•Mixture refers to the physical combination of two or more substances in which the identities of the individual substances are retained.
•Heterogeneous Mixture is a mixture of two or more chemical substances (elements or compounds), where the different components can be visually distinguished and easily separated by physical means.
•Homogeneous Mixture is a mixture of two or more chemical substances (elements or compunds), where the different components cannot be visually distinguished.
•Pure Substance is a form of matter that has constant chemical composition and characteristic properties.
•Element 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 element.
•Compound 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 substance through a chemical reaction, such as water, form a chemical compound. All compounds are substances, but not all substances are compounds.
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