Physics, Chemistry and Biology: Post your doubts here!

[Maz]

jazakallah, so dis is just a polyester?

Yup.

 

[AAnsarii]

jazakillah thats_me

 

[Manobilly]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_s07_qp_3.pdf
7(b)they say draw terylene
plz xplain...thx

Here is a drawing hope helps u.

 

[uzair2013]

Tropospheric ozone is a greenhouse gas and initiates the chemical removal of methane and other hydrocarbons from the atmosphere. Thus, its concentration affects how long these compounds remain in the air.http://en.wikipedia.org/wiki/Tropospheric_ozone

Thanxxx!!!

 

[imperial]

am very lost in this whole polymer thing,
can someone explain the folowing:
everything about nylon 8,8 (drawing, monomer drawing, the chemicals used to form the monomer)
what do we need to know about natural polymer, fats, carbohydrate, protein
what is those squares and these things in the polymer

and also 2 question:
what is the acid and base reactions with ester
and what does the square sign indicates in things like (CH2)2 -CH2-CH3


these the only things i couldnt handle in any past paper, and i think if i knew them i would be ready to the exam

 

[AAnsarii]

Here is a drawing hope helps u.

Maz said u can draw like boxes, like d 1s in polyster
ne way, thanks.

 

[Maz]

You'll have got me worried. As far as I know we do not need to know the monomers of terylene (or for that matter nylon too).

 

[Manobilly]

yeah the boxes is also

Maz said u can draw like boxes, like d 1s in polyster
ne way, thanks.

good

 

[AAnsarii]

You'll have got me worried. As far as I know we do not need to know the monomers of terylene (or for that matter nylon too).

sorry

 

[AAnsarii]

Sn + 2Ag+ =
Sn2+ + 2Ag
is d valency of Sn 2 and dat of Ag 1? its given so in d ms

 

[Maz]

sorry

I didn't mean that to you.
By the way, i hope this makes everything clear.

 

[Maz]

Sn + 2Ag+ =
Sn2+ + 2Ag
is d valency of Sn 2 and dat of Ag 1? its given so in d ms

Yes. (eg of a redox reaction)

 

[imperial]

am very lost in this whole polymer thing,
can someone explain the folowing:
everything about CONDENSATION POLYMERIZATION and one example
what do we need to know about natural polymer, fats, carbohydrate, protein
what is those squares and these things in the polymer

and also 3 question:
what is the acid and base reactions with ester
and what does the square sign indicates in things like (CH2)2 -CH2-CH3
BREAKING BOND, FORMING BOND, BOND ENERGY AND WHAT IT HAVE TO DO WITH EXOTHERMIC AND ENDOTHERMIC


these the only things i couldnt handle in any past paper, and i think if i knew them i would be ready to the exam

edited

PLEASE HELP, THERE IS NOT MUCH TIME AND IAM COMPLETELY CLUELESS ABOUT THESE

edited again

 

[EpicLol]

Best of luck everyone for tomorrow
DO WELL IN CHEM PAPER 3 Wish me luck too XD

 

[AAnsarii]

Yes. (eg of a redox reaction)

but d periodic table says dat Sn's 4 n Ag is (not PT) 2....

 

[Maz]

am very lost in this whole polymer thing,
can someone explain the folowing:
everything about nylon 8,8 (drawing, monomer drawing, the chemicals used to form the monomer)
what do we need to know about natural polymer, fats, carbohydrate, protein
what is those squares and these things in the polymer

and also 2 question:
what is the acid and base reactions with ester
and what does the square sign indicates in things like (CH2)2 -CH2-CH3


these the only things i couldnt handle in any past paper, and i think if i knew them i would be ready to the exam

Okay.
Regarding the first part I just gave 2 images from the syllabus copy which i hope would make it easy.

 

[AAnsarii]

qp33_w10_chem. 5(b)(iv) can i have d structure wid d bonds?

 

[Maz]

but d periodic table says dat Sn's 4 n Ag is (not PT) 2....

Sn has the variable valencies of 2 and 4.
While, Ag has the variable valencies 1 and 2.

 

[imperial]

Okay.
Regarding the first part I just gave 2 images from the syllabus copy which i hope would make it easy.

i got a help thro the inbox for the polymer part, help please in the 2nd part of my edited post?

 

[gelato]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_s05_qp_3.pdf
2 c) i) What's the reason?