1 CD(a) how some dyes attach Three colours from the same dyebath themselves to fibres in terms of (Nuffield foundation) intermolecular bonds, ionic bonds and In this practical learners dip various covalent bonding materials into a dyebath containing three dyes. Different materials pick up different dyes and thus emerge different colours. The different interactions between dyes and materials are caused by different intermolecular bonds. THINKING CONTEXTUALLY CD(b) the structure of a dye molecule William H Perkin: Founder of the Dye in terms of the chromophore and: Industry (Colorantshistory) (i) functional groups that modify the A biography of William Perkin and his chromophore pioneering use of aromatic chemistry (ii) functional groups that affect the reactions to develop the first dyestuffs solubility of the dye when only seventeen years old! (iii) functional groups that the dye to bond to fibres THINKING CONTEXTUALLY CD(c) fats and oils consist mainly of Using UV activated beads to determine mixed esters of propane-1,2,3-triol with activation enthalpy (National Stem varying degrees of unsaturation Centre) UV activated beads of various colours can be purchased cheaply and used not only to discuss the changes that occur in the UV active dye’s structure, allowing absorption to occur in the visible, but also in a rate of reaction context. This practical could be adapted to explore a variety of parameters.
1 CD(a) how some dyes attach themselves to fibres in terms of intermolecular bonds, ionic bonds and covalent bonding Three colours from the same dyebath (Nuffield foundation) In this practical learners dip various materials into a dyebath containing three dyes. Different materials pick up different dyes and thus emerge different colours. The different interactions between dyes and materials are caused by different intermolecular bonds. THINKING CONTEXTUALLY CD(b) the structure of a dye molecule in terms of the chromophore and: (i) functional groups that modify the chromophore (ii) functional groups that affect the solubility of the dye (iii) functional groups that the dye to bond to fibres William H Perkin: Founder of the Dye Industry (Colorantshistory) A biography of William Perkin and his pioneering use of aromatic chemistry reactions to develop the first dyestuffs when only seventeen years old! THINKING CONTEXTUALLY CD(c) fats and oils consist mainly of mixed esters of propane-1,2,3-triol with varying degrees of unsaturation Using UV activated beads to determine activation enthalpy (National Stem Centre) UV activated beads of various colours can be purchased cheaply and used not only to discuss the changes that occur in the UV active dye’s structure, allowing absorption to occur in the visible, but also in a rate of reaction context. This practical could be adapted to explore a variety of parameters.