11.docx - 1 How did Robert Millikan contribute to our understanding of atoms His oil drop experiments helped us determine how much charge and mass is in

11.docx - 1 How did Robert Millikan contribute to our...

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1.How did Robert Millikan contribute to our understanding of atoms? 2.Describe the similarities and diferences between Democritus’s ideas about atoms and Dalton’s atomic theory. 3.Part of Dalton’s atomic theory states that, when atoms combine to form compounds, they always combine in the same whole-number ratio for a given compound. Explain what this statement means.
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4.Describe how J. J. Thomson’s cathode-ray tube
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Unformatted text preview: experiments were related to one another and to the development of modern atomic theory. They both found ways to find out how to find the mass and charge in a electrons and atom. 5. Challenge Explain why Democritus’s ideas about atoms cannot be called an atomic theory. They weren’t based off an experiment or observation which doesn’t make it a theory. 6. Challenge Describe how Thomson’s cathode-ray tube experiments proved the existence of negatively charged particles He used the vacuum tubes to separate the positive chares and negative charges and the negative charges always went towards the positive charges. When an electric current passes through a vacuum tube, a stream of glowing material occurred. Thompson noticed that the stream would bend toward a positively charged plate. This showed that cathode rays are particles with a negative electric charge. These particles were later named electrons....
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