29832
Plots of initial rate versus [ substrate ] show a rate dependence that evolves from first - order at low concentration to zero - order at high concentration , and this is consistent with a reversible substrate - catalyst interaction preceding an irreversible step .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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