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Democritus & Aristotle/ John Dalton

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Democritus & Aristotle/ John Dalton

Democritus

• Democritus was alive 460 B.C. - 370 B.C.

• Was a Greek philosopher • He had no formal education and

learned from his travels through out Greece

Democritus's Theory

• hypothesized that all matter (plus space and time) is composed of tiny indestructible units, called atoms.

• His beliefs were amazingly ahead of his time, but he could not answer what holds atoms together and therefore lost credibility

• *No Experiment*

Page 4: Democritus & Aristotle/ John Dalton. Democritus Democritus was alive 460 B.C. - 370 B.C. Was a Greek philosopher He had no formal education and learned

Democritus• Matter in empty

space that has a different appearance

• Atoms determine properties

Aristotle

• Lived in 384 B.C. - 322 B.C.• Was one of the most influential Greek

philosophers• Was educated at the Plato academy

in Athens for nearly 20 years

Page 6: Democritus & Aristotle/ John Dalton. Democritus Democritus was alive 460 B.C. - 370 B.C. Was a Greek philosopher He had no formal education and learned

Aristotle's Theory• Belief: rejected Democritus' atomic theory,

and he especially didn't agree with the theory that atoms more through empty space, because he didn't believe empty space exists.

• He was supported or considered more credible than Democritus because he already had a good reputation

• He did not believe that atoms exist but that matter is made of earth, fire, air and water

• *No experiment*

Page 7: Democritus & Aristotle/ John Dalton. Democritus Democritus was alive 460 B.C. - 370 B.C. Was a Greek philosopher He had no formal education and learned

Aristotle• Diagram of

Aristotle's theory

Page 8: Democritus & Aristotle/ John Dalton. Democritus Democritus was alive 460 B.C. - 370 B.C. Was a Greek philosopher He had no formal education and learned

John Dalton (1766-1844)

•English school teacher

•From the UK

•School - Pardshow Hall (a Quaker school)

Page 9: Democritus & Aristotle/ John Dalton. Democritus Democritus was alive 460 B.C. - 370 B.C. Was a Greek philosopher He had no formal education and learned

Dalton's Theories• “Dalton's Atomic

Theory”• Matter is composed of

extremely small particles called atoms.

• Atoms are indestructible and indivisible.

• Atoms of a given element have the same size, mass, and chemical properties.

• Atoms of a specific element are different from those of a different element.

• Different atoms combine in simple whole-number ratios to form compounds.

• In a chemical reaction, atoms are separated, combined or rearranged

Page 10: Democritus & Aristotle/ John Dalton. Democritus Democritus was alive 460 B.C. - 370 B.C. Was a Greek philosopher He had no formal education and learned

Dalton's experimental design

• Law of definite proportions

• And that all matter is the same

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