is a form of matter that has constant chemical composition and characteristics
mixture refers to the physical combination of two or more substance in which the identities of the individual substances are retained
elements is a chemical substance that is made up of a particular kind of atom and hence cannot be broken down or transformed by a chemical reaction into different elements
compounds is a chemical substance that is composed of a particular set of molecules or ions that are chemically bonded.two or more elements combined into one subtance through a chemical reaction,such as water,from a chemical compound.all compounds are subtances,but not all subtances are compounds
homogeneous mixture is a mixture of two or more chemical subtances (elements or compounds),where the different components cannot be visually distinguished
heterogeneous mixture is a mixture of two or more chemical subtances (elements or compounds),where the different components can be visually distinguished and easily seperate by physical means.
elements (made up of the same atom or same molecule respectively), while mixtures are an assortment of different substances put together.An element is a material that consists of a single type of atom.
mixture that is often considered to be a pure substance.A pure substance, any compound or element, can't be separated into different atoms by physical methods
