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Chemistry, Week 3

by: eshumaker1328

Chemistry, Week 3 CHM 115 04


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Red is important Green is description Pink are examples and equations
Principles of Chemistry I
Dr. Barrows
Class Notes
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This 4 page Class Notes was uploaded by eshumaker1328 on Thursday September 15, 2016. The Class Notes belongs to CHM 115 04 at Grand Valley State University taught by Dr. Barrows in Fall 2016. Since its upload, it has received 4 views. For similar materials see Principles of Chemistry I in Chemistry at Grand Valley State University.

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Date Created: 09/15/16
Tuesday, September 13, 2016 Chemistry: Week 3 Electromagnetic Spectrum - Comparison of Properties • wavelength - crest-crest / trough-trough measurement - units of distance (nanometers) • frequency - cycles per second - hertz (Hz, s^ -1) • velocity - how fast light is moving through - moves at the same speed if they are traveling through the same medium amplitude • 1 Tuesday, September 13, 2016 - AM / FM stations - height of wavelength • energy - Relationships between Properties • (λ)wavelength and frequency - wavelength goes up, frequency goes down • energy and (v) frequency - as energy goes up, frequency goes up • energy(E) and wavelength - as energy goes up, wavelength goes down Key Equations Key Constants Key Conversions c = λv speed of light c= 2.9979 x 10^8 nano m/s E =hv Plancks constant h= 6.62607 x micro 10^-34 Js kilo mega (10 ^6) giga (10 ^9) CONVERSION CHART: 2 Tuesday, September 13, 2016 Chapter 6: Wave - Diffraction Occurs [one-slit experiment] • can see nodes and troughs • Einstein - Interference [Two-Slit Experiment] Black-Body Radiation - “should have infinite intensity” using the theory/prediction: UV catastrophe - Max Planck’s inadvertent solution • created mathematical “fudge factor” in order to match experimental data • E = nav, n = 1, 2, 3 • only worked if energy was quantized - no explanation/evidence for it Photoelectric Effect [Einstein - Nobel Prize] - only some wavelengths of light will cause metals to lose electrons - changing the intensity will not make it ^^ happen - some light worked but some didn’t • some intensity did and didn’t - Law of Conservation of Energy • potential Energy - analogy to gravitational pot. energy - turns into “stored” energy • kinetic energy • hv = KE + ϕ • if high enough it can EJECT an electron, work function = ϕ • if you send in light that doesn’t have enough energy, it will not get past the threshold needed to pass through 3 Tuesday, September 13, 2016 - if we know what the power is in the atom, we can find out where electrons can be located - Photoelectron Spectroscopy Spectra - Types • Black- body emitter - get a continuous spectrum - gas absorbs certain colors • if you use high-voltage, you can get a bright line spectrum • you get different patterns Observations - gases emit light when exposed to high voltages Bohr’s Model (1913) - Electrons exist in orbits around the nucleus • only at certain distances - light absorbed or emitted when electrons “jump” between orbits - When the electron moves up in an orbit, it becomes less stable [PE increases] 4


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