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Basics evaluating the rate of a chemical reaction Experimental determination of reaction rates depends upon the nature of reaction under investigation. Rates, can be conveniently studied by measuring the suitable physical property of the system as a whole or one of the constituent of the reaction. Transformation and diversities of elementary particles We are familiar with many chemical changes occurring around us. In such changes, substances are undergoing permanent changes and new substances are formed. When different substances react and new substances having different nature and identity are formed, we say a chemical reaction has occurred. Prominent properties of surface chemistry There are many properties of matter which are related to their surface. These surface properties become prominent when the material is present in finely divided form or if its surface is rough. Under these conditions, surface area of the material increases enormously and large amount of the substance is present at the surface. Clathrate caged compounds in crystal lattice structures The stable electronic configuration of the noble gases probably restricted the attempts to prepare chemical compounds of the elements. Every attempt to prepare inert gas compounds of the usual types by treatment with oxidizing or reducing agents has met with failure. The contaminated Carbon The combustion of coal and hydrocarbons produce a mixture of carbon dioxide, carbon monoxide, sulphur dioxide, oxides of nitrogen and unburnt hydrocarbons. Though combustion of fuels is helping us in many ways, yet combustion of fuels is one of the major causes of pollution in atmosphere in our cities and towns. Non sticking brown colored hydrate Corrosion is a matter of common observation that certain metals are slowly eaten up on long exposure to atmosphere. For example: silver gets tarnished, copper develops green coating on its surface, iron gets rusted and lead loses its luster.

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