CHEMISTRY GLOSSARY

immersion plating    →   galvaniziranje uranjanjem

Immersion plating involves depositing a metallic coating on a metal immersed in a liquid solution, without the aid of an external electric current. Also called dip plating.

erbium    →   erbij

Erbium was discovered by Carl Gustaf Mosander (Sweden) in 1843. Named after Ytterby, a village in Sweden. It is soft, malleable, silvery metal. Reacts slowly with water. Dissolves in acids. Metal ignites and burns readily. Erbium is found with other heavier rare earths in xenotime and euxenite. Erbium oxide is used in ceramics to obtain a pink glaze. Also a few uses in the nuclear industry and as an alloying agent for other exotic metals.

Erlenmeyer flask    →   Erlenmeyerova tikvica

Erlenmeyer flask is a glass container which has a narrow, cylindrical mouth and a cone-shaped main body that ends in a wide, flat bottom. It was named after its inventor, a German chemist Richard Erlenmeyer (1825-1909). Erlenmeyer flasks are most often used in titrations to hold the liquid that is being titrated.

ester    →   ester

Esters are organic compounds formed by a reaction between alcohol and acids. Esters formed from carboxylic acids have the general formula RCOOR’. Triesters, molecules containing three ester groups, occur in nature as oils and fats.

ether    →   eter

Ethers are organic compounds with a formula R-O-R, where R is not equal to H. They may be derived from alcohols by elimination of water, but the major method is catalytic hydration of olefins. They are volatile highly flammable compounds; when containing peroxides they can detonate on heating. The term ether is often used synonymously with diethyl ether.

impedance    →   impedancija

Impedance is the analogue of the resistance or resistivity when applied to alternating current. That is, it is a measure of a material’s inability to carry the electrical current. In many materials the impedance varies as the frequency of the applied electrical potential changes, due to the properties of the conducting liquid or solid. In electrochemistry, the impedance of the electrodes is also frequency dependent.

infrared spectroscopy    →   infracrvena spektroskopija

Infrared (IR) spectroscopy is a technique used for determining the structure (and sometimes concentration) of molecules by observing how infrared radiation is absorbed by a sample.

insulator    →   izolator

Insulator is a material in which the highest occupied energy band (valence band) is completely filled with electrons, while the next higher band (conduction band) is empty. Solids with an energy gap of 5 eV or more are generally considered as insulators at room temperature. Their conductivity is less than 10^-6 S/m and increases with temperature.

intermediate    →   intermedijer

Intermediate is a molecular or ionic species that is formed (directly or indirectly) from the reactants and reacts further (directly or indirectly) to form the products of the reaction. It does not accumulate during the course of the reaction.

Euler number    →   Eulerova značajka

Euler number (Eu) is a dimensionless quantity used in fluid mechanics, defined by

where p is pressure, ρ is density, and v is velocity.