TRO3_Lecture_ch 09 ppt0

TRO3_Lecture_ch 09 ppt0 - Introductory Chemistry 3rd...

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Roy Kennedy Massachusetts Bay Community College Wellesley Hills, MA Introductory Chemistry , 3 rd Edition Nivaldo Tro Chapter 9 Electrons in Atoms and the Periodic Table 2009, Prentice Hall
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2 Tro's "Introductory Chemistry", Chap Blimps Blimps float because they are filled with a gas that is less dense than the surrounding air. Early blimps used the gas hydrogen , however, hydrogen’s flammability lead to the Hindenburg disaster. Blimps now use helium gas, which is not flammable. In fact, it doesn’t undergo any chemical reactions. This chapter investigates models of the atom we use to explain the differences in the properties of the elements.
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3 Tro's "Introductory Chemistry", Chap Classical View of the Universe Since the time of the ancient Greeks, the stuff of the physical universe has been classified as either matter or energy. We define matter as the stuff of the universe that has mass and volume. Therefore, energy is the stuff of the universe that doesn’t have mass and volume. We know from our examination of matter that it is ultimately composed of particles, and its the properties of those particles that determine the properties we observe. Energy, therefore, should not be composed of particles. In fact, the thing that all energy has in common is that it travels in waves .
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4 Tro's "Introductory Chemistry", Chap The Nature of Light—Its Wave Nature Light is one of the forms of energy. Light is a form of electromagnetic radiation . Electromagnetic radiation is made of waves. Electromagnetic radiation moves through space like waves move across the surface of a pond
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5 Speed of Energy Transmission
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6 Tro's "Introductory Chemistry", Chap Electromagnetic Waves Every wave has four characteristics that determine its properties: wave speed, height (amplitude), length, number of wave peaks that pass in a given time. All electromagnetic waves move through space at the same, constant speed. 3.00 x 10 8 meters per second in a vacuum = The speed of light, c .
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7 Tro's "Introductory Chemistry", Chap Characterizing Waves The amplitude is the height of the wave. The distance from node to crest. Or node to trough. The amplitude is a measure of how intense the light is—the larger the amplitude, the brighter the light. The wavelength ( λ ) is a measure of the distance covered by the wave. The distance from one crest to the next. Or the distance from one trough to the next. Usually measured in nanometers. 1 nm = 1 x 10 -9 m
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8 Tro's "Introductory Chemistry", Chap Electromagnetic Waves
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9 Tro's "Introductory Chemistry", Chap Characterizing Waves The frequency ( ν ) is the number of waves that pass a point in a given period of time. The number of waves = number of cycles.
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This note was uploaded on 01/31/2011 for the course CHEM 152 taught by Professor Selchau during the Fall '10 term at Miramar College.

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TRO3_Lecture_ch 09 ppt0 - Introductory Chemistry 3rd...

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