Classification of matter according to chemical composition
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Matter can be ordered into two general classifications: pure substances and mixtures. A pure substance is a form of matter whose properties and composition remain constant over the sample. Physical combinations of two or more elements and/or compounds are known as mixtures.
A pure substance is a type of matter with uniform properties and a constant composition throughout. For instance, regardless of the source from which it is isolated, every sample of sucrose has the same physical properties, such as its melting point, color, and sweetness.
A mixture is made up of two or more different kinds of matter that can be in different amounts and separated by physical processes like evaporation. A mixture keeps the distinct identities of its components.
There are two kinds of pure substances: compounds and elements. Elements are pure substances that cannot be reduced to simpler forms by chemical reactions. Elements include copper, sulfur, oxygen, iron, silver, gold, aluminum, and gold.
A homogeneous mixture, also known as a solution, has a consistent composition and overall appearance. A sports drink, which is made of uniformly mixed water, sugar, flavoring, and electrolytes, is one example of a solution.
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