How can we help?

You can also find more resources in our Help Center.

15 terms

Test #2A

STUDY
PLAY
Democritus
came up w/ the concept of the atom
Did Aristotle agree with Democritus' concept?
No, he believed in the elements fire, water, earth, and air.
Lavoisier
found out that the total mass of reactants was = to the total mass of products; Law of Conservation
Law of Conservation
mass is neither created nor destroyed during ordinary chemical reactions or physical changes
Proust
law of definate porportion (proust's law)
Law of Definate Porportion
regardless of the size of the sample, a chemical compound will always contain the same elements of the same porportions
Dalton
proposed the 1st atomic theory; law of multiple porportions
5 postulates
1.) all matter is composed of atoms
2.) atoms of the same element are identicle
3.)atoms can't be subdivided, created, nor destroyed
4.) atoms of different elements combine to form compounds
5.) during chemical reactions, atoms are combined, separated,or rearranged
Law of Multiple Porportions
In a compound of 2 of the same element, the mass of the second element combines with that of the 1st element, and it's ration consists of small whole numbers
Thomson
designed the plumb pudding model which explained the distribution of electrons
Milikan
used an oil drop experiment that suspended electrons long enough for him to measure mass
Planck
found out that energy was connected to frequency based on the # planck's constant. Studied color lines
Bohr
came up w/ bohr model; an electron heated at ground state jumps to excited state and releases a photon color
Broglie
electrons moved in a wave function
Schrodinger (aka math guy)
created data that better explains where electrons are located in the atom