Atoms, Molecules, And Ions Worksheet - Chapter 2 Page 2
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27Joseph Proust
Law of Constant Composition
(1754–1826)
• Also known as the law of definite
proportions.
• The elemental composition of a pure
substance never varies.
• Basis of Dalton’s Postulate #4
Antoine Laurent
Law of Conservation of Mass (Matter)
Lavoisier
• The total mass of substances present at the
(1743-1794)
end of a chemical process is the same as the
mass of substances present before the process
took place.
• Basis of Dalton’s Postulate #3
• Can’t create matter in a chemical reaction!
John Dalton
(1766-1844)
Law of Multiple Proportions
• If two elements A and B combine to form
more than one compound, the masses of B
that can combine with a given mass of A are
in the ratio of small whole numbers.
Discovery of
Atomic Structure
Mid 1800’s – scientists studied electrical
discharge through partially evacuated tubes.
Path of cathode rays deflected by presence of a magnet.
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