Biology; Chemistry; Physics: Post your doubts here!

[rabiafarooq101]

everyone just relax chem is easy u just need to have a fresh mind for it ur theory shud be really good just practisce max mcqs then do 5 theory papers and u r good to go

 

[MustafaMotani]

thnks !!

*phew*

Any time

 

[MustafaMotani]

everyone just relax chem is easy u just need to have a fresh mind for it ur theory shud be really good just practisce max mcqs then do 5 theory papers and u r good to go

K

 

[SalmanPakRocks]

Stay on topic and refrain from any paper discussion.

 

[a.abid]

Ok guysss just for my revision for macromolecules,Im summing up the important condensation polymers as follows...P.S:Correct me if I am wrong
Nylon: Dicarboxylic and Diamino
Protein:Carboxylic and amino
Similarity:Amide linkage

Terylene: dialcohol and Dicarboxylic
Fats: fatty acid(carboxylic)+ glycerol(alcohol)
Similarity:Ester Linkage

Starch: glucos+glucose(alcohol+alcohol group)

 

[kitecrystal]

Which property do diamond and graphite have in common?
A They are giant structures.
B They can act as lubricants.
C They can conduct electricity.
D They contain only covalent bonds.
why is the option D wrong?

 

[rabiafarooq101]

Ok guysss just for my revision for macromolecules,Im summing up the important condensation polymers as follows...P.S:Correct me if I am wrong
Nylon: Dicarboxylic and Diamino
Protein:Carboxylic and amino
Similarity:Amino group

Teryleneialcohol and Dicarboxylic
Fats: fatty acid(carboxylic)+ glycerol(alcohol)
Similarity:Ester Linkage

Starch: glucos+glucose(alcohol+alcohol group)

protein only has amino no carboxylic acid

 

[rabiafarooq101]

Which property do diamond and graphite have in common?
A They are giant structures.
B They can act as lubricants.
C They can conduct electricity.
D They contain only covalent bonds.
why is the option D wrong?

because layers in graphite are bonded by weak vaanderwals forces

 

[Translucent231]

Ok guysss just for my revision for macromolecules,Im summing up the important condensation polymers as follows...P.S:Correct me if I am wrong
Nylon: Dicarboxylic and Diamino
Protein:Carboxylic and amino
Similarity:Amino group

Teryleneialcohol and Dicarboxylic
Fats: fatty acid(carboxylic)+ glycerol(alcohol)
Similarity:Ester Linkage

Starch: glucos+glucose(alcohol+alcohol group)

well for protein its more clear if u write Amino Acid + Amino Acid which is a monomer with cooh on one side and nh2 on other side.

 

[MustafaMotani]

Ok guysss just for my revision for macromolecules,Im summing up the important condensation polymers as follows...P.S:Correct me if I am wrong
Nylon: Dicarboxylic and Diamino
Protein:Carboxylic and amino
Similarity:Amino group


similarity is amide linkage

 

[a.abid]

protein only has amino no carboxylic acid

i guess it has carboxylic also cuz on one side its COOH group and the other NH2 group

 

[asd]

Ok guysss just for my revision for macromolecules,Im summing up the important condensation polymers as follows...P.S:Correct me if I am wrong
Nylon: Dicarboxylic and Diamino
Protein:Carboxylic and amino
Similarity:Amino group

Teryleneialcohol and Dicarboxylic
Fats: fatty acid(carboxylic)+ glycerol(alcohol)
Similarity:Ester Linkage

Starch: glucos+glucose(alcohol+alcohol group)

LMAO at icarboxylic acid. Correct.
But i thought they were called amine, not amino.

 

[khizer shahab]

Which property do diamond and graphite have in common?
A They are giant structures.
B They can act as lubricants.
C They can conduct electricity.
D They contain only covalent bonds.
why is the option D wrong?

option A right ans

option D is wrong because sometime carbons of diamon make a new diamond by reacting with other element like Na (google it with yellow diamond )

thats wat ithink might any body else have better explanation !!

 

[kitecrystal]

because layers in graphite are bonded by weak vaanderwals forces

vaanderwals ??

 

[asd]

i guess it has carboxylic also cuz on one side its COOH group and the other NH3 group

True.

 

[rabiafarooq101]

i guess it has carboxylic also cuz on one side its COOH group and the other NH3 group

if u read the syllabus then the major differnce btw nylon and protien is that
nylon dicarboxylic acid and diamine
protein amino acids

 

[Translucent231]

diamond has completely covalently bonded structure graphite also has vanderwal forces between layers as stated by rabiafarooq101

 

[a.abid]

LMAO at icarboxylic acid. Correct.
But i thought they were called amine, not amino.

yeah its amine...sorry my mistake

 

[a.abid]

if u read the syllabus then the major differnce btw nylon and protien is that
nylon dicarboxylic acid and diamine
protein amino acids

yes its amino acids---its a major difference i was tallking abt the structures we draw

 

[Translucent231]

vanderwaaal basically means WEAK forces