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What’s special about benzene?
It is a hexagon It has delocalised electrons It is stable and doesn’t decolourise bromine The Carbon-Carbon bonds are shorter than C-C but longer than C=C
What is meant by an unsaturated fat?
A fat with one or more double bonds between carbon atoms in the aliphatic hydrocarbon chain.
What is a chromophore?
The part of the molecule that absorbs light giving the molecule colour. It is an extended delocalised electron system
List four factors that affect the excitation energy of an inorganic complex
The type of ligand The shape of the complex The coordination number of the complex The charge on the central transition metal ion
List four factors that affect the excitation energy of an inorganic complex
The type of ligand The shape of the complex The coordination number of the complex The charge on the central transition metal ion
Why do compounds appear colourless?
They transmit all visible radiation.
What does a spectrometer measure?
The quantity of light absorbed by the solution at each wavelength.
Draw an ester functional group
(Picture)
What is soap made from?
NaOH + (A fat)
Give the Reagents and conditions need for hydrolysis of a triglyceride (Base catalysed).
Reagents: concentrated NaOH(aq) Conditions: heat
Why are ultraviolet and visible spectra sometimes called electronic spectra?
This radiation is associated with changes in the electronic energy of molecules.
If a solution contained transition metal ions with empty d subshells, what colour would it be?
Colourless
What causes a given substance to appear its colour?
When light energy is absorbed, the amount of energy needed to make electrons jump corresponds to a particular wavelength of light. The rest of the wavelengths are transmitted, giving the colour you see.