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16 Cards in this Set
- Front
- Back
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Avagadros number |
L = 6.02 x10^23 mol l^-1 |
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Planks constants |
h= 6.63 x10^-34 Js |
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Engery in 1 mole of radiation in form of photons |
E= Lhc/λ |
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Speed of light/ c |
3 x10^8 |
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Relationship between frequency and wavenlength |
c= fλ |
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Units of frequency |
Hertz (Hz) , ms^-1 |
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Units of wavelength |
nm (meters x10^-9) |
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Energy emitted by a photon/ a molr of photons |
ΔE= hf , ΔE= Lhf |
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Dual nature of electronmagnetic radiation |
It is a wave but still exhibits particle like behaviour |
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How to determine E in kJmol l^-1 |
E=Lhf/1000 , E=Lhc/1000λ |
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What happens when energy is transfered to atoms |
Electrons within the atom may be promoted to hugger energy levels |
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What happens when electrons return to their original energy levels |
Energy must be lost from the atom and the energy is released in thr form of a photon |
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How can the quantity of elements present in a sample be calculated |
Using their atomic emission spectroscopy and atomic absorption spectroscopy |
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How can the absoption spectrum be produced |
By measuribg how a samples transmission of light varies with wavelength |
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What are high temperatures used for in emission spectroscopy |
To excite the electrons within atoms and as the electrons drop to lower energy levels, photons are emitted |
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In atomic spectroscopy how is thr concentration of an element with a sample calculated |
By measuring the intensitt of light emitted or absorbed |
