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<title>questions 2.45-00</title>
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<p><font COLOR="#CF411D"> 
In the reaction A+B-->C+D, how do we classify which reactants and
products are the substrates?
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Depends on how you are writing the reaction. Reactants, on the left, are
considered substrates in that context, and the compounds on the right are
the products, by definition. 
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