This preview shows pages 1–10. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: Continuous Spectrum Tungsten Filament Line Spectrum H atoms Low Pressure Vapor Phase Emissions of Several Elements Discrete energy levels Transitions and the Rydberg Equation ¡ An electron in the lowest energy orbit, n = 1, is in the ground state ¡ An electron in any orbit other than n = 1, is in an excited state ¡ The energy of a line is the difference in the energies of the two orbits involved in the transition Δ E = E final E initial Δ E = h ν = R H { } 1 2 n i 1 2 n f Hydrogen atom spectra Visible lines in H atom spectrum are called the BALMER series . High E High E Short Short λ High High ν Low E Low E Long Long λ Low Low ν Energy Ultra Violet Lyman Infrared Paschen Visible Balmer E n = 2.179x1018 J n 2 6 5 3 2 1 4 n Using The Rydberg Equation Question What is the wavelength of light that corresponds to the transition of the electron from the n = 4 to the n = 2 state of the hydrogen atom. Is the light absorbed or emitted by the atom? Answer: Step 1: Use the Rydberg equation with n i = 4 and n f = 2.6.17 x 10 14 s16.17 x 10 14 s1 Δ E = h ν = R H { } 1 2 n i 1 2 n f R h H ⎛ ⎝ ⎜ ⎞ ⎠ ⎟ { } 1 2 n i 1 2 n f 2.18 x 10 J 6.63 x J s18 10 34 − ⎛ ⎝ ⎜ ⎞ ⎠ ⎟ { } 1 4 2 1 2 2 ν = = = Step 2: Convert to wavelength of light λ = = 4.86 x 107 m = 486 nm 486 nm 3.00 x 10 m / s 6.17 x s 81 10 14 ⎛ ⎝ ⎜ ⎞ ⎠ ⎟ c ν c = λν c = λν Answer continued = The color of this box is ~ 486 nm Bohr model of the Hydrogen Atom • Duality of matter led to the hypothesis that electrons behave as waves....
View
Full
Document
This note was uploaded on 08/06/2008 for the course CHEM 1B taught by Professor Watts during the Winter '08 term at UCSB.
 Winter '08
 Watts
 Chemistry, Atom, Electron, pH

Click to edit the document details