Chemical reaction is a process that is caused by the chemical changes, resulted in a new substance which has altered properties. The reaction requires the initial chemicals of 2 or more of these chemicals, called "precursor" (reactant) per reaction and cause changes in chemical properties, in which the formation of new compounds that the so called "product" (product). At last Some products may contain chemical properties that differ only slightly from the precursor, but at the same time, certain products may vary slightly from the precursor of it completely.
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