Chemistry

Which of these is a chemical form of communication?

More Questions from Chemistry
What alkali metal is highly radioactive and decays into either astatine, radium, or radon?
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Heavy water contains what isotopic form of hydrogen?
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What symbol appears on the periodic table for the element with the atomic number 22?
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What three components are needed in order to produce fire?
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Who discovered calcium and barium?
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What metal is used in airplanes for its lightweight properties?
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Which atomic particle is outside the nucleus?
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Oxygen can also be created by humans by using what process, where electricity passes through water?
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