Concept:A compound is formed by chemical combination, while a mixture involves no chemical bonding.
Explanation:In a compound, the constituent elements are chemically combined in fixed proportions and cannot be easily separated by physical means.
In a mixture, the substances are simply mixed together and retain their individual properties, with no chemical bonds between them.
Therefore, the key difference is that constituents of a compound are chemically bound together, while those of a mixture are not.
Answer:C. the constituent of a compound are chemically bound together while those of a mixture are not