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Compounds in which at least some of bonds have ionic character stronger than covalent or metallic. Many compounds called salts are ionic compounds but not all of them.
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Is a non-compound molecule a chemical substance?
The Wikipedia definition of chemical substance states:
A chemical substance, also known as a pure substance, is a form of matter that has constant chemical composition and characteristic propertie …
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Is a non-compound molecule a chemical substance?
Found that the answer is 'Yes' in the IUPAC Gold Book definition of chemical substance:
chemical substance
Matter of constant composition best characterized by the entities (molecules, formul …