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chem quiz 3
| Question | Answer |
|---|---|
| λ | wavelength(m) |
| v | frequency(1/sec, sec^-1, Hz) |
| larger wavelength= | less energy |
| c= | speed of light |
| E of photon= | planck's constant(h) frequency(v) and planck's constant(h) speed of light(c)/wavelength(λ) in units of Joules |
| higher frequency= | higher energy |
| higher wavelenth= | lower energy |
| higher frequency= | lower wavelength |
| h= | planck's constant |
| transmission | light passes through system |
| scattering | light bounces off particles in system |
| absorption | light is taken in by system and increases energy of system |
| emission | light is generated by system and decreases energy of system |
| Energy of photon= | change in electron energy |
| In Rydberg equation, Z= | atomic number=number of protons |
| In Rydberg equation, n= | the electron energy level(n=1,2,3...) |
| The Rydberg equation is used to | Predict the energy of a single electron based on it's level |
| Watts(W)= | J/s Joules/sec |
| Hz= | sec^-1 |
| for absoption, ΔE should be... | positive |
| for emission, ΔE should be... | negative |
| The Rydberg equation is ONLY for... | hydrogen-like atoms(they have one electron) |
| binding energy: | the energy required to remove a given electron from an atom (get to the E=0) |
| to determine energy of electrons in multi-electron atoms(non-hydrogen-like atoms)? | Photoelectron spectroscopy (PES) uses high energy photons to eject electrons and measure the electron's binding energy, by measuring the kinetic energy of the ejected electron(s) |
| Binding energy= | Energy of the photon - excess kinetic energy |
| Kinetic energy= | energy of the photon-binding energy |
| Rydberg eq energy of atom with electron in energy level 'n'= | (-Z^2 Rh)/n^2 |
| Binding energy is always... | positive |
| plancks constant(h) | 6.626x10^-34 j/sec |
| speed of light(c) | 2.99x10^8 m/sec |
| rydbergs constant. (Rh) | 2.18x10^-18 J |
| Rydberg equation can be rewritten as: Where Rh= | 1/λ=R(1/nf^2−1/ni^2ni) hcR |
| R= | Rh/hc |
| c= | (λ)(v) |
| When atoms are excited with energy, they emit specific wavelengths of light. Why? | There are various electronic energy levels in atoms and mlcls |
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