SAI'S SCIENCE AND MATHS CLASSES

Points to Ponder (CBSE X science) Catenation  IUPAC Name Isomerism Structures of covalent compounds including cyclic compounds ,Benzene etc Types of reactions( Combustion,Oxidation,Addition and Substitution ) Hydrogenation Esterification Saponification Dehydration of alcohol Test for un saturation using Br water and KMnO4 Soap R-COONa  Cleaning action, including structure of miscelle  Hard water , scum (R-COO) 2 Mg Detergents Periodic property of elemets Mendeleev,Modern Understanding of Group and period with valency,shell number and molecular formula Analyse the part of Periodic table Physics Laws of refraction Snells law, refractive index (Numericals) Optical density including ray diagrams Mirror formula, Magnification, real /virtual images Lens formula with numericals Ray diagram with position of objects Uses of mirror and lens Sign conventions Eye defects there correction with ray diagram Power its SI unit Atmospheric refraction / ...

How many moles and molecules are present in 50 Kg marble? Clue: Marble is calcium carbonate whose molecular mass is 100 u convert 50 Kg to gram ie 50,000 g so number of moles is 50,000/100=500 moles one mole contains 6X10^23 molecules so calculate the number of molecules by multiplying it with 500

The Crash Course for Physics ( Plus2 and Plus1) is on !! 

Schwarzschild radius a Simple derivation If  the radius of a spherical body is less than Schwarzschild radius  it is called a black hole. And for a black hole the escape speed is equal to the speed of light. Schwarzschild radius , r s = 2GM / C 2    Usually the solution is obtained from EFE (Einstein’s Field Equation ) Proof For a planet the escape speed is related to its mass and radius , this is obtained by equating kinetic energy to the gravitational potential energy V escape 2  = 2GM / R So for a black hole   C 2 =2GM / R And R= r s Therefore r s = 2GM / C 2    

Dear Students Now it is time for SA2 The important questions on Carbon and its Compounds I am sharing with you Please click the following link  Carbon and its Compounds Regards

SA 1  Chemistry Points to Remember During electrolysis of water hydrogen @ cathode and oxygen @ anode (in the ratio 2:1) Colour of potassium nitrate is yellow ;  nitrogen di oxide is a brown fume formed during thermal decomposition of KNO 3  Gypsum, plaster of paris, blue vitriol(Cu SO 4 ), washing soda have water of crystallization  Amalgam is a metal in Mercury Galvanization coating metal with Zn Lustrous non metal is Iodine Liquid non metal is Br Liquid metal is Hg pH is the measure of acidic or basic character of a medium It determines the amount of hydronium ion in the medium Oxidation is loss of electron ; reduction is gain Electrolysis is a redox reaction Na OH is formed from brine solution by Chlor alkali process Carbonates and bicarbonates liberate CO 2  when treated with an acid Very dilute Nitric acid gives hydrogen with Mg and Mn only Hydrogen is used in the preparation of Margarine and chlorine in making PVC and CFCs Th...

Short description on Magnetic effect (class IX) The magnetic effect of electric current was discovered by Hans Christian Oersted . The magnetic field strength ( B ) is determined by the strength of the current The magnetic strength decreases as we move away from the conductor The magnetic field lines (imaginary) created by a long conductors is in the form a concentric circle with the axis of conductor at the centre The direction of magnetic field in a current carrying wire can be determined by Right Hand Thumb rule or Cork Screw rule.  SI unit of Magnetic field is Tesla  other unit is Gauss .