chemistry

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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Rutherford’s Atomic Model (Gold Foil Experiment) – Chemistry Notes

Rutherford’s Atomic Model Rutherford,1911 performed an experiment in order to find the arrangement of electrons and protons in an atom. Rutherford’s Gold Foil Experiment Rutherford bombarded a very thin gold foil about 0.00004 cm thickness with alpha particles. Alpha particles were obtained from the disintegration of polonium. Alpha particles are helium nuclei. i.e. He ++ …

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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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Why do atoms form chemical bonds? – Chemistry Notes

  Why do atoms form chemical bonds?                             OR Why most atoms are chemically bonded to other atoms in nature? ANSWER: Chemical bond:  The attractive force which holds the atoms together to form a compound or molecule is called a Chemical bond. REASONS:  Every system in the universe tends to lower its energy, in order …

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What is a Chemical bond | Chemistry Notes

What is a chemical bond?                OR Identify and define the four major types of chemical bonding? Answer: Chemical Bond The attractive forces that hold the atom together to form a chemical compound or molecule are called chemical bonds. EXPLANATION: Why do atoms form chemical bonds? The chemical reactivity of free elements other than inert …

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Main Principles of Kinetic Molecular Theory of Gases – States of matter Gases Chemistry

Kinetic Molecular Theory of Gases: The kinetic molecular theory of gases explains the physical behaviour of gases. Main Principles of Kinetic Theory of Gases: It has the following main principles or postulates. All gases consist of molecules which are widely separated from each other. Space occupied by gas molecules is negligible as compared to space …

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