Dwarka Home Tutor | Maths / Physics/CHEMISTRY Tutors in Dwarka: August 2016

Thursday, 25 August 2016

CBSE 12 maths tutors in Dwarka

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Tuesday, 23 August 2016

Chemistry home tutors in Dwarka

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Colligative property - the property which depend upon amount of substance not on the nature of substance. For example sweetness depend on amount of sugar. There are some colligative property given in solution chapter of class 12th.

Relative lowering in vapour pressure.- it means the vapour pressure of solvent decrease with amount of non volatile solvent.
Elevation in boiling point- the boiling point of solution increase with increase in the amount of solute.
Depression in freezing point - freezing point of water decrease by adding solute in it.
Osmotic pressure - it is directly proportional to amount of solute.

Sunday, 21 August 2016

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Thursday, 18 August 2016

Chemistry home tutors- Spontaneous and Non spontaneous

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Spontaneous and Non spontaneous reaction

Spontaneous reaction means the reaction which occur by itself or it require just small initiation. Normally all exothermic reaction are spontaneous reaction because they occur itself by releasing energy. For example Adding quicklime in water produce lots of energy and it occur by itself. But also there is some exceptions i.e melting of ice is a spontaneous process but it is a endothermic reaction.
Non-spontaneous process means a reaction which do not occur by itself and it require energy for completion mainly all endothermic process are non spontaneous process. For example- If you driving our car on mountain you have to race your car every time, if you don't race your car your will reverse back. So all decomposition reaction are Non spontaneous.
Driving force- the force responsible for spontaneity. Tendency to acquire minimum energy and tendency to acquire maximum randomness, i.e more disorder more randomness and reaction will be spontaneous.

Wednesday, 17 August 2016

Chemistry Tutors Dwarka - Electrophilic substitution reaction

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Electrophilic substitution reaction

Aryl halide only undergo electrophilic substitution reaction Because due to resonance the electron density on aryl halide is very high.

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Thursday, 11 August 2016

Chemistry tutor dwarka - Amorphous solids

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Amorphous solid is also considered as pseudo solids. The arrangement of atom in amorphous is not present in definite pattern. Melting and boiling point of amorphous solids are not fix. It does not give clean cut.
Glass is an amorphous solid and also considered as pseudo solids. It flow like a liquid on heating. The bottom of old building glasses are thick.

Wednesday, 10 August 2016

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Chemical kinetics

Q. Define :- 1. Order the reaction 2. Elementary step in a reaction 3. Rate law 4. Rate constant 5.molecularity.
Q. Afirst order has a rate constant value of 0.00510 /min . if we begin with 0.10M concentration of the reactant , how much of the rectant will remain after 3 hours?
Q. identify the order of a reaction if the units 1. Mol/L/s 2. L/mol/s
Q. the thermal decomposition of Hco2H is a first order reaction with a rate constant of 2.4 X 10-3 /s at a certain temperature. Calculate how long will take for three forths of initial quantity of Hco2H to decompose.[log 0.25= -0.6021]
Q. The activation energy for the reaction 2HI----( H2 + I2 is 209.5 kj/mol at 581 k . calculate the fraction of molecules having energy equal to or greator than activation energy.[R=8.31 j/k/mol]
Q. Show that first order reaction the time required for half the change is independent of initial concentration.
Q The rate of reaction increases four times when the temp. changes from 300 k to 320 k. calculate the energy of activation of the reaction.[R=8.314j/mol/k]
Q. The decomposition of PH3
4PH3----( P4 + 6H2
Rate =k[PH3]
The half life of PH3 is 37.9 s at 120 degree celcius .
How much time is required for ¾ th PH3 to decompose.
What fraction of the original sample of PH3 remains behind after 1 minute?
Q. A reaction is at first order in reactant A and of second order in reactant B . How is the rate of this reaction affected when 1. The concentration of B is increased A as well as B are doubled?
Q. The rate constant for a reaction of Zero order in a A is 0.0030 mol/l/s How long will it take for the initial conc of A to fall from 0.10M to 0.075M?

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Tuesday, 9 August 2016

Learn about Hydrogen bonding

Hydrogen bonding

Hydrogen is very important element it reacts almost all metals and non metals.According to me there is two type of hydrogen bonding Real hydrogen bonding and Non Real hydrogen bonding.
Real hydrogen bonding form between only hydrogen and oxygen, fluorine, and nitrogen. Because these three elements are high electronegative and small in size.

Real hydrogen bonding is also two types intermolecular hydrogen bonding which form between diffrent molecule and intramolecular hydrogen bonding which form between same molecule.

Non Real hydrogen bonding form between hydrogen and other elements except oxygen, fluorine and nitrogen.

organic chemistry- Aldol condensation

Aldol condensation reaction
It is kind of nuclephilic addition reaction. aldehyde and ketone undergo this reaction contains alpha hydrogen.
When two aldehyde contains alpha hydrogen reacts it give aldol.
Example- when two mole of ethanal reacts each other in presence of weak base to give 3- hydroxy butanal (aldol) and after heating the reaction it give it release water and give but-2-enal.
When two mole of ketone contains alpha hydrogen reacts it give ketol.
Example- when two mole of acetone(propanone) reacts it give
4-hydroxy- 4-methy pentan-2-one(ketol).

