The best replacement for rate of reaction is concentration.


The best alternatives to rate of reaction are rated as following:
★★★★★  concentration
★★★★★  enzyme concentration
★★★★★  rate law
★★★  rate constant
★★★  substrate concentration
★★★  rate of formation
★  rate of disappearance
★  instantaneous rate of reaction

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Speaking about rate of reaction, one probably shouldn't forget about enzyme concentration.

Other search terms related to rate of reaction and their ratings are:

★★★★★ enzyme concentration
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