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Bunsen burner External View. Bunsen burner Barrel: to raise the flame to a suitable height for burning or heating Collar: to regulate the amount of air.

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Presentation on theme: "Bunsen burner External View. Bunsen burner Barrel: to raise the flame to a suitable height for burning or heating Collar: to regulate the amount of air."— Presentation transcript:

1 Bunsen burner External View

2 Bunsen burner Barrel: to raise the flame to a suitable height for burning or heating Collar: to regulate the amount of air entering the burner through the air-hole Gas tap: to control the flow of gas to the Bunsen burner Air-hole: to allow air to enter the burner Base: to support the burner so that it will not topple Jet : to enable the gas to rush out of the gas supply and to draw in air

3 Bunsen burner Internal View

4 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.

5 dark zone of unburnt gas blue zone of partial combustion almost colourless zone of complete combustion hottest part Bunsen burner A Non-luminous Flame

6 occurs when the air-hole is open, allowing sufficient air into the burneroccurs when the air-hole is open, allowing sufficient air into the burner BlueBlue steadysteady very hotvery hot hottest part of the flame is just above the tip of the blue zonehottest part of the flame is just above the tip of the blue zone

7 dark zone of unburnt gas blue zone of partial combustion almost colourless zone of complete combustion orange zone of incomplete combustion Bunsen burner

8 occurs when the air-hole is closed and very little air is allowed to mix with the gasoccurs when the air-hole is closed and very little air is allowed to mix with the gas Soot is deposited on apparatusSoot is deposited on apparatus orangeorange appears flickering and unsteadyappears flickering and unsteady not very hotnot very hot

9 Strike Back flame at jet

10 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

11 put wire gauze (gauze mat) on tripod stand put wire gauze (gauze mat) on tripod stand put beaker of liquid on it put beaker of liquid on it light Bunsen burner and then push it under the tripod stand light Bunsen burner and then push it under the tripod stand turn off burner when the liquid reaches required temperature turn off burner when the liquid reaches required temperature Heating a Liquid in a Beaker

12 a Liquid in a Test tube Heating a Liquid in a Test tube 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 45 O and heat it in the hottest part of a Bunsen flame slant test-tube at an angle of about 45 O and heat it in the hottest part of a Bunsen flame move the test-tube through flame move the test-tube through flame liquid to be heated should occupy no more than one-third test-tube liquid to be heated should occupy no more than one-third test-tube


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