FIITJEE Chemistry

  Auroras Introduction: •        An Aurora is a natural light display seen in the earth's sky, usually found in the high latitude (arctic and antarctic). •        Auroras are a result of disturbances in the magnetosphere caused by solar winds. •        These disturbances are sometimes strong enough to alter the trajectories of charged particles in both solar wind and magnetospheric plasma. Colors of Auroras (We recommend seeing the presentation for more clearance below) Auroras can be of a variety of colors: •        Red: at very high altitudes •        Green: at lower altitudes •        Blue: at very low altitudes •        Yellow •        Pink •        Ultraviolet: found in mars,...

  COLLOIDS   SOME IMPORTANT TERMS: - I) HOMOGENEOUS AND HETEROGENEOUS MIXTURES: - A mixture that has a uniform composition throughout its mass, with no unique features that are visible in between the particles are called homogeneous mixtures. The exact opposite case is for heterogeneous mixtures. HOMOGENEOUS--> Solutions HETEROGENEOUS--> Colloids & Suspensions   SOLUTE, SOLVENT, AND SOLUTION: -          I)  SOLUTION: - A Homogeneous Mixture containing two or more solids, liquids, and gases. Eg:- Sugar solution        ii)     SOLUTE: - The component that is present in a lesser amount in a solution is called a    solute. Eg: In the Sugar solution, Sugar is the solute as its present in a lesser amount.      iii)    SOLVENT: - The component that is present in a larger amount in a solution is called a solvent. ...

  The Planets Introduction •       The solar system contains many planets, each of them being unique and having distinct features. •       In this presentation, I am going to discuss: §   The different types of planets. §   The composition of the planets §   A brief description of the composition of ceres. Types of planets: •       Based on their composition, planets are mainly divided into two types; gas giants and terrestrial planets. i)                   Gas Giants: •       Gas giants are composed of a high percentage of solid material. Due to the extreme pressure that exists within the core of a gas giant, hydrogen may be converted into a metallic solid or liquid form. Frequently, there are other materials interspersed within this solid matrix as well....

  Atomic Structure  INTRODUCTION The matter is anything that occupies space and has mass The matter is made up of small tiny particles which were recognized early by man. Dalton, an English Scientist, proposed that matter is made up of tiny particles. He termed these particles as ATOMS - indivisible.                 scroll down the See the presentation/ppt (science) Dalton's Atomic theory: Postulates of Dalton Atomic theory The matter is made up of extremely small particles called atoms Atom are indivisible particles, which can be neither be created nor destroyed Atoms of a given element are identical in all respects of mass, shape, size and chemical reactions Atoms of different elements have different masses and chemical properties Atoms combine in a ratio of small whole numbers to form compounds The relative number and kinds of atoms are constant in a given compound   Drawbacks of Dalton's...

  Adsorption Objectives: *   Define surface chemistry *  Understand the mechanism of adsorption *    Classify adsorption *    Applications of adsorption   Surface chemistry Surface chemistry is referred to as the study of the phenomenon occurring on the surfaces of substances. That is the boundary Separating 2 bulk phases. It is the study of the chemical phenomena that occur at the  interface of two surfaces which can be solid-liquid, solid-gas, solid-vacuum, liquid-gas, etc.   Who discovered adsorption? •        Carl Scheele  (1742–1786) published the first scientific adsorption measurements in 1777.   Who coined the term adsorption? The word "adsorption" was coined in 1881 by German physicist Heinrich Kayser (1853–1940). Adsorption Ø   The term adsorption was first coined in 1881 by a German physicist named Heinrich Kayser. Ø   It is the phenomenon o...