what is compound
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A compound is a substance that is composed from two or more different elements. Water (H2O), table salt (NaCl), carbon dioxide (CO2), methane (CH4) and chlorophyll (C55H72O5N4Mg) are a few examples of compounds. They are compounds because they each contain more than one kind of element.
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chemical compound is a chemical substance composed of many identical molecules composed of atoms from more than one element held together by chemical bonds.
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