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15 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Chemistry
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the study of properties and interactions of matter
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Theory
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an explanation based on repeated tests and observations
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explanation
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Scientific Law
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observable fact of nature
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fact
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Democritus
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-440 B.C.
-believed that the atom was the smallest building block -atomos=building blocks |
3
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Aristotle
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-350 B.C.
-4 elements=earth, wind, fire, water -tutored Alexander the Great -Philosopher-believed the power of mind explains everything |
4
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Alchemists
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-more than 4 elements and they got together in different proportions
-Discovered different "pure" substances (not mixed with something else) -known as wizards -made potions -H2O=water=2 hydrogen atoms + 1 oxygen atom |
5
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Transmutation
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change of one element into another element
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change
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John Dalton
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-1803
-building blocks of atoms (billiard balls) -Father of Modern Chemistry -Quaker School teacher -Found that each element is a different kind of "building block" -used the word atoms -atoms combine in a certain ratio to make new things -atoms of the same element are the same -atoms of different elements are different |
9
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JJ Thomson
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-1897
-Plum Pudding Model (jello w/ fruit chunks) -experimented with cathode ray tube -decided atoms actually have TWO parts (mostly positive w/ little negative chunks) -atoms are not solid -found out that when he shot a beam through a CRT, the beam curved when he put a charge on the plates -atoms are not neutral |
7
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Ernie Rutherford
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-1909
-shot radiation to discover that an atom is mostly open space -shot radium at gold (dense & thin) -particles bounced off backwards (he thought it would go through) -atoms are mostly open space |
5
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Niels Bohr
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-energy level model
-improved Thomson & Rutherford's model but not orderly pairs -they are all over the place (paths) |
3
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MODERN THEORY
Erwin Schrodinger & Werner Heisenberg |
electron cloud model
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sky
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MODERN THEORY
James Chadwick |
discovered neutrons- used weight as a clue
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neutral
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MODERN THEORY
Protons & Neutrons |
smaller quarks
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small quirk
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MODERN THEORY
Electrons |
smaller leptons
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small leprachauns
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