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Chemistry (GR8)
The atomic theory
Combining Atoms
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Provided a more precise description of the atom in
Dalton's
Atomic Theory
John Dalton
Elements are made up of extremely small particles called
atoms
All atoms of a certain
element
are exactly
alike. Atoms
of different elements are
different
Atoms of same elements have the same
sizes,
mass
and chemical properties
Atoms of one
element
combine with atoms of another
element
to form
compounds
A chemical
reaction
does not result in the creation or
destruction
of atoms
A chemical reaction results only in the
separation
,
combination
, or
rearrangement
of atoms
It is the model of the atom
Solid Sphere
Model
Laws based on Dalton's Atomic Theory
Law of chemical
combination
Mass can neither be created nor destroyed in a chemical reaction
Law of
Conservation
of
Mass
A pure compound will always have the same proportion if the same elements
Law of
Constant
(
Definite
) Proportions