Bimolecular reaction - nibunshihannou (English spelling) bimolecular reaction

Japanese: 二分子反応 - にぶんしはんのう（英語表記）bimolecular reaction

When classifying chemical reactions by the number of molecules in the reaction, this refers to an elementary reaction of the form that involves two molecules. Depending on whether the two molecules are the same or different, it is expressed as A + A- → C or A + B- → D. For example, the reaction 2HI ⇄ _H2 + _I2 is a bimolecular reaction in both the forward and reverse reactions. In actuality, when a reaction occurs due to collisions between two molecules, and the number of collisions is proportional to the product of the concentrations of each component, it becomes a second-order reaction with a rate equation expressed as v = k [A] ² or v = k [A][B]. Here, k is a proportionality constant, known as the rate constant.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

反応の分子数で化学反応を分類するとき，2個の分子が関係する形式の素反応をさす。2個の分子が同種か異種かに応じてA＋A―→CまたはA＋B―→Dのように表される。たとえば反応2HI⇄H₂＋I₂は正反応も逆反応も二分子反応である。実際に2分子間の衝突によって起こる反応で，衝突数が各成分の濃度の積に比例する場合，速度式がv＝k[A]²またはv＝k[A][B]で表される二次反応となる。ここでkは比例定数で，速度定数と呼ばれる。

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