Chemistry of colour

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  • Created by: J.E.C.
  • Created on: 29-04-14 16:38
Coloured compounds absorb radiation in the __ __ of the spectrum?
Vicible region
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When radiation is absorbed, electrons are __ from the __ state to an ___ state?
EPromoted, ground, excited
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The excited electrons are the __ ones?
Outermost
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Some require greater energy, corresponding to __ radiation being absorbed and the substance would appear __?
UV, colourless
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The chromophore is...?
An extended delocalised electron system
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Electrons in double bonds are more __ __ so require __ energy to excite, this is why they abrob on the visible region?
Spread out, less
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What is commonly attached to the chromophore to enhance of modify the colour? These contain __ __ that become involved in the __ __ __? This changes the __ of light absorbed and therefore the __?
Functional groups. Lone pairs, delocalised electron systems. Energy, colour.
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Coloured inorganic compounds often contain __ __. Orbitals close to the ligand are pushed to...? As a result the 5 d orbitals are split into..?
Transition metals. Slightly higher energy levels. Two groups at different energy levels.
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The colour we see is white light minus...?
The frequencies of absorbed light.
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The energy needed to excite a d electron also depends on the __ __?
Oxidation state.
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What is electron transfer?
Transfer of an electron from the ground state of one atom to the excited state of another adjacent atom. Responsible for very bright pigments.
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Other cards in this set

Card 2

Front

When radiation is absorbed, electrons are __ from the __ state to an ___ state?

Back

EPromoted, ground, excited

Card 3

Front

The excited electrons are the __ ones?

Back

Preview of the front of card 3

Card 4

Front

Some require greater energy, corresponding to __ radiation being absorbed and the substance would appear __?

Back

Preview of the front of card 4

Card 5

Front

The chromophore is...?

Back

Preview of the front of card 5
View more cards

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