Biology; Chemistry; Physics: Post your doubts here!

[syed1995]

ESTER FORMATION, WHAT YOU MUST ALWAYS REMEMBER:

NOL DAC
Name alcohOL first, Draw ACid First!

so for 1: pentyl methanoate ; HCOOC5H11
2: butyl ethanoate; CH3COOC4H9
3: HEXYL BUTANOATE ; C3H7COOC6H13
4: try to do it youself. Remember : NOL DAC!

NOL DAC FTW!!!

Thanks a lot dude

 

[A star]

ESTER FORMATION, WHAT YOU MUST ALWAYS REMEMBER:

NOL DAC
Name alcohOL first, Draw ACid First!

so for 1: pentyl methanoate ; HCOOC5H11
2: butyl ethanoate; CH3COOC4H9
3: HEXYL BUTANOATE ; C3H7COOC6H13
4: try to do it youself. Remember : NOL DAC!

syed1995 remeber DAC part of NOL DAC is not cumpolsury so donot think it is wrong what u wr doing bfr

 

[syed1995]

Yaar Ester formation ki bhi 2-3 examples kardo .. taakay woh bhi Pakki hojayein ..

Give Names and Structural Formulas Of.
1) Methanoic Acid + Pentanol
2) Ethanoic Acid + Butanol
3) Butanoic Acid + Hexanol
4) Propanoic Acid + Methanol

1) Pentyl Methanoate HCOOC5H11
2) Butyl Ethanoate CH3COOC4H9
3) Hexyl Butanoate C3H7COOC6H13
4) Methyl Propanoate C2H5COOCH3

All correct?

 

[Durrani]

whats the solid used to neutralize acidic soil?
Ca(OH)2

 

[syed1995]

whats the solid used to neutralize acidic soil?
Ca(OH)2

Yep.. CaCO3 would work too.. because its alkaline and insoluble!

 

[Durrani]

decomposition of sodium azdide.. NaN3

 

[syed1995]

A star
ashiqbal

Give the names of Monomers Used and The Type of linkages present in

1) Polyester
2) Terylene
3) Nylon
4) Protein
5) Fats
6) Carbohydrates
7) PVC (Poly Vinyl Chloride)
8) Polypropene

 

[syed1995]

decomposition of sodium azdide.. NaN3

whaat ?? I don't think that's in our syllabus!! And I don't think it will decompose and Na compounds are really strong .. they are too stable for them to be broken by heating ... (from the concept with carbonates)

 

[syed1995]

I will be back in 3-4 hours .. gonna take a nap now

 

[asd]

A star
ashiqbal

Give the names of Monomers Used and The Type of linkages present in

1) Polyester
2) Terylene
3) Nylon
4) Protein
5) Fats
6) Carbohydrates
7) PVC (Poly Vinyl Chloride)
8) Polypropene

1 & 2) Terylene itself is a polyester. And as the name suggests, the linkages are ester-type (COO and O). Monomers: Dicarboxylic acids and Diol.
3 & 4) Nylon and Protein both have amide linkages. Monomers: Dicarboxylic acids and Diamines
5) Fats are made from fatty acids and glycerol. (same ester linkage as in polyesters)
6) NOT in syllabus. Though i know that Ether linkages are present in these and Idk their monomers.
7 & 8) NOT in syllabus.

 

[Durrani]

whaat ?? I don't think that's in our syllabus!! And I don't think it will decompose and Na compounds are really strong .. they are too stable for them to be broken by heating ... (from the concept with carbonates)[/q
there is decompostion and is in june 2000 paper

 

[Durrani]

1 & 2) Terylene itself is a polyester. And as the name suggests, the linkages are ester-type (COO and O). Monomers: Dicarboxylic acids and Diol.
3 & 4) Nylon and Protein both have amide linkages. Monomers: Dicarboxylic acids and Diamines
5) Fats are made from fatty acids and glycerol. (same ester linkage as in polyesters)
6) NOT in syllabus. Though i know that Ether linkages are present in these and Idk their monomers.
7 & 8) NOT in syllabus.

 

[Durrani]

6) for ployvinyl chloride, monomers are vinyl chloride..
7 and 8) monomers for polypropene are propene only.. they contain ether linkage

 

[A star]

decomposition of sodium azdide.. NaN3

its not in course. well it mayb if u wana open a bakery

 

[Durrani]

6) for ployvinyl chloride, monomers are vinyl chloride..
7 and 8) monomers for polypropene are propene only.. they contain ether linkage

sorry.. 6) carbohydrates monomers are glucose and have ether linkage and 7 & 8 have vinyl chloride and propene as their monomers with additional type of reaction

 

[Durrani]

its not in course. well it mayb if u wana open a bakery

u could answer if u knew.. and u dont so shush.. !!

 

[Durrani]

Which salt can be prepared by an acid-alkali titration method?
A ammonium sulphate
B copper(II) sulphate
C iron(II) sulphate
D zinc sulphate

 

[A star]

u could answer if u knew.. and u dont so shush.. !!

well it is used to inflate pasteries in bakeries donot mess with me over chem and ans is A

 

[SilverCrest]

What is the difference between the structure of fats and terylene?

 

[Durrani]

any one with an answer?