Instrumental Analysis an der Hochschule Bonn-Rhein-Sieg | Karteikarten & Zusammenfassungen

Lernmaterialien für Instrumental Analysis an der Hochschule Bonn-Rhein-Sieg

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TESTE DEIN WISSEN
On a molecular level, what happens to a molecule that absorbs ultraviolet or visible light?
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TESTE DEIN WISSEN
The energy of UV/VIS light is large enough to promote the transition of valence electrons to higher energy levels. Hence, the molecule reaches an excited electronic state for a short time interval,
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TESTE DEIN WISSEN
How can you increase the accuracy of a DAD?
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TESTE DEIN WISSEN
By increasing the number of diodes
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TESTE DEIN WISSEN
Which colours can molecules have for absorptions below 400 nm?
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TESTE DEIN WISSEN
Molecules which only absorb UV light are colourless. Only molecules which absorb VIS light show colour.
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TESTE DEIN WISSEN
Which valence electrons are considered σ-electrons?
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TESTE DEIN WISSEN
single bonds
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TESTE DEIN WISSEN
Why does UV/VIS spectroscopy not work for wavelenghts below 200 nm?
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TESTE DEIN WISSEN
Below 200 nm (mostly starting at 190 nm), the UV absorption of oxygen becomes significant and interferes with the measurement.
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TESTE DEIN WISSEN
What are the three types of valence electrons?
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TESTE DEIN WISSEN
σ-electrons, π-electrons and n-electrons
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TESTE DEIN WISSEN
What is the working range of UV/VIS spectroscopy?
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TESTE DEIN WISSEN
200 - 800 nm
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TESTE DEIN WISSEN
Which wavelenghts give UV-A light?
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TESTE DEIN WISSEN
320 - 400 nm
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TESTE DEIN WISSEN
Which wavelenghts give UV-A light?
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TESTE DEIN WISSEN
320 - 400 nm
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TESTE DEIN WISSEN
Which wavelenghts give VIS light?
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TESTE DEIN WISSEN
400 - 800 nm
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TESTE DEIN WISSEN
"The ... the wavelenght of light, the higher its energy."
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TESTE DEIN WISSEN
shorter
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TESTE DEIN WISSEN
What colour do coloured compounds show after absorption of VIS light?
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TESTE DEIN WISSEN
They appear in the complementary colour. If the light of two complementary colours is mixed, white results, if one is taken away, the other is shown. Example: A substance is irritiated with white light. This compound absorbs red light at 700 nm. All other colours of white light are reflected. The reflected colour is green because the complementary colour red is missing.
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Q:
On a molecular level, what happens to a molecule that absorbs ultraviolet or visible light?
A:
The energy of UV/VIS light is large enough to promote the transition of valence electrons to higher energy levels. Hence, the molecule reaches an excited electronic state for a short time interval,
Q:
How can you increase the accuracy of a DAD?
A:
By increasing the number of diodes
Q:
Which colours can molecules have for absorptions below 400 nm?
A:
Molecules which only absorb UV light are colourless. Only molecules which absorb VIS light show colour.
Q:
Which valence electrons are considered σ-electrons?
A:
single bonds
Q:
Why does UV/VIS spectroscopy not work for wavelenghts below 200 nm?
A:
Below 200 nm (mostly starting at 190 nm), the UV absorption of oxygen becomes significant and interferes with the measurement.
Mehr Karteikarten anzeigen
Q:
What are the three types of valence electrons?
A:
σ-electrons, π-electrons and n-electrons
Q:
What is the working range of UV/VIS spectroscopy?
A:
200 - 800 nm
Q:
Which wavelenghts give UV-A light?
A:
320 - 400 nm
Q:
Which wavelenghts give UV-A light?
A:
320 - 400 nm
Q:
Which wavelenghts give VIS light?
A:
400 - 800 nm
Q:
"The ... the wavelenght of light, the higher its energy."
A:
shorter
Q:
What colour do coloured compounds show after absorption of VIS light?
A:
They appear in the complementary colour. If the light of two complementary colours is mixed, white results, if one is taken away, the other is shown. Example: A substance is irritiated with white light. This compound absorbs red light at 700 nm. All other colours of white light are reflected. The reflected colour is green because the complementary colour red is missing.
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