Chemical formula
Chemical Formula
A Chemical formula (/kɪˈmɪkəl ˈfɔːrmjʊlə/) is a way of presenting information about the chemical proportions of atoms that constitute a particular chemical compound, using a single line of chemical element symbols, numbers, and sometimes also other symbols, such as parentheses, dashes, brackets, commas and plus (+) and minus (−) signs.
Etymology
The term "Chemical formula" is derived from the words "Chemical" and "Formula". "Chemical" comes from the Greek word "khēmeía" which means "alchemy", and "Formula" comes from the Latin word "forma" which means "form" or "method".
Types of Chemical Formulas
There are several types of chemical formulas, including:
- Molecular formula: It shows the number and type of atoms in a molecule.
- Empirical formula: It shows the simplest ratio of atoms in a compound.
- Structural formula: It shows the arrangement of atoms in a molecule.
- Condensed formula: It is a more compact way of writing the structural formula.
Related Terms
- Chemical compound: A substance formed from two or more elements chemically united in fixed proportions.
- Chemical reaction: A process that leads to the transformation of one set of chemical substances to another.
- Chemical element: A species of atoms having the same number of protons in their atomic nuclei.
- Chemical bond: A lasting attraction between atoms, ions or molecules that enables the formation of chemical compounds.
External links
- Medical encyclopedia article on Chemical formula
- Wikipedia's article - Chemical formula
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