Chemistry: Post your doubts here!

[Catalan Osama Naved]

BEST TEACHER FOR CHEMISTRY IN KARACHI?

 

[A star]

The compound hex-3-en-1-ol, P, has a strong ‘leafy’ smell of newly cut grass and is used in
perfumery.
CH3CH2CH=CHCH2CH2OH
P
What is produced when P is treated with an excess of hot concentrated acidic KMnO4?
A CH3CH2CH(OH)CH(OH)CH2CH2OH
B CH3CH2CH=CHCH2CO2H
C CH3CH2CHO and OCHCH2CH2OH
D CH3CH2CO2H and HO2CCH2CO2H

i get the answer as CH3CH2CO2H and COOHCH2CH2OH which is not listed....can anyone explain my mistake please!!!

well you forgot that Alcohols are also oxidized to carboxylic acid in case of primary alcohol. hence D

 

[A star]

here u go.

thank you . your writing is awesome but poor photography

 

[Rohaan Nadeem]

Would someone please post some specified notes of CHEMICAL BONDING.

 

[snowbrood]

here u go.

urs writing is awesome

 

[daredevil]

thank you . your writing is awesome but poor photography

thankuu but it's better when i am not rushing and taking notes in class
and ummm yeah well about the photography ... *sheepish smiles* i didnt exactly use a DSLR

urs writing is awesome

thankkkss snowboarrd!! u can never hear too many compliments ^_^

 

[1357911]

Assalamualikum wr wb.
Need help regarding rate equations.
Can someone please explain? In detail.

 

[1357911]

http://chemistryatdulwich.wikispaces.com/file/view/topic 16 notes 2011.doc/424226214/topic 16 notes 2011.doc

cant open it

 

[1357911]

it's a word doc that gets downloaded automatically. Check your downloads folder

It isnt opening.. I have already checked my downloads folder.

 

[1357911]

it's a word doc that gets downloaded automatically. Check your downloads folder

or check this
http://chemistryatdulwich.wikispaces.com/Kinetics

jazakumullahi khairan.
Opened.

 

[insomniac]

Would someone please post some specified notes of CHEMICAL BONDING.

here i know my writing is a bit too small

 

[Rohaan Nadeem]

Thank you.

 

[Al-Anoud]

Aoa/Hi.
Is calcium chloride used as a drying agent to dry ammonia(gas)? Why? ..and why isn't water used?

 

[Lady Lyy]

This is regarding a mistake i did in paper 4.
there was a diagram for exorthermic reaction, and we had to complete it by writing the products and enthalpy change.
instead of writing the real products i wrote only PRODUCTS. Because i was confused!
Will that score any mark?? or do we have to write the specific products to gain the mark?

 

[insomniac]

how c

Aoa/Hi.
Is calcium chloride used as a drying agent to dry ammonia(gas)? Why? ..and why isn't water used?

how can you use water for drying ? CaCl2 absorbs water from ammonia n it is highly used for drying of amines ammonia alcohols ketones etc

 

[insomniac]

This is regarding a mistake i did in paper 4.
there was a diagram for exorthermic reaction, and we had to complete it by writing the products and enthalpy change.
instead of writing the real products i wrote only PRODUCTS. Because i was confused!
Will that score any mark?? or do we have to write the specific products to gain the mark?

err not sure if u had to fill the blank or diagram for products u had to write real products i believe

 

[insomniac]

Thank you.

mention not just pray its my chem p3 tomorrow

 

[mohammed yasser]

Please I need Chemistry Paper 5 specimen 2007
Urgent

 

[Al-Anoud]

how c how can you use water for drying ? CaCl2 absorbs water from ammonia n it is highly used for drying of amines ammonia alcohols ketones etc

Exactly what I was wondering.
Thnxx tho!

 

[Lady Lyy]

err not sure if u had to fill the blank or diagram for products u had to write real products i believe

Oh. D: tsk