Did Aristotle agree with Democritus' concept?
No, he believed in the elements fire, water, earth, and air.
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
Law of Definate Porportion
regardless of the size of the sample, a chemical compound will always contain the same elements of the same porportions
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
found out that energy was connected to frequency based on the # planck's constant. Studied color lines
came up w/ bohr model; an electron heated at ground state jumps to excited state and releases a photon color