Chemical reactions

CHHATTISGARH   C’garh only state to distribute rs 700 cr bonus to tendupatta collectors’   Chief Minister Raman Singh inaugurated and performed bhumi-pujan of 21 development works worth nearly Rs 100 crore in the public meeting held at playground of Government Higher Secondary School Hringirishi in the district.   This includes extension work of 22-km long Nagri distributary of Sondhur canal till Dugli and renewal work of 61-km long road from Dhamtari to Nagri worth Rs 60.53 crore.   The Chief Minister said that he had sanctioned canal related demand of people during Lok Suraaj campaign, and now he is ... Read more

The Rate of a Chemical Reaction The rate of a chemical reaction can be defined as the amount of the reaction which occurs in unit time. The rate of a reaction is measured by choosing certain properties of the reaction which will indicate how far the reaction has gone, and whose magnitude can be observed with time without disturbing the reaction. For example, a reaction which shows color change: the rate of such reaction can be measured by observing how the intensity of color formed changes with time. In a similar way, a reaction which involves gases can have its ... Read more

Corrosion is defined as an attack on a material as a result of chemical, frequently electrochemical reaction, with the surrounding medium. According to this definition, the term corrosion can be applied to all materials, including non-metals. But in practice, the word corrosion is mainly used in conjunction with metallic materials. Why do metals corrode? Apart from gold, platinum and a few others, metals do not occur in the nature in their pure form. They are normally chemically bound to other substances in ores, such as sulphides, oxides, etc. Energy must be expended (e.g. in a blast furnace) to extract the ... Read more

Endothermic Reactions Endothermic reactions are those chemical reactions where energy is absorbed by the system from the surroundings mostly in the form of heat. The concept is applied in the physical sciences like chemical reactions where hear is converted to chemical bond energy by way of experiments. Common examples of endothermic reactions are cooking an egg, photosynthesis, and evaporation. This reactions process accounts for the enthalpy change of a reaction only. The overall energy analysis of any reaction is the Gibbs free energy that includes temperature and entropy in addition to the enthalpy. The point to mention here is that ... Read more

Slow reactions   Chemical reactions that occur very slowly and can take a long time for completion are called slow reactions. Usually covalent compounds are involved in slow reactions. Some reactions can take days, weeks and months to complete; they are called very slow reactions. For example, Milk may take several hours or a day to convert to curd, while it may take even longer for iron to corrode. Rusting of Iron 4Fe + 3O2       ->    2Fe2O3 (Iron) (Oxygen)      (Rust – Iron Oxide) Formation of crude oil by a geochemical reaction and disintegration of radium are other examples of ... Read more