CHEMISTRY GLOSSARY
polar molecule → polarna molekula
Polar molecules are molecules at which centres of gravity of positive and negative charge are not in the same point.
polarimeter → polarimetar
Polarimeter is an appliance which measures the angle of turning of polarisation light.
polarimetry → polarimetrija
Polarimetry measures the overall turning of the flat of polarised light. It is used when analysing optically active substances and compounds.
polarogram → polarogram
Polarogram is a graph of current versus potential in a polarographic analysis. The position of a polarographic wave in a polarogram along the x axis (E1/2) provides an identity of the substance while the magnitude of the limiting diffusion current (id) provides the concentration of this substance.
polarography → polarografija
Polarography is a volumetric technique which is based on a diffusion controlled analyte travel to the surface of dropping mercury electrode (DME). The surface of the working electrode (dropping mercury electrode) is constantly renewed under dropping conditions and, thus, the conditions under which reaction takes place are readily reproducible. Depolarisation potential enables identification of ions present in the solution, and by measuring the diffusion current their concentration is calculated. Polarography was discovered in 1922 by the Czech chemist Jaroslav Heyrovský (1890-1967).
polychlorinated biphenyls → poliklorirani bifenili
Polychlorinated biphenyls (PCB) are poisonous and carcinogenic compounds. They are pollutants of both live and inanimate environment, and they are used as insulation and refrigerating materials in transformers and condensers.
polydentant ligand → polidentantni liganad
Polydentant ligands contain more co-ordination points (can give more electron pairs) and they form complex ringlike structures (celate complexes) by replacing two or more monodentant ligands. That kind of ligand is EDTA which has 6 co-ordinational points and with metals it creates complexes, always in 1:1 ratio.
polymer → polimer
Polymer is a substance composed of molecules of high relative molecular mass (molecular weight), the structure of which essentially comprises the multiple repetition of units derived, actually or conceptually, from molecules of low relative molecular mass (monomers). In most cases the number of monomers is quite large and is often not precisely known. A single molecule of a polymer is called a macromolecule. Polystyrene is light solid material obtained by polymerisation of styrene (vinyl benzene).
polymerization → polimerizacija
Polymerization is a reaction of connecting many monomers in one long molecule whereby polymers are created.
Citing this page:
Generalic, Eni. "Curtain rod width." Croatian-English Chemistry Dictionary & Glossary. 29 June 2022. KTF-Split. {Date of access}. <https://glossary.periodni.com>.
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