in chemistry and physics, as well as a number of other sciences are different terms for a particular system.This is necessary for entering into the necessary classification and facilitate the study of specific processes.Heterogeneous systems in the literal sense of disparate, even though they consist of homogeneous parts.In this regard, there are a number of features that may impede understanding of these processes.
As we know, matter can exist in different states.And between these states is a very significant difference, which eventually even affect the properties.
most common heterogeneous systems - a liquid that can go into a saturated solution or steam, many alloys, etc.There are two basic states of matter - crystalline and amorphous.They largely determine certain physical, thermodynamic and other properties.
In heterogeneous systems there are all sorts of gaps in the continuity of physical properties.Scientists call their interface, which is usually quite easy to identify.When conditions change, these sections can also be displaced in one direction or another, which ultimately leads to changes in all properties.The equilibrium in heterogeneous systems is very important if you want to maintain the same state throughout the reaction or experiment.
Heterogeneous reactions
Speaking of such systems, not to mention those areas of work where they are applied.Heterogeneous reactions - a reaction occurring in heterogeneous systems, ieit involves substances in different phases.This is a full-heterogeneous systems.
example of the reaction can be dissolved metals in acids, the decomposition of salts to form solid and gaseous products and others.Also included are some catalytic reactions which occur on the catalyst surface.The main feature of such heterogeneous catalytic reactions is that the reactant and the product isolated can be in different states.
phase difference generally difficult to work with these reactions is complicated because the transport of substances, mixing and diffusion, and the activation of molecules can begin at the stage hit the surface of the section.For
reaction need constant replenishment of the reagents and removing of the products formed in a chemical process.This reaction kinetics or the flow rate is determined by the specific substances, the speed of the chemical reaction and the properties, which have a heterogeneous system.If any trouble does not arise, and the diffusion of substances maintained in the normal state, the reaction rate is proportional to the size of the zone.This is called the specific rate of the reaction.In this case, the concentration is considered, the conditions of the reaction, the partial pressure and so on.The ratio of the thermodynamic activity derived products and raw materials determines the equilibrium constant of the heterogeneous system.
This constant need to calculate almost any reactions in heterogeneous systems.With its help you can accurately determine the amount of raw materials needed for a full chemical reaction, and can calculate the exact yield of the products.When operating with such data can be easily controlled reaction, in addition, it is always possible to control the direction of the reaction.In this regard, we can say that the equilibrium constant is very important for reactions in heterogeneous systems.
