Chemistry Coaching Classes in Nangloi, Delhi

half-life t1/2 = 0,693/k = 0.693/45 =0.0154 min-1 .

Slaking of lime is conversion of CaO (Calcium Oxide) to Ca(OH)2 (Calcium Hydroxide) by mixing it (CaO) with water (H2O). This is a highly exothermic reaction. Calcium Hydroxide is also called slaked lime.

CaO(s) + H2O(l) -> Ca(OH)2 + Heat

The statement means 19 gms of CuSO4 completely dissolves in 100 gms of water at 15 ⁰C temperature.

Carbon tetrachloride is an organic compound with chemical formula CCl4. It appears as a colourless liquid with a sweet characteristic smell . it is denser than water.It is insoluble in water , not flammable in nature.it does not dissolve in water easily but soluble in organic solvents.widely used as a solvent.largely used as a fire extinguisher.

Chloroform is also an organic compound with chemical formula CHCl3 . It also appears as a colourless liquid with a sweet smell . It is also insouble in water.It is non-flammable liquid.however vapour chloroform burn with green flame.It is soluble in organic solvent.It was used as an anaesthetic .used in refrigeration.It is also denser in water.

SN1 reaction is nucleophilic substitution , unimolecular reaction.rate of reaction depends on only one of the reactants.in this type of reaction ,substitution takes place with the help of a nucleophile.this type of reaction completes in two steps.

Example- t-butyl chloride +NaOH(aq.)= t-butyl alcohal + NaCl

# SN2 reacton is nucleophilic substitution,bimolecular reaction. rate of reaction depends on both of the reactants.In this type of reaction substitution takes place with the help of a strong nucleophile.this type of reaction completes in one step only.

Example- methyl chloride +NaOH (aq,) = methyl alcohol + NaCl  

H2SO4=SO3+2H2O Upon heating it loses two molecules of water.

It is the minimum anode voltage for which the photo-current of the circuit reduces to zero

refer to attachment

in acetelene, C is sp hybridised. in which %s character = 50%. size of s orbital is small, so elecrtonegativity of sp hybridised C is more. after realsing the H atom carbanion is to be stable, ie. release of H atom is easier, therefore acetelene is acidic.

one of the most common examples of both physical and chemical change are (1) boiling of an egg and (2) cooking of food.

in both cases, the physical appearance of the substances change and new substances are formed.