top of the barrel.

3. Turn on the gas tap.4. Strike the lighter to get a luminous flame.

slide5

almost colourless zone of complete combustion

blue zone of partial combustion

hottest part

dark zone of unburnt gas

A Non-luminous Flame

Bunsen burner

slide6

Non-Luminous Flame

  • occurs when the air-hole is open, allowing sufficient air into theburner
  • Blue
  • steady
  • very hot
  • hottest part of the flame is just above the tip of the blue zone
slide7

orange zone of incomplete combustion

blue zone of partial combustion

almost colourless zone of complete combustion

dark zone of unburnt gas

A Luminous Flame

Bunsen burner

slide8

Luminous Flame

  • occurs when the air-hole is closed and very little air is allowed to mix with the gas
  • Soot is deposited on apparatus
  • orange
  • appears flickering and unsteady
  • not very hot
slide9

flame at jet

Strike Back

slide10

Strike Back

  • occurs when there is too much air entering air-hole
  • instead of burning at the top of the barrel, the gas burns at the jet
  • when a strike back
  • occurs, turn off burner immediately
slide11

put wire gauze (gauze mat) on tripod stand

  • put beaker of liquid on it
  • light Bunsen burner and then push it under the tripod stand
  • turn off burner when the liquid reaches required temperature

Heating a Liquid in a Beaker

slide12

hold test tube with test tube holder

  • ensure that the mouth of the test-tube is pointing away from myself and others
  • slant test-tube at an angle of about 45O and heat it in the hottest part of a Bunsen flame
  • move the test-tube through flame
  • liquid to be heated should occupy no more than one-third test-tube

Heating a Liquid in a Test tube

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