This contribution examines three different controversial questions that arise in the everyday practice of chemical kinetics. First, it is argued that concentrations should be used as independent variables in rate equations rather than activities. The occasional use of activities in this context might be a result of a false analogy with well-established thermodynamic practices. Second, it is argued that termolecular elementary reactions might be more common than generally assumed. Formulas are derived to calculate the frequency of three-body collisions and it is pointed out that this frequency is often larger than the rates of third-order reactions. Finally, two experimental examples (exponential curves and Michaelis–Menten kinetics) are shown in order to demonstrate how misleading it can be to use linearized formulas for quantitative evaluation.

该文稿研究了在化学动力学的日常实践中出现的三个不同的有争议的问题。首先，有人认为，浓度应作为速率方程中的自变量而不是活动。在这种情况下偶尔使用活动可能是与公认的热力学实践进行错误类比的结果。其次，有人认为，分子基本反应可能比普遍认为的更为普遍。推导了计算三体碰撞频率的公式，并指出该频率通常大于三阶反应的速率。最后，显示了两个实验示例（指数曲线和Michaelis-Menten动力学），以证明使用线性化公式进行定量评估有多大的误导性。