Translation for chemical engineering field

When a chemist studies a chemical reaction, he usually asks himself a question: How fast is it? How was it done? How to choose? Some reactions are very fast, in order to produce a single product. A familiar example is the reaction in which sodium and chlorine form sodium chloride. Other reactions, such as the reaction between hydrogen and oxygen to form water, proceed slowly at room temperature, but are very fast at higher temperatures. They ultimately went to create a single product. Most reactions are indeed very slow. Chemists have found ways to speed it up. If he is lucky, all he can do is increase the temperature (such as in the reaction between hydrogen and oxygen). Unfortunately, increasing the temperature often has undesirable side effects.

When a chemist considers a chemical reaction, he generally asks himself three questions: How fast is it? How complete is it? How selective is it? Some reactions are very fast and proceed to completion to yield a single product. A familiar example is the reaction of sodium and chlorine to form sodium chloride. Other reactions, such as the reaction of hydrogen and oxygen to form water, proceed very slowly at room temperature but are extremely fast at higher temperatures; they ultimately reach completion to produce a single product. Most reactions are indeed very slow. The chemist must find ways to speed them up. If he is lucky, he can do this simply by raising the temperature (as in the reaction of hydrogen with oxygen). Unfortunately, increasing the temperature often leads to undesirable side effects. When a chemist considers a certain chemical reaction, he generally asks himself three questions: How fast is it? How was it completed? How to choose? Some reactions are very fast, and the product formed as a result is single; a well-known example of this is the reaction between sodium and chlorine to form sodium chloride. Many other reactions, such as the reaction between hydrogen and oxygen to form water, proceed slowly at room temperature, but are very rapid at higher temperatures. The products resulting from these reactions are also single. It is precisely because the speed of most reactions is indeed very slow that chemists have to find ways to accelerate them. If he is lucky, he can simply accelerate the process by raising the temperature (such as in the reaction between hydrogen and oxygen). Unfortunately, increasing the temperature often also has undesirable side effects.