Flashcards
CHEMISTRY-24
Cards in this deck (10)
- 1Plank:fh
(h: proportionality constant or plank's costant=6.626x10^-34 j.s)
(f or v: frequency) - 2Bohr:angular momentum of e: L= nh/2 π
Energy value of e:
E=- Ry/n^2
(Ry: Rydberg energy=2.18x10^-18) - 3electromagnetic energy of photonE=hc/ λ
E= -Ry/n^2 = -Ry [1/ni^2 - 1/nf^2] - 4Dalton’s atomic theoryDalton’s atomic theory proposed that all matter was composed of atoms, indivisible and indestructible building blocks. While all atoms of an element were identical, different elements had atoms of differing size and mass.
Dalton’s atomic theory also stated that all compounds were composed of combinations of these atoms in defined ratios.
Dalton also postulated that chemical reactions resulted in the rearrangement of the reacting atoms. - 5what are the applications of the Bohr model?- the E of e is quantized
- E of is related to its orbital radius
- at the GROUND STATE level, the e is in its lowest E state.
- this model is also used to explain the following:
1- atomic emission spectrum
2- atomic absorption spectrum - 6atomic emission spectrum:- can be used as a finger print
- each element has a unique atomic emission spectrum - 7H spectral series:Lyman series is a hydrogen spectral series of transitions and resulting ultraviolet emission lines of the hydrogen atom as an electron goes from n ≥ 2 to n = 1 (where n is the principal quantum number), the lowest energy level of the electron.
The Balmer series is the name given to a series of spectral emission lines of the hydrogen atom that result from electron transitions from higher levels down to the energy level with principal quantum number 2. (4 wavelengths in the visible region)
Paschen series are the series of lines in the spectrum of the hydrogen atom which corresponds to transitions between the state with principal quantum number n = 3 and successive higher states. - 8Heisenberge uncertainty principle:The Heisenberg Uncertainty Principle states that you can never simultaneously know the exact position and the exact speed of an object. Why not? Because everything in the universe behaves like both a particle and a wave at the same time.
- it states that the more precisely the position of some particle is determined, the less precisely its momentum can be known, and vice versa - 9Whose theory marks the beginning of the modern era of Chm?Dalton's atomic theory
- 10the Bohr's model does not consider the:repulsion between multiple electrons surrounding 1 nucleus
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- Professional PCAT-Negin (CHEMISTRY) Flashcards on CHEMISTRY-24, created by Negin Rezaie on 10/07/2018.
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- Negin Rezaie
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