Hydrogen emission spectrum Flashcards
The electromagnetic spectrum
contains all electromagnetic radiation arranged in order of frequency and wavelength
Frequency and energy equations of electromagnetic radiation
E= hf
E= energy
h= planks constant
f= frequency
h is constant so energy and frequency are directly proportional
calculations for wavelength and frequency
C= f x wl
speed of light= frequency and wavelength
c is constant and therefore frequency and wavelength are inversely proportional
use Avogadro number to get j/mol
Wavelength and frequency
UV has shortest wavelength and highest frequency and infrared has the longest
(UV is fast and short and infrared is long and slow)
summary of absorption and emission
-energy absorbed= atom enter excited state
-unknown materials can be identified by comparing them with known materials
–most light absorbed/ emitted is ultraviolet and visible
absorption spectrum
certain frequencies of light are ABSORBED after being EMITTED from an outside source
Emission spectrum
certain frequencies of light are EMITTED after ABSORBING energy from an outer source
The balmer series
-when an excited electron falls into the second shell of energy it falls into the visible light region
-appears as coloured lines
each colour (balmer)
violet= from 6 to 2
violet/ blue= from 5 to 2
blue= 4 to 2
red- 3 to 2
(less it falls the closer to red it appears)
mer= colourful
Lyman series
when the excited electron falls to the first shells and appears as UV which can be detected electronically)
man= manmade
convergence limit
The point where the spectral lines get so close together they converge
this is because shells further from the nucleus are much closer together (less difference)
equation?
convergence frequency= ionisation energy
