CHEMISTRY GLOSSARY

centi    →   centi

Centi is a prefix used in the SI system meaning one hundredth of. For example 1 cm means one hundredth of a meter; 2.3 cg could also be written 2.3×10^-2 g or 0.023 g.

chain    →   lanac

Chain is a linear combination of the same type of atom in a molecule. In straight chain molecules, the atoms are arranged in a line, with each atom in the chain linked to one preceding atom and one succeeding atom of the same type. A closed chain molecule is a chain where the atoms are linked in a ring structure.

atom radius    →   radijus atoma

Atoms and molecules have no strict boundaries. The volume of a free atom is usually defined as that volume that contains 90 % of electron cloud. The radius of an atom represents half of interatom distance of two identical atoms which are in touch but are not interconnected either by a covalent or an ionic bond, but with a very weak van der Waals’s bond.

automatic burette    →   automatska bireta

Automatic burette is used for series of tests. It is connected with a bottle which contains the titration solution. The air is pumped into the bottle by a small rubber air pump, created the pressure in the bottle which the rises the solution to the top of burette. When the the burette is full, the valve is released, the pressure in the bottle falls and the burette automatically sets itself to zero. Work with automatic burettes is by far faster and the consumption of standard solution is smaller.

bag filter    →   vrećasti filtar

Bag filter is a unit within a mechanical system that bellows in a bag form when air flows through, cleaning the air by collecting particles of foreign matter. This system of filtering is rated the most efficient- in a range of 92 % to 95 %. Vacuum cleaner have a cloth filter bag.

Bag filter system is an economical method of liquid filtration consisting of the pressure vessel, restrainer basket and micron rated filter bag. Liquid flow is from the inside to the outside of the bag - dirt is trapped inside the bag.

chalcogens    →   halkogeni elementi

Chalcogens are the Group 16 elements: oxygen (O), sulphur (S), selenium Se), tellurium (Te), and polonium (Po). Compounds of these elements are called chalcogenides.

chemical    →   kemikalija

Chemicals are a common name for all chemical products or substances prepared by means of chemical-technologic processes.

chemical element    →   kemijski element

Chemical element is a type of matter of which elementary matter is composed. Chemical element is composed of atoms with the same core charge.

chemical energy    →   kemijska energija

Chemical energy is the energy stored in substances and transferred during chemical reaction.

chemical property    →   kemijsko svojstvo

Chemical property is a property observed when a substance undergoes a transformation into one or more new substances. Measurement of a chemical property involves a chemical change. For example, determining the flammability of petrol involves burning it, producing carbon dioxide and water.