Assign the irreducible representation $($symmetry label$)$ of the

u $3$ normal mode of water shown on the right. Identify the IR and Raman activity of this normal mode. Relate the IR and Raman activity of the normal modes of water to the choice you might make to investigate a water loaded polymer hydrogel sample using vibrational spectroscopy $v_3(3756c{m}^{-1}).$ Q$2.$Using infrared spectroscopy slect an appropriate technique to a$.$ Identify which of two activated carbon samples has the higher degree of surface oxidation in the form of carboxylic acid on their surfaces.

b$.$ The structure of a polymer laminate material with a $1\mathrm{.}5$ micron layer of Teflon over a $10$ micron nylon substrate must be confirmed.