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

pure and mixed substances