1. A compound is a molecule that contains at least two different elements. Therefore, all compounds are molecules but not all molecules are compounds.A Compound is two or more different atoms. All compounds are molecules but not all molecules are compounds. Compounds can be destroyed by chemical means. Molecules are very important in a compound it’s the smallest part of the compound that can enter into a chemical combustion. A compound is a substance formed when two or more elements are chemically joined. Water, salt, and sugar are examples of compounds. When the elements are joined, the atoms lose their individual properties and have different properties from the elements they are composed of. A chemical formula is used a quick way to show the composition of compounds.
2. A substance made up of two or more elements joined by chemical bonds into a molecule. The elements are combined in a definite ratio. <ref>The American Heritage. (2002). Student Science Dictionary Houghton Mifflin, Boston.</ref>
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