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Classifying matter (compounds (examples (CH4 (methane), N20 (nitrogen),…
Classifying matter
compounds
a substance made from two or more elements
elements in a compound con not be separated by physical means
atoms join together
millions of compounds
all compounds are molecules
not all molecules are compounds
examples
CH4 (methane)
N20 (nitrogen)
NaCi (salt)
H2O (water)
substances
matter with definite chemical composition
characterized matter by a constant composition
can be an element or a compound
can not be a mixture
matter that exist in its pure substance
usually calles a pure substance
examples
H2O (water)
H2 (hydrogen)
Ne (neon)
separating mixtures
simple distillation
separates the liquid from a solution
fraction distillation
separate a solution from miscible liquids
filtration
separates a insoluble solid from a liquid
magnetism
used to separate a mixture that one part has magnetic properties
paper chromatography
used in food
separating funnel
separate two liquids that not dissolve together
elements
a substance made from only one type of atom
made up from atoms
atoms
are the smallest thing to exist in an element
is made up of
protons
electrons
neutrons
are not always join up with each others in elements
some atoms can join up together
when two or more atoms join up they form a molecule
pure in nature
vary in size as long as the atoms join
mixtures
formed of little bits of one or more susbstances mixed together
parts can be separated
doesn't involve any chemical reactions or bonds
types of mixtures
can involve two or more substances
can vary a lot
can be homogeneous or heterogeneous
homogeneous
involve mixing substances
when a sample of matter has the same composition
substances formes appears to have the same chemical composition
heterogeneous
a substance that doesn't have uniform properties
include colloids emilsions or suspensions