Respuesta :
An atom, the substance retain their individual chemical and physical properties.
Answer: mixture
Explanation:
Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass. It can be decomposed into simpler constituents using chemical reactions. The elements do not retain their individual chemical and physical properties. Example: water [tex]H_2O[/tex]
Mixture is a substance which has two or more components which do not combine chemically and thus retain their individual chemical and physical properties. The components do not have any fixed ratio in which they are present. Example: Air
Chemical reaction is a reaction in which chemical composition of substances change.
