Ch2(4-6)Sep3Fa08a

Ch2(4-6)Sep3Fa08a - CHEM 109 General Chemistry University...

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CHEM 109 General Chemistry University of Nebraska FALL 2008
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The Atomic Theory of Matter Dalton’s ___________________________ If two elements form two different compounds, the mass ratio of the elements making up one compound is a whole number multiple of the mass ratio of the elements in the second compound. Carbon monoxide (CO) 32 g of O/12 g of C = 2.67:1 ratio 16 g of O/12 g of C = 1.33:1 ratio
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Continuous Motion of Particles ________________ are always in motion The Atomic Nature of Matter
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The Atomic Nature of Matter Dynamic Equilibrium Most systems move toward equilibrium but at equilibrium the system will ________ _______________ in observable properties.
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Most important for ____________ Either positive or negative. ______________ ______________ The Atomic Nature of Matter Electrical Forces
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Forces that cause a ___________________ to change direction when it passes between the poles of a magnet. The amount of bending can be related quantitatively to the ___________________________ of the particle. The Atomic Nature of Matter Magnetic Forces
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Atomic Architecture There are three elementary particles that make up all atoms: ________________________
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Electrons and Protons The gas discharge tube . A small amount of gas is trapped in a tube that has two ______________________________ When a current is applied, an electrical discharge is observed. The behavior of the ________ particles is __________ on the trapped gas but behavior of the _________ particles is ____________ of the trapped gas.
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Gas-discharge tube (cathode ray tube) In order to have current, you must have movement of charge. Experiments with the CRT showed that atoms were composed of positive and negative charges. cathode (-) anode (+) power supply
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The Discovery of Atomic Structure Cathode rays – The ray of light emitted by the ________ (negative electrode) in a glass discharge tube; travels in _____________ , unless deflected by __________________ fields ; attracted to _________ (positive electrode).
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Ch2(4-6)Sep3Fa08a - CHEM 109 General Chemistry University...

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