CHEM 1021 Lecture Notes - Lecture 10: Oil Drop Experiment, Robert Andrews Millikan, William Crookes
Document Summary
1. all matter is made up of small particles called atoms, each type corresponding to a different element. 2. all atoms of a given type are similar to one another and significantly different from all other types. 3. the relative number and arrangement of different types of atoms contained in a pure substance (its composition and structure) determine its identity. 4. chemical change is a union, separation or rearrangement of atoms to give new substances. 5. only whole atoms can participate in or result from any chemical change, since atoms are considered indestructible during such changes. Was possible because of the invention of cathode ray tubes. 5. 686 x 10^-12 kg/c (mass to charge ratio) i. 1. C = coulomb = si unit of charge. Used this along with the charge-mass ratio determined by thomson. Protons were discovered about the same time as electrons. Mass = 1837 x mass of an electron. Due to work of ernest rutherford and hans geiger in 1911.
