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A defining characteristic of a compound is that it has a Chemical Formula . Formulas describe the ratio of atoms in a substance, and the number of atoms in a single molecule of the substance (thus the formula for Ethene is 24 rather than 2). The formula does not indicate that a compound is composed of Molecule s; for example, Sodium Chloride ( Table Salt , ) is an Ionic Compound . Compounds may have a number of possible Phases . All compounds can exist as Solid s. Molecular compounds may also exist as Liquid s or Gas es. All compounds will decompose to smaller compounds or individual Atom s if Heat ed to a certain Temperature (called the Decomposition Temperature ). Every chemical compound that has been described in the literature carries a unique Numerical Identifier , its CAS Number . |
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