HL Paper 3
The structures of morphine, diamorphine and codeine are given in section 37 of the data booklet.
Methadone is used to treat heroin addiction. 1H NMR spectroscopy can be used to study its structure.
Predict the number of different hydrogen environments in the molecule ignoring the benzene rings.
Predict the chemical shift and the splitting pattern seen for the hydrogens on the carbon atom circled in the diagram. Use section 27 of the data booklet.
Ethanol can be detected by a variety of instruments.
Fuel cells use an electrochemical process to determine the concentration of ethanol.
Formulate the overall equation for this process.
Predict the chemical shifts and integration for each signal in the 1H NMR spectrum for ethanol using section 27 of the data booklet.
X-ray crystallography of a metal crystal produces a diffraction pattern of bright spots.
Using X-rays of wavelength 1.54 × 10−10 m, the first bright spots were produced at an angle θ of 22.3° from the centre.
Calculate the separation between planes of atoms in the lattice, in meters, using section 1 of the data booklet.