CHEM 1212 Lecture Notes - Lecture 2: Oil Drop Experiment, Cathode Ray Tube, Ernest Rutherford
27 Sep 2016
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Document Summary
Law of conservation of mass- mass is neither created nor destroyed. Law of definite proportion a given compound always contains exactly the same proportion of the elements by mass. Ratio of atoms in a compound always small, whole number, same proportion of elements by mass. You divide the top number by the bottom, and the smaller number becomes 1 and the top number you round up. Co2 same ration every time: dalton"s atomic theory. J. j thomson english physicist interested in atomic structure cathode ray tubes ray = made of electrons ( negatively charged particles) beam of light moved toward positive plate. Robert millikan american physicist oil drop experiment the way the oil falls, changed by voltage plates oil had charge + voltage = change in trajectory. Ernest rutherford gold foil experiment shoot alpha particles at gold foil; expected to pass through with no deflections alpha particles = positive some deflected = positive charge in the nucleus of the atom.
