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### 10 Cards in this Set

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 What are the four principles of Daltons' Atomic Theory? 1. Atoms are indivisible 2. Atoms of the same element are identicle 3. Atoms retain their identites in reactions 4. Atoms combine in fixed ratios to form compounds. Indivisible Identicle Identies Fixed Ratios What was Faraday's contribution to quantum mechanics? - He said that charged particles create a field around them fields Summarize the cathode ray experiment. Thomson set up a cathode and an anode connected to a power source. The cathode was behind the anode, the anode had a hole in it to let through the ray. The ray was shot through magnets and electric plates, and based on whether the electrodes or magnet was turned on, the ray was hit different places on the flourescent screen. Based on where it hit, they were able to tell that the ray was made of negative particles. Summarize the conclusion of the cathode ray experiment 1. atoms contain identicle negatively charged particles. 2. The q/m ratio was calculated 3. because atoms contain a negative charge, atoms must contain a postitive charge as well. define the variables F = qE F= force on electron q = charge on the second particle E= Electric field vector F= qV x B F = Force on charged particle q = charge on the charged particle V= velocity of particle B= magnetic field vector What was the results of the millikan oil drop experiment - the charge on an electron was calculated, and using the charge, the mass was calculated. - The mass of the electron was 1/2000 the mass of the atom --> the vast majority of the mass of the atom is positive charge. describe what millikan discovered about the charge of the electron the charge on the oil droplets were integral multiples of a constant charge. Describe Rutherford's experiment Rutherford shot a beam of alpha particles (positivley charged)towards an extremely thin gold sheet. the majority of the particles pass right through. a select few were deflected at high angles, (90, 130 180 degrees) What did Rutherford's experiment show? 1. most of the atom is empty space. 2. there exists a small dense, postively charged center at the center of the atom.