Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
15 Cards in this Set
- Front
- Back
|
Particle theory of matter
|
made by democritus, cme up with the idea of an atom beign the smallest subunit
|
|
|
Aristole
|
rejected the idea of the atom, ideas were lated rejected
|
|
|
law of conservation of mass
|
matter can be neither created or destroyed by oridinary chemical reactions or physical changes
|
|
|
law of definite proportions
|
same element in exacly teh same proportion will have the same mass no matter the sie of the smaple or the source of the compound ex: NaCl
|
|
|
law of multiple proportions
|
two or more compounds with same elements then the ratio of the first will always be uneven ex: oxygen and carbon and carbon monoxide and carbon dioxide
|
|
|
Dalton's Atomic Theory
|
1. made of atoms
2. identical in size, mass, and other properties 3. atoms cant be subdivided 4. whole number ratios 5. in chemical reaction they rearrange |
|
|
Modern Atomic Theory
|
1. composed of atoms]
2. atoms of one element are differnet in properties from another element |
|
|
protons
|
in nucleus,neutral with equal numbers of p and n, 1.673*10^-27
|
|
|
electrons
|
surround nuclues, very large, large charge to mass ratio, 9.019*10^-31
|
|
|
neutrons
|
in nucleus, 1.675*10^-27
|
|
|
cathode ray
|
electric current was run through various gasses at low pressures, surface of tube opposite of cathode glowed, rays were defelcted by a magnetic feild, deflected by a negative charged object
|
|
|
Thomson
|
gave us the "electron"
|
|
|
Millikan
|
measured the charge of the electron, 9.019*10^-31
|
|
|
Rutherford
|
bombarded gold foil with alpha particles, thought that it must haev been defelected by a bundle of postively charged
|
|
|
nuclear force
|
proton-neutron, proton-proton, neutron-neutron nonds that hold the particles in place
|
