1. The reactants in the chemical reaction were mixed together in a beaker.
这个化学反应中的反应物被混合在一个烧杯中。

2. The concentration of the reactant will affect the rate of the reaction.
反应物的浓度会影响反应的速率。

3. The reactant was slowly added to the solution in order to control the reaction.
为了控制反应，反应物被缓慢加入到溶液中。

4. The reactants undergo a series of chemical changes to form the final product.
反应物经历一系列的化学变化来形成最终的产物。

5. It is important to measure the exact amount of each reactant before starting the reaction.
在开始反应之前，测量每种反应物的确切量是很重要的。

6. The reactants reacted quickly, leading to the formation of a new compound.
反应物迅速反应，导致新化合物的形成。