type of chemical which can change the appreance

you folks, do you know which type of chemical changes the physical appreance like colour, milky etc. when a gas touches it. i need about 3 pairs, beside limewater and the carbon dioxide?

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Plus Minus23/03/2007 12:12:45 AM
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sultana
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Plus Minus26/03/2007 10:19:01 PM

Here are heaps of example.

scroll down to the purple section for the Gases.
hope it help.

http://www.wpbschoolhouse.btin...


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