Chemical reaction is a process that is caused by a chemical change occurred and resulted in a new substance which has altered properties. The reaction requires 2 or more starting chemicals to which these chemicals called the area "the precursor.
Reaction is caused by a chemical process that changes the results in a new substance which has changed from the original. The reaction requires two or more precursor chemicals, chemical precursors, called these "precursor.
.Chemical reaction is a process which is caused by the chemical changes and result in เกิดส to up, which has changed from the original. Chemical reaction to chemical precursors 2 or more"The precursor .