Chemical Combination Laws


  • Joyce Blair Easter Virginia Wesleyan University


Atoms combine to form compounds, the identity of which is determined by the number and types of atoms it contains and represented by the chemical formula.  Early experiments demonstrated that elements combine in particular ratios, which are stated in the Law of Definite Proportions, the Law of Multiple Proportions, and the Law of Conservation of Mass. The chemical combination laws can be used to demonstrate the relationship between mass, moles, and numbers of atoms or molecules represented by the chemical formula. 

After completing this activity, students will be able to recite the chemical combination laws; define, interpret, and write a chemical formula; and calculate formula mass for compounds.

Level: Undergraduate

Environment: Classroom

Activity Type: Learning Cycle

Discipline: Chemistry

Course: General Chemistry / Introductory Chemistry

Keywords: Conservation of Mass, Definite Proportions, Multiple Proportions, Chemical Formula, Formula Mass, Mole, Avogadro's Number




How to Cite

Easter, J. B. (2022). Chemical Combination Laws. POGIL Activity Clearinghouse, 3(1). Retrieved from



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