Compound and mixture both represents combination of elements with significant differences. From both the chemistry and physics perspective, there can be a different kind of solid, liquid or gas elements. There is a number of ways these elements can be combined (Lewis, 1916). When two or more chemicals are combined in such a way that their chemical properties have been changed, it is a compound.
When two or more chemicals are combined in such a way that their chemical properties are not changed, it is a mixture. The elements of compounds are ...