* Subscripts: The small numbers written below and to the right of an element's symbol in the formula indicate the number of atoms of that element in one molecule of the compound. If there is no subscript, it is assumed to be 1.
* Coefficients: The number written in front of the chemical formula represents the number of molecules of that compound.
Example:
Consider the compound H₂O (water):
* H: The subscript "2" indicates that there are two hydrogen atoms in one water molecule.
* O: The absence of a subscript means there is one oxygen atom in one water molecule.
Therefore, the chemical formula H₂O tells us that one water molecule contains two hydrogen atoms and one oxygen atom.
Another example:
The formula 2CO₂ represents two molecules of carbon dioxide. Each CO₂ molecule has one carbon atom (C) and two oxygen atoms (O). So, in total, there are two carbon atoms and four oxygen atoms in this formula.
Key points:
* Chemical formulas provide a concise way to represent the composition of compounds.
* Subscripts and coefficients are crucial for understanding the relative number of atoms in a compound.
* The chemical formula is the "recipe" for a compound, telling us the exact proportions of each element.
Let me know if you have any other questions!