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Organic chemistry [Distinguish test]

Acetophenone and Benzaldehayde.
Prpanone and propanol.
Propanal and propanone
Phenol and Benzoic acid
Ethanal and propanal
Ethylamine and Aniline
Methylamine [1o amine] and Dimethylamine[2o amine]
Benzoic acid and ethyl benzoate
Aniline and Benzylamine
Aniline and N-methylaniline
Benzaldehyde and Acetophenone
Acetophenone and Benzophenone
Primary alcohol and secondry alcohol.
Phenol and Alcohol
Methyl ethanoate and ethyl ethanoate
Secondry amine and tertiary amine
Methanol and ethanol
Chlorobenzene and benzylchloride
Ethanol and Diethyl ether
Ethyl amine and Ethane amide.
Chloroform and carbon tetra chloride.

Organic chemistry [important name reaction]

Cannizaro reaction [m. imp]
Cross aldol condensation
Decarboxylation
Hoffman’s bromamide reaction
Gabrial phathalimide
Acetylation
Reimmer tiemmer reaction
Williamson’s synthesis
Gatterman
Coupling
Clemmension reduction
H.V.Z. reaction
Kolbe’s reaction
Wolf kishner reduction
Carbylamine reaction
Ammonolysis
Friedal craft reaction
Sandmeyer’s reaction
Wurtz reaction
Hinsberg’s test foer amines
Aldol condensation

Organic chemistry [Reasoning]

Pka value of carboxylic acid is decreases on increases electronegative group with carboxylic acid.
Haloarenes are much less reactive than haloalkanes towards Nucleophilic substitution reaction.
Why 1> 2> 3o faster in Sn2? And 3> 2> 1o faster in Sn1?
Pkb for aniline is more than that for methylamine
Methylamine react with ferric chloride to give precitate of ferric hydroxide.
Aniline does not undergo friedal craft reaction
Aldehydes are more reactive than ketones towards nucleophiles
Boiling point of aldehydes and ketones are lower than of the corresponding acids as well as alcohols
Aldehydes and ketones undergo a no. addition reaction
Ethanoic acid is weaker acid than benzoic acid
Basic strength arrangement of amines[m. imp]
Why phenol do not give protation reaction readily
Boiling point of ethanol is higher than methoxymethane
Phenol is more acidic than alcohol [ethanol]
O-P – nitrophenol are more acidic than phenol
Why primary amines have higher boiling than tertiary amines.amines
Dipole moment of chlorobenzene is lower than that of cyclohexyl chloride
Alkyl halides though polar but immisible with water
What is racemic mixture
Chloromethane reacts with KCN to form ethane nitrile as main product but with AgCN to form methyl isocynide
Benzyl halides show high reactivity towards Sn1.
Benzoic acid does not undergo friedal craft reaction.
Gabriel phathalimide reaction give only primary amines and it also do not give aniline?
Why Aniline give nitration on substantial amount on m –position?
Why aniline do not give direct nitration?
What is the limitations of Williamsons synthesis reagent?
What happens when excess of HI is reacted with ether
Why 2,2,5 trimethylcyclohexanone do not give cynohydrin very easily?
Why during formation of ester water shoid be removed imiediately?
Why carboxylic acid is acidic than phenol?

Organic chemistry [conversions and mechanism]

Benzene diazonium chloride --( Nitro benzene
Aniline -( Benzene diazonium chloride
Ethylamine --( methyl amine
Ethyl benzene ---( Benzoic acid
Toluene ----( Benzaldehyde [Etard reaction]
Propanone ----( propene
Benzoic acid ----( Benzaldehyde
Bromo benzene ---( 1-phenyl ethanol
Dehydration of alcohol [mechanisms]
Hydration of ethane ---( ethanol [mechanism]
Chloroethane ---( propan-1-amine
Ethane amine --( N-ethylethane amide
Primary alcohol ---( Aldehyde
Butan-2-one ---( Butan-2-ol
Phenol ----( 2,4,6-tri bromo phenol
Name the Organic compound 69.77% carbon 11.63% hydrogen and rest is oxygen. Molecular mass is 86.
Benzene -----( Acetophenone
Ethanol -----( 3- hydroxyl butane
Benzaldehyde----( Benzophenone
Organic compound A (C8 H16 O2). Its gets hydrolysed with dilute sulphuric acid and give B (carboxylic acid) and alcohol(C). oxidation of ‘C’ with chromic acid also produced B. C on dehydration gives but-1-ene. Write equations for the reactions involved.
Benzyl chloride ------( Benzyl alcohol
Methyl magnesium bromide -----( 2-methyl propan-2-ol
Ethanol ------( But-2-enal
Propanone------( 2-methyl propan-2-ol
Bromo benzene -------( Benzoic acid
Ethyl cyanide------( Etanoic acid
Methyl Benzene-----( Benzoic acid
A + Cl2-----(CHCl3 + NaOH ---(B + C6H5COCl---( C + C6H6/Alcl3----(D + E.
Phenol ----( Picric acid
Toluene + CrO3 + acetic anhydride (273-283K) ---( A + H2O/H+ --(B + conc. NaOH ---( C + sodiumbenzoate
Toluene + KmnO4 +KOH ----( A + H2O/H+ -----( E.

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