John Dalton: Atomic Theory
Download
Report
Transcript John Dalton: Atomic Theory
+
John Dalton’s Atomic
Theory
Ryan Templeton, Sam
Sanavi
+
Photos of Dalton
+
Who is John Dalton?
Born September 6, 1766, in Eaglesfield, England
Died July 26, 1844 in Manchester, England
Religious man, he was a Quaker, kept him from his fame
Teacher at the age of twelve, principal 5 years later
Professor at New College in Manchester
+
Studies
First got into meteorology
Researched color blindness which he had
Through his interests in atmospheric pressure he was led to
gases
Studied gases and came up with his atomic theory
+
Dalton’s Atomic Theory
Dalton revised Democritus’s atomic law through
experimental trial.
Believed of extremely small particles known as “atoms”.
Atoms are identical in means of mass, chemistry, size, and
mass.
Atoms cannot be created, divided, or destroyed.
Different atoms combine to form compounds.
In chemical reactions, atoms are separated, combined, or
rearranged.
+
Compared to Democritus’ theory.
Dalton’s atomic theory was a revised version of Democritus’
theory.
Democritus believed of small objects holding mass together
known as Atoms.
Dalton and Democritus believed atoms were indivisible and
invincible.
Dalton thought all atoms were one size, Democritus said all
were different.
Democritus believed that physical traits of an object were
caused by size and movement of atoms; Dalton did not
believe this.
+
Compared to todays theory.
Dalton’s theory was technically valid, but in comparison to
modern atomic theory, it was a bit off.
We know that atoms can be destroyed by nuclear reactions
but not chemical reactions.
We also know that not all atoms are the same. Atoms can
differ by factors such as mass thus making Isotopes.
+
Conclusion
Dalton’s atomic theory was a
necessary and imperative study in
science that showed the true make up
of matter.
Even though some of his theories are
wrong, it can’t be said that his work
was not needed.
His
theory holds theoretical
foundation in science.
+
Websites to look at
http://www.biography.com/people/john-dalton-9265201
http://www.iun.edu/~cpanhd/C101webnotes/composition/d
alton.html