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

pure and mixed substances