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copyright © 2018   : Subhas Stores
Author      : K K Padmanabha
Publisher      : Subhas Stores
Chapters/Pages      : 8/252
Total Price      : Rs.      : 146
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Mathematical Concepts Total views (4)  
Logarithms are extensively used in the absence of computers and calculators. The operations of multiplication and division are replaced by addition and subtraction and those of raising power and extracting a root by multiplication. John Napier (1550 1617) introduced the concept of logarithms and Henry Brigg (1556 1631) modified them. The present-day notion of logarithms comes from Leonhard ......
Pages: 29
Price: Rs 0   
Gaseous State Total views (2)  
Gas is one state of matter. It has neither shape nor volume and has very much weaker molecular forces of attractions. The gaseous behaviour is more uniform and simple to understand. As gases are invisible, they are described through the use of four physical properties or macroscopic characteristics: pressure, volume, number of particles (moles) and temperature. These four characteristics were ......
Pages: 22
Price: Rs 14.3   
Photo Chemistry Total views (0)  
Ordinary reactions are initiated by activation due to molecular collisions. The average kinetic energy of translational motion (4.184 kJmol-1) is not sufficient to brought about chemical transformation, which requires about 40 - 60 kJmol-1of energy. Another way to provide activation is to bring the molecule to collide with photons of UV light, X-rays, or 􀁊-rays. Thus photochemistry de ......
Pages: 23
Price: Rs 14.95   
Liquid Mixtures Total views (0)  
Liquids exhibit various properties like viscosity, surface tension, refractive index etc. Few of them are discussed below.
Pages: 64
Price: Rs 41.6   
Periodic Table and Properties Total views (0)  
The elements are arranged in the form of table called periodic table. In 1789, Antoine Lavoisier identified a list of 33 chemical elements, grouping them into gases, metals, nonmetals, and earths. In 1817, Johann Wolfgang Dbereiner began to formulate one of the earliest attempts to classify the elements. In 1828 he found that some elements formed groups of three with related properties. He te ......
Pages: 32
Price: Rs 20.8   
Analytical Chemistry Total views (0)  
Accuracy and precision are very important in chemistry. However, the laboratory equipment and machines used in laboratory are limited in such a way that they can only determine a certain amount of data. For example, a scale can only weigh the mass of an object until a certain decimal place, because no machine is advanced enough to determine an infinite amount of digits. Machines are only able ......
Pages: 23
Price: Rs 14.95   
Electronic Effects and Reactive Intermediates Total views (1)  
During the chemical reaction, old bonds are broken down and new bonds are formed. Breaking and making of bonds is called chemical reaction. Eg: CH3COOH + CH3OH 􀁯 CH3COOCH3 +H2O In acetic acid the bond between CO is broken. In methyl alcohol the bond between O H is broken. In methyl acetate the bond between CO is formed. In water bond between HO is formed.
Pages: 18
Price: Rs 11.7   
Aliphatic Hydrocarbons Total views (0)  
Alkanes are saturated hydrocarbons containing CC bonds. They are represented by the general formula CnH2n+2 where n is the number of carbon atoms. n=1 CH4 methane, n=2 C2H6 ethane, n=4 C4H10 butane, etc. In alkanes carbon atoms are sp3 hybridised. Hence alkanes are Tetrahedral in nature. As they contain only single bonds, they are inert towards most of the chemical reagents. Hence they are a ......
Pages: 41
Price: Rs 26.65   

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