NATS 1870 Lecture 12: SC NATS 1870 LECTURE 12
12 Aug 2016
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Chemistry and colour continuation: example of colour change indicating chemical change, bleach: Red colour disappears but dye molecules have not been taken out. Bleach molecules can do one of two things: break apart the dye molecule entirely ex: bleaches with chlorine (chlorine is very reactive atom) Dye molecule contains covalent double bond: chromaphore = electron pair which absorbs b, g wavelengths. With bleach- that double bond gets broken + dye molecule goes into fragments. B, g no longer selectively absorbed- red colour disappears: dye molecule"s structure can be modi ed by bleach molecule. Changes through a chemical reaction-> the double bonds in dye molecule to single bonds. Chemicals produced in a natural gas burning (like benzene c6h6 its a ring structure with 6 sides and hydrogen on the outsides of it) !1: 1856: perkins trying to cure malaria- synthesize quinine . Failed - instead perkins managed to synthesize 1st mass-produced synthethic dye mauvine .
