SS 2 Chemistry (1st Term)

Chemistry

ELECTROCHEMISTRY

It is a well known fact that energy menifests itself in different forms which are interconvertible into one another. Among different forms of energy, the electrical energy plays a very significant role in our daily life. Many chemical transformations and industrial processes are based on electrical energy and its relationship with chemical energy. There are

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Chemistry

ELECTROLYTIC CELLS AND ELECTROLYSIS OF SPECIFIED ELECTROLYTES

The passage of electricity through the electrolytes in their molten or dissolved state can cause chemical changes under suitable conditions. For example, the passage of electricity through the acidified water results in the formation of hydrogen and oxygen gases. The process of chemical decomposition of the electrolyte by he passage of electricity through its molten

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Chemistry

Electrolysis

When an electric current is passed through an electrolyte solution, the ions of the electrolyte undergo chemical changes at the respective electrodes. The chemical reaction carried out by passing electricity is called electrolysis. it is important that we familiarize ourselves with different terms that we are going to use to explain different phenomena. It is

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Chemistry

IONIC THEORY

IONIC THEORY To account for the phenomena of electrolysis the Ionic Theory was put forward by Arrhenius in 1880. The theory states that electrolytes are made up of ions, which are built up in certain patterns called crystal lattice. When these substances dissolve in water, the structure is destroyed and the ions are set free

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Chemistry

BALANCING OF REDOX REACTIONS

Balancing by Ion Electron or Half Reaction Method We are familiar with the balancing of chemical equations by inspection method. However, inspection method may not be useful for balancing the redox equations because in these equations, we have to keep in mind the conservation of charge as well as conservation of mass. The redox equations,

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Government (Secondary School)

Concept of Oxidation and Reduction

Classical Concept of Oxidation and Reduction In our daily life we come across processes like rusting of iron articles, fading of the colour of the clothes, burning of the combustible substances such as cooking gas, wood, coal, etc. All these processes fall in the category of redox reactions. A large number’ of industrial processes like,

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Chemistry

PERIODIC TRENDS IN PHYSICAL PROPERTIES

Most of the properties of the elements such as atomic volume, atomic size, ionization enthalpy, electron affinity and electronegativity are directly related to the electronic configuration of the atoms. These properties undergo periodic variation with the change in the atomic number within a period or a group. These properties indirectly control the physical properties such

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Chemistry

PERIODICITY

THE NEED FOR CLASSIFICATION OF ELEMENTS Before the beginning of eighteenth century, only a very few elements were known and it was quite easy to study and remember their individual properties. In 1800, only 31 elements were known. This number of elements grew to 63 by 1865. With the discovery of large number of elements

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