The thickness b of very thin film can be determined by the IR interference fringe method. Such interference can be observed between 2800 and 2000 cm-1 region of a polystyrene sheet, which has a refractive index considerably different from that of air. For this reason, significant reflection occurs at the two interfaces of the sheet which are often used to calculate the thickness of the polymer film. Using the 2000-2500 cm-1 region of the provided spectrum we can say that the polystyrene film has a mm thickness of: 100 90 M 80 70 60 50 40 30 20 10 3200 2800 2400 2000 Wavenumber, cm- Seleccione una: O a. 0.030 O b. 0.045 O. 0.090 O d. 0.018 O e. 0.060 Transmittance, %
Carbohydrates
Carbohydrates are the organic compounds that are obtained in foods and living matters in the shape of sugars, cellulose, and starch. The general formula of carbohydrates is Cn(H2O)2. The ratio of H and O present in carbohydrates is identical to water.
Starch
Starch is a polysaccharide carbohydrate that belongs to the category of polysaccharide carbohydrates.
Mutarotation
The rotation of a particular structure of the chiral compound because of the epimerization is called mutarotation. It is the repercussion of the ring chain tautomerism. In terms of glucose, this can be defined as the modification in the equilibrium of the α- and β- glucose anomers upon its dissolution in the solvent water. This process is usually seen in the chemistry of carbohydrates.
L Sugar
A chemical compound that is represented with a molecular formula C6H12O6 is called L-(-) sugar. At the carbon’s 5th position, the hydroxyl group is placed to the compound’s left and therefore the sugar is represented as L(-)-sugar. It is capable of rotating the polarized light’s plane in the direction anticlockwise. L isomers are one of the 2 isomers formed by the configurational stereochemistry of the carbohydrates.
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