Biology; Chemistry; Physics: Post your doubts here!

[areeba fatima]

no problem . sorry for being harsh i thought u wr fooling

no no i was not...happy that the confusion is over now
and sorry if you thought i was fooling

 

[A star]

Tell me some easy way to memorize the reactivity of metals. i know my reactivity series but not which metals react with cold water, which with hot water, then with acids and so on. i can't remember if a metal will react with a specific substance or not

no clue

 

[ashiqbal]

u know what would happen if u react potassium with cold water. u will be burnd

not really :/

 

[A star]

no no i was not...happy that the confusion is over now
and sorry if you thought i was fooling

no problem now forget it and get back to topic or we will e kicked out for being off topic

 

[areeba fatima]

no problem now forget it and get back to topic or we will e kicked out for being off topic

ok

 

[syed1995]

u know what would happen if u react potassium with cold water. u will be burnd

CIE agar Potassium hota .. aur meray pass Concentrated Acid hota .. tu mein zaroor react karwata dono ko !!!

1KG K + 10 Litres of Concentrated HCL .. !!!!

 

[A star]

not really :/

hydrogen produced burns and a lilac flame . so i jst wanted to inform that its a safety hazard

 

[A star]

CIE agar Potassium hota .. aur meray pass Concentrated Acid hota .. tu mein zaroor react karwata dono ko !!!

1KG K + 10 Litres of Concentrated HCL .. !!!!

u would literally blow up the whole building may b

 

[syed1995]

u would literally blow up the whole building may b

hahaha yaanay mission successful hojayega?

 

[syed1995]

A star
ashiqbal
List All the General Formulaes of Hydrocarbons ...

 

[A star]

List All the General Formulaes of Hydrocarbons ...

are u taking a test or something

 

[syed1995]

are u taking a test or something

nai yaar apni preparation kar raha houn .. aap log meri text book aur past papers ho

 

[asd]

nai yaar apni preparation kar raha houn .. aap log meri text book aur past papers ho

Kia zamana agya hy waqai, technology itni barh gayi hy k past papers aur text books online anay lage ^

 

[syed1995]

Kia zamana agya hy waqai, technology itni barh gayi hy k past papers aur text books online anay lage ^

han woh tu kab say aanay lagi hain .. ye nai technology hai .. Bina books kholay tayyari karni ki

 

[ashiqbal]

A star
ashiqbal
List All the General Formulaes of Hydrocarbons ...

alkane: CnH2n+2
Alkene: CnH2n
Alcohol: CnH2n+1 OH (dont write Cn H2n+2 O, u will lose mark, same in carboxylic acid)
Carboxylic Acids: CnH2n+1 COOH

 

[SilverCrest]

Yes

oh kay!got it! =D

 

[syed1995]

alkane: CnH2n+2
Alkene: CnH2n
Alcohol: CnH2n+1 OH (dont write Cn H2n+2 O, u will lose mark, same in carboxylic acid)
Carboxylic Acids: CnH2n+1 COOH

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

 

[ashiqbal]

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

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!

 

[A star]

pentyl methanoate
butyle ethanoate
hexyl ethanoate(not in syllabus)
methyl propanoate

 

[asd]

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

In each, Only H atoms are removed from Carboxylic acids, and OH from Alcohols. This forms water, while the remaining part is the ester. You always draw* the remaining acid part first and then the alcohol part. Try doing yourself and post your answers here, I'll check them *Like A Teacher(Boss)*