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