chap2 - Chapter 2 2-1 Early Chemical Discoveries and the...

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Chapter 2 2-1: Early Chemical Discoveries and the Atomic Theory law of conservation of mass: “the total mass of substances present after a chemical reaction is the same as the total mass of substances before the reaction”. Mass is not created or destroyed. Law of constant composition/definite proportions: a compound always has the same composition-same mass proportion of constituent elements Dalton's Atomic Theory: each element is made of tiny particles called atoms, which can't be created or destroyed in a chemical change all atoms of an element have the same mass and properties but the atoms of the elements are different from each other in compounds, elements combine in whole # ratios led to law of multiple proportions: if 2 elements form more than 1 compound, the masses of 1 element+fixed mass of the other are in the ratio of small whole #'s 2-2: Electrons and Other Discoveries in Atomic Physics electric charge-positive or negative attract each other. All matter is made up of these charged particles, charge is balanced The Discovery of Electrons cathode ray tube(CRT)-first created by Faraday. Cathode rays emitted by negative terminal of evacuated tube, crossed to positive end. Invisible rays so only detected by
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This note was uploaded on 10/03/2008 for the course CHEM 2070 taught by Professor Chirik,p during the Fall '05 term at Cornell.

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chap2 - Chapter 2 2-1 Early Chemical Discoveries and the...

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