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Ethylene is a common organic compound with the chemical formula C2H4 and the molecular formula CH2=CH2. Ethylene is a colorless, pungent gas commonly used in the production of materials such as synthetic rubber and plastics. In the world of chemistry, chemical formula and molecular formula are two different concepts. 

A chemical formula is a method of representing the type and quantity of elements in a compound by combining chemical element symbols and numbers. The molecular formula is a method of representing the types and quantities of elements in a compound by combining chemical element symbols and numbers. 

The chemical and molecular formulas of ethylene both contain the types and quantities of elements in the compound, but their expressions are slightly different. The chemical formula C2H4 indicates that the ethylene molecule contains 2 carbon atoms and 4 hydrogen atoms, while the molecular formula CH2=CH2 more intuitively indicates that the two carbon atoms in the ethylene molecule are connected by double bonds, and each carbon atom also connects two hydrogen atoms. 

By comparing chemical and molecular formulas, we can better understand the chemical composition and structure of ethylene molecules. In addition to ethylene, many other organic compounds also have their corresponding chemical and molecular formulas, which are concise descriptions of chemical structures, helping us better understand and study the chemical world. 

I hope that through the introduction of this article, readers can have a deeper understanding of the chemical and molecular formulas of ethylene, and also have a clearer understanding of the chemical and molecular formulas.