pure and mixed substances

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pure substance
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it is made up of only one type of atoms or molecules
about pure substances
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it has fixed melting and boiling points. pure substance could be either compound or element.
element
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it is a pure substance that is made up of only one type of atom.
about element
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it cannot be broken down into any simpler substance physically or chemically. an atom is the smallest part of an element.
compound
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a compound is a pure substance that is made when two or more elements combine chemically in definite proportions. smallest particle of the compound is molecule.
mixture
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mixture is obtained when two or more pure substances are mixed in varying proportions without undergoing any chemical change
characteristics of mixture
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there are 5 characteristics.
1st characteristic
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mixture is made up of two or more types of substances
second characteristic
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in the mixture of the constituents can be combined in any proportion
third characteristics
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the particles of the constituents of a mixture are loosely held and easily identifiable
fourth characteristic
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constituents of mixture reading their original properties
fifth characteristic
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constituents of mixture can be separated by physical methods
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