1 - 2 Elements, compounds and mixtures
Elements, compounds and mixtures
● ***Element: pure substance ONLY consisting of atoms which all have same atomic
number in their nuclei
● ***Compound: ANY substance composed of identical molecules/formula
units consisting of atoms of ≥2 chemical elements
● ***Mixture: ANY material made up of ≥2 DIFFERENT chemical substances
which are NOT CHEMICALLY COMBINED
● ***Pure substance has fixed melting & boiling point
● ***Mixture may melt/boil over a range of temperatures
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Elements, compounds and mixtures
● ***Element: pure substance ONLY consisting of atoms which all have same atomic
number in their nuclei
● ***Compound: ANY substance composed of identical molecules/formula
units consisting of atoms of ≥2 chemical elements
● ***Mixture: ANY material made up of ≥2 DIFFERENT chemical substances
which are NOT CHEMICALLY COMBINED
● ***Pure substance has fixed melting & boiling point
● ***Mixture may melt/boil over a range of temperatures
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