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*Chemistry

important people

QuestionAnswer
J.J Thomson (1900's) -Cathode rays are a stream of negatives particles (electrons). -Charge to mass ratio (1.76x10^8 C/g) -Atom is ball of positive charge w/ negatively charged particles embedded (electrons)
Robert Millikan (1900's) -Oil drop experiment -Charge and mass of electron
E. Goldstein (1900's) Found 'canal rays' which are protons
Ernest Rutherford (1900's) -Gold foil experiment -shot alpha radiation at gold foil ~most went straight through ~some deflected (1/8000) -Atom is empty space w/small dense positive region containing atom's mass (nucleus)
John Dalton (17-1800's) -Father of Modern Chemistry
Francis Bacon (1500's) -Heat is motion by very small particles -importance of experiment -facts not derived from authority (contradict held belief)
Galileo (1500's) -proposed there was matter too small to see in chemical changes
Robert Boyle (1600's) -pressure/volume relationship of gases
Lavoisier (1700's) -systematic names for elements -combustion involved material's oxygen -important accurate weight measurements -Law of Conservation of Mass
Proust (1700's) -Law of Definite Proportions ~elements in compound always in same ratio of masses
James Chadwick (1900's) -existence of neutrons -difficult to find because of no charge
Created by: mason23