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Catalysts - presence of platinum In this case platinum is...

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Catalysts   are   substances   that   speed   up   chemical   reactions   but  remain unchanged themselves.  Catalysts work by lowering the required amount of activation energy  for the chemical reaction.  For example, hydrogen and oxygen combine with one another in the 
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Unformatted text preview: presence of platinum. In this case, platinum is the catalyst. In biological systems, the most common catalysts are protein molecules called enzymes. Enzymes are absolutely essential if chemical reactions are to occur in cells....
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