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Science & NatureTest for Gases Flow chart
By MeiLing
Category: Science & Nature. Viewed 937 times. Created October 2013.     Disclaimer.   
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How to identify the gases present.

                 
Place a damp red litmus paper over the mouth of the test tube. Did the litmus paper turn blue?
NO
Place a blue litmus paper over the mouth of the test tube. Did the litmus paper turn red?
NO
Did the gas bleach the litmus paper?
YES
The gas is chlorine.
 

YES


YES



NO



The gas is ammonia.
Bubble the gas into limewater. Is there a white precipitate formed?
NO
The gas is sulfur dioxide.
Place a light splint over the mouth of the test tube. Did the gas extinguish the flame with a 'pop' sound?
NO
Place a glowing splint over the mouth of the test tube. Did the gas re-ignite the splint?



YES




YES


YES
 
The gas is carbon dioxide.
 
The gas is hydrogen.
The gas is oxygen.