Which statement is incorrect?  A. All molecules are compounds but not all compounds are molecules. (Semua molekul adalah sebatian tetapi tidak semua sebatian adalah molekul.) B. A molecule is formed when two or more atoms join together chemically. (Molekul dibentuk apabila dua atau lebih atom bergabung bersama secara chemical.) C. A compound is a molecule that contains at least two different elements. (Sebatian adalah molekul yang mengandungi sekurang-kurangkan dua unsur yang berbeza) D. All compounds are molecules but not all molecules are compounds. (Semua sebatian adalah molekul tetapi tidak semua molekul adalah sebatian.)

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Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".