Chemistry

Which of these is a chemical form of communication?

More Questions from Chemistry
Which element has the lightest atomic weight?
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What is the third most abundant gas in the earth's atmosphere?
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What was the fifth unearthly element from the days of Aristotle?
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What halogen is extremely rare and is considered one of the rarest naturally occurring elements on Earth?
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What state of matter takes a shape of its own?
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What is the chemical combination of silicon and oxygen called?
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What symbol appears on the periodic table for the element with the atomic number 92?
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Which do people use in a swimming pool?
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