3. HHooww iiss mmaatttteerr bbrrookkeenn ddoowwnn....
T H E M O L E C U L A R T H E O R Y O F M A T T E R
H O M O G E N E O U S
M I X T U R E
( S o lu t io n )
P U R E
Separated by physical
methods
S U B S T A N C E
H E T E R O G E N E O U S
C O M P O U N D S E L E M E N T S
M I X T U R E
M A T T E R
Separated by
physical methods
Separated by
physical methods
Separated by chemical
methods
7. DDeeffiinniittiioonnss
(Pure) substance: a material which cannot be separated by
physical methods into 2 or more materials which have
different characteristics.
Compounds: a material containing two or more elements or
molecules.
Molecules: A group of 2 or more atoms held together by
strong forces called "bonds".
Atoms: the smallest particle of matter which has
distinctive chemical characteristics, composed of a nucleus
surrounded by electrons.
Elements: a specific substance which cannot be decomposed
into simpler substances by chemical means. An atom with a
specific number of protons, neutrons, and electrons.
20. SSeeppaarraattiinngg MMiixxttuurreess --
LLiiqquuiiddss
HHooww ccoouulldd wwee sseeppaarraattee aa mmiixxttuurree ooff wwaatteerr
aanndd aallccoohhooll??
Alcohol boils at 78°C
Water boils at ? °C
If you heated a mixture of water and
alcohol which would boil first?