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Clip(6 min 9 sec) Without an appropriate catalyst some chemical reactions would be so slow as to appear not to occur at all on the human timescale. However, when catalyzed, these reactions can be very dramatic.
Clip(5 min 7 sec) Air is an invisible gas as are hydrogen and helium. How can you tell if a balloon contains hydrogen? Hydrogen has particular physical and chemical properties that can be tested. Dr. Cech enlists student volunteers to show how a chemical reaction can be used to identify a substance.
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