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8 Cards in this Set
- Front
- Back
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What is chemistry |
Study of behaviors and properties of matter |
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What is matter |
Anything that occupy space and have a mass |
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Theory of empedocles |
All things are made up of water fire air earth |
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Who introduced the golfball model? |
John Dalton in1808 |
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What are the four postulates related to the golf ball model? |
01. Elements are made up of extremly small, invisible, indivisible particles 02. Atoms can not be created or destroyed 03. All atoms of a given element is same in size and mass, but not similar to the atoms of another element. 04. Compounds are formed by the union of 2 or more atoms of different elements ina simple numerical ratio |
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Who introduced the electron without experimental evidence? |
Johnstone G Stoney |
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Who introduced the crooks tube? |
William Crooks |
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What are the properties of cathode rays? |
01. Cathode rays travel in straight lines. (Experiment with an opaque object which gives a shadow with sharp margins) 02.cathode rays are beam of particles with a mass and posses kinetic energy ( experiment with a paddle wheel) 03. Cathode rays are negatively charged particles ( experiment with an electrical field and a magnetic field) 04. Nature of cathode rays not depend on the type of the gas and cathode material. 05. e/m value is constant for cathode rays |
