CHEM 110 Lecture 4: Energy
Document Summary
Heat is transferred at a constant p. Heat movement [endo-/exo- depends only on heat (q)] Study of light (electromagnetic radiation) interacting with matter. Light behaves as a wave c= v. C= 3. 00 x 10 m/s (speed of light) H= 6. 626 x 10 j s (planck"s constant) E= hc (6. 626 10 34 js)(3. 00 108m/ s) 1mol: what is the energy of a green photon (wavelength= 523 nm) for one mole of photons? a. b. c. =2. 29 105 j/mol: visible light e ___ x 10 j for 1 photon. H gas 4 emission lines in the visible sprectrum. Solid metal salts also emit specific spectra when releasing energy (ex: fireworks) Emission lines seen in all elements are based electronic transitions (e gaining/losing e in an atom) ~dr. Line spectra implies that atoms have discrete (quantized) energy levels. They are a result of electronic transitions (electrons moving from one allowed energy state to another) N= 1, 2, 3, (principal quantum number)
