Absorption and Emission Spectra

poppyekoronka
Mind Map by poppyekoronka, updated more than 1 year ago
poppyekoronka
Created by poppyekoronka almost 7 years ago
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AS level Chemistry (Elements of Life) Mind Map on Absorption and Emission Spectra, created by poppyekoronka on 05/21/2014.

Resource summary

Absorption and Emission Spectra
1 Energy Levels
1.1 An electron in a hydrogen atom can occupy any one of the fixed energy levels
1.2 These different energy levels are the same for all hydrogen atoms.
1.3 In the ground state, the electrons CLOSEST to the nucleus have the lowest energy.
1.4 The difference in the energy levels DECREASES as the electron moves away from the nucleus
2 Absorption Spectra
2.1 An absorption specctra seen on earth is the VISIBLE SPECTRUM OF LIGHT, with black lines corresponding to the absorptions of energy by the electrons
2.2 These spectra are seen from earth when atoms in the chromosphere around stars absorb light
2.3 Electrons absorb a 'photon'
2.3.1 Excited electrons move up to a higher energy level- they are PREMOTED. This is what produces the lines on the Absorption spectrum
2.3.1.1 The EM radiation absorbed by each hydrogen atom has a definite frequency, related to the difference in energy levels by AE=hv
3 Emission Spectra
3.1 Black background with coloured lines on it
3.1.1 These correspond to the emissions of energy by the electrons
3.2 An emission spectrum is seen when a chemical burns with a coloured flame
3.3 Electrons first absorb a 'photon'
3.3.1 Excited electrons move up to a higher energy level- they are premoted
3.3.1.1 Electrons then drop back to lower energy levels. This is what produces the lines on emission spectra
3.3.1.1.1 The E.R emitted by each H atom has a definite frequency related to the difference in energy levels by AE=hv
3.3.1.1.1.1 Since AE is different for each transition, the frequency is different for each transition, and so is the colour of the lines.
4 Similarities
4.1 Both line spectra
4.2 Lines in the same position for each element
4.3 Lines become closer at higher frequencies
4.4 Set of lines representing transitions to a particular level
5 Differences
5.1 Bright lines on black background OR black lines on coloured background
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