class 11 chemistry notes

Write a note on the Covalent bond?

Write a note on the Covalent bond? ANSWER: COVALENT BOND: INTRODUCTION: G.N Lewis proposed that atoms could attain stable electronic configuration by sharing electrons between them. Covalent Bond Definition:  The bond which is formed by the mutual sharing of electrons is called a covalent bond.  REPRESENTATION OF COVALENT BOND: The shared pair of electrons are …

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Explain the two concepts, which explain the chemical bonding?

Explain the two concepts, which explain the chemical bonding? ANSWER:    Chemical bonding is explained with the help of two important concepts. The Valence Concept The Orbital Concept The Valence Concept (Electric theory of valence) INTRODUCTION:       In 1916, G.N Lewis and W. Kossel presented the electronic theory of valence. STATEMENT:  It states that “In a …

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Gas Discharge Tube Experiment | Discovery of Cathode rays

Discharge tube Experiment (William Crooks Experiment) (Discovery of Electrons / Cathode rays)  Gases are bad conductors of electricity but it is observed that at low pressure they conduct electricity. For this William purpose Crooks developed a discharge tube or cathode ray tube. The gas discharge tube consists of : 1. Cylindrical glass tube 2. Two …

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Planck’s Quantum Theory of Radiation| Black body radiation

Planck’s Quantum Theory of Radiation: In 1900, a German Physicist Max Planck had studied radiations emitted by hot black bodies and presented the results of his famous black body radiations experiments, which showed that light has a dual character, behaving like a particle as well as a wave. He gave the quantum theory of radiation …

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Charle’s Law – Gas Law Chemistry Notes

Charle’s Law: Jacques Charles, in 1662, gave this law. It relates the volume and absolute temperature of ideal gases at constant pressure and mass. It states “For a fixed mass of a gas, the volume is directly proportional to absolute temperature at constant pressure.” V         ∝        T          …………….. (1) This shows that when absolute temperature …

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What are the Defects of Bohr’s Atomic Model?

What are the Defects of Bohr’s Atomic Model? In 1913 Neil Bohr’s presented a new model for an atom, known as Bohr’s atomic model. It has the following defects: 1. Spectrum of poly electrons atoms:  Bohr’s atomic model cannot explain the spectrum of complicated (poly electrons) atoms. It only explains the spectrum of H-atom and …

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Bohrs atomic model

Bohr’s Atomic Model ( Main Postulates) – Chemistry Notes

Bohr’s Atomic Model: (Bohr’s atomic model for hydrogen atom) Neils Bohr’s, 1913 proposed a model of an atom based on the planks quantum theory of radiation. Main Postulates of Bohr’s theory: The basic postulates of Bohr’s theory are: An atom consists of small, heavily positively charged nucleus around which electrons revolve in definite circular paths …

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Boyle’s Law | Gas Law – State of matter Gases

Boyle’s Law: Robert Boyle, in 1662, gave this law. It relates the pressure and volume of ideal gases at constant temperature and mass. It states “For a fixed mass of a gas, the volume is inversely proportional to the pressure at a constant temperature.”     Thus law can also be stated as: “For a fixed mass …

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Valence Concept and Orbital Concept – Concepts of chemical bonding

Explain the two concepts, which explain the chemical bonding?ANSWER:There are two concepts, which explain chemical bonding.A. The Valence ConceptB. The Orbital ConceptThe Valence Concept (Electric theory of valence) INTRODUCTION:G.N Lewis and W. Kossel in 1916, gave the electronic theory of valence. The Valence Concept: STATEMENT:It states that,“In the formation of a chemical bond, atoms take …

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