CHEM 1A Lecture Notes - Lecture 3: Cathode Ray Tube, Cathode Ray, Atomic Number

• School: UC-Irvine
• Department: Chemistry
• Course: CHEM 1A
• Professor: Sandra Brown

Document Summary

Law of conservation of mass - matter is neither created nor destroyed. Total mass of reactants = total mass of products. Law of definite proportions - all samples of a given compound have the same proportions of their constituent elements. Law of multiple proportions - in a compound with two elements, one element reacts with 1 or more certain number of the other element. All atoms of a given element has same mass and properties that distinguish them from another. Atoms of one element cannot change into another element. Developed a cathode ray tube with electrical voltage on each side. Positive on one side, negative on other. Discovered that a beam of particles (cathode rays) traveled to the positively charged part of the tube. Dropped oil onto a negatively charge apparatus (can control how negative it is) Oil gather electrons from air and never reached the apparatus. By controlling the negativity of the apparatus, the oil fluctuated in height.