# Chemistry

 Symbol for frequency? v Symbol for wavelength? lambda Speed of light? 3.00 x 108 m/s Relationship between wavelength and frequency? c = (wavelength)(frequency) EM Radiation Experiments? (hint: 3) - Blackbody Radiation- Photoelectric Effect- Emmission Spectrum of gases Blackbody Radiation? ~ EM Radiation comes from objects that have been heated~ high frequency, (short wavelength) has a high energy- the inverse is also true - Planck's Constant (h) 6.626 x 10-34 J*s Photoelectric Effect? tiny packets of light, photons, have own unique energyEphoton = hvphotons behave like particles and like waves (duality) Emission Spectrum of Gases? Excited atoms emit light at discrete wavelengthsevery atom gives unique emission spectrumE = hc/lambda principle quantum number n "orbits" of specific size where the energy of the electrons depends on nlower n = lower E and the orbit is closer to the nucleus what causes the "lines" in emission spectra? When an electron falls back to the ground state from an excited state the E emitted as a quantum of light, or photon. this photon represents the "lines". The amount of E absorbed or emitted in promoting or demoting electrons within allowed n levels Change in E = Ef - Ei = [(-RH/n2f) - (-RH/n2i)] Rydberg constant RH = 2.18 x 10-18J Based on the equation, if the change in E is less than 0 and E is given off this is an emission spectrum Based on the equation, if the change in E is greater than 0 and E is absorbed this is an absorption spectrum Based on the equation, if the final energy level is infinity, the electron has been removed completely ionization energy What is the relationship between mass and wavelength? wavelength = h/mass x velocity Heisenberg's Uncertainty Principle uncertainty in position x energy (or momentum) is greater than or equal to h/4 pie wave function the mathematical equation that describes the electrons Angular Momentum Quantum Number (l) defines the shape of the orbitalrange from 0 to n-1we use letter designations in place of l Authorlittledevil_withwings ID48271 Card SetChemistry DescriptionChapter 6 Updated2010-11-11T20:56:18Z Show Answers