Catalyst: Any substance of which a small proportion notably affects the reaction rate of a chemical reaction without itself being changed or consumed.
酶：在活性生物体中起催化剂作用的物质，它调节化学反应中的反应速率而自身不被改变。
This is a discussion on improving the determination of chemical reaction rate in the famous study on kinetics of reaction between ammonium persulphate and kalium iodide.
本文改进了著名的过二硫酸铵与碘化钾反应动力学研究中反应速度的测定，并将测定改为微型化学实验技术。
Reaction rate: Speed at which a chemical reaction proceeds, in terms of amount of product formed or amount of reactant consumed per unit of time.
反应速率：化学反应进行的速度，用单位时间内产物的生成量或反应物的消耗量来表示。
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