Chemistry : Tips & Tricks

Mole Concept
Principle of Atom Conservation :

No. of moles of an atom in Reactants = No. of moles of the atom in Products.

In reaction, H2 + O2 ---> H2O

No. of moles of O2= No. of moles of H2O

2 x No. of moles of O2 = No. of moles of O in H2O

Chemical Bonding

 * 1) To detect the type of Hybridization, use the formula : N = GA + 1/2 {VE - V - C}  ; where N is the number of hybrid orbitals , GA is Number of Atoms or groups attached , VE is number of Valence Electrons , V is Valency of Central Atom , C is charge on cation or anion.

Equilibrium

 * 1) While dealing with Ksp, Ionic Product , ka and kb, Rely on the equations and it's stoichiometry . Raise the concentrations to the power of stoichiometric co-efficient . The PPowers are not raised only in the chapter Chemical Kinetics.

Nuclear Chemistry

 * 1) The Radioactive disintegration follows first Order Kinetics . Thus, formulae of Chemical Kinetics for first order kinetics can be used.

Organic Chemistry

 * 1) For Stability, consider Resnance . If the compound has double/triple bond or lone pair of electrons in conjugation , then it is stabilized by resonance.
 * 2) For Organic Chemistry Reactions, for predicting the product , use the concept of Nucleophiles/Electrophiles . Negative part goes to positive part of carbon chain and vice versa . The positive/negative part of carbon chain may shift according to stability.