Chemistry Coaching Classes in Filmistan, Delhi

Gas can defuse faster as molecules are far apart in gas than solid so the molecular attraction is very weak for gas molecules and it can defuse rapidly.

The branch of science that deals with the appearance, structure, composition, nature and uses of all the substances of matter, as well as, their properties and conditions for reactions among them is called Chemistry.

During frosting, water converts into ice i.e,the substance changed from liquid state to solid state. Here the state of the substance is changed which is a physical change and no new compound is formed which means it is not a chemical change.

Freezing point in depression occurs when freezing point of a liquid(solution)is lowered or depressed by adding another compound (solute)to it. The solution has lower freezing point than that of the pure solvent.

Dear in question given 19g/100g (19gram / 100 gram) is like W/W (weight / weight ) ratio. the statiment say that 19 grams of CuSo4 completly dissolves in 100 grams (One litre of water has a mass of almost exactly one kilogram for some condition) of water at temperature 15 degrees centigrade.

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When CaO(quick lime)reacts with water then it gives slaked lime Ca(OH)2 and this process is known as slaking of lime.It releases very much heat. CaO+H20 -> Quick lime Ca(OH)2+ Heat Slaked lime

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

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.