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Chapter 2

# Chapter 2 - Chapter 2 Atoms and the Periodic Table Q A...

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Chapter 2 Atoms and the Periodic Table Q: A volumetric flask has a mass of 75.0 g. it is filled with a liquid that has a density of 2.300g/ml. afterwards the volumetric flask is weighted again and found to have a mass of 801.3 g. What is the volume of the liquid? A: 315.8 mL Atoms First F= Q1xQ2/ r12 ^2 U= Q1xQ2/ r12 An atom is the smallest quantity of matter that still retains the properties of matter An element is a substance that cannot be broken down into two or more simpler substances by any means Ex. Gold, oxygen, helium Subatomic particles and atomic structure J.J. Thompson English physicist 1856-1940 Cathode ray tube experiment: when connected to a high voltage power supply, a glowing area is seen emanating from the cathodes Electrons: negatively charged particle Studied the effect of placing an electric field around tube Charged matter is attracted to an electric field Lights path… R.A. Millikan (1868-1953) Determined the charge on an electron by examining the motion of tiny oil drops The charge was determined to be -1.6022x10^-19 C

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Chapter 2 - Chapter 2 Atoms and the Periodic Table Q A...

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