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Molecules and Formulas

This guide introduces molecules and chemical formulas, essential concepts in chemistry. A formula details the elements comprising a compound and the number of atoms of each element present. The subscript numbers indicate how many atoms of each element exist in a unit of that compound. For example, H2O indicates two hydrogen atoms and one oxygen atom, while NaCl shows one sodium and one chlorine atom. Understanding these fundamentals is crucial for studying compounds and their properties.

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Molecules and Formulas

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  1. Mr. Dunnum Molecules and Formulas

  2. What is a formula? • The formula tells you which elements make up a compound as well as how many atoms of each element are present. • The subscript number written below and to the right of each element’s symbol tells you how many atoms of that element exist in one unit of that compound.

  3. What is a Molecule • The smallest complete unit of a compound • Often times they are showed like this • 1 H2O • 3 NaCl

  4. Chemical formulaIndicates the elements in a compound

  5. Elements for the day!

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