Chemistry doubts..ask here!

[haochen]

hey can u tell me how to draw the link for terylene, amide bond etc etc please

hope u got it

 

[xIshtar]

hey can u tell me how to draw the link for terylene, amide bond etc etc please

hope u got it

Yey, my description was right..

Polyamides and polyesters are okay to draw, it's when we have to identify reactants that I'm stumped ¬¬

 

[haochen]

hey, i have a qs in this paper -->http://www.xtremepapers.me/CIE/Cambridge IGCSE/0620 - Chemistry/0620_w06_qp_6.pdf---> Q4(d)---> i drew a best fit straight line for eperiment 2 and a curve for experiment 3-- I am not sure if this is what i was supposed to do... anybody got any ideas ?

you shouldnt draw a straight line. it is mentioned that smooth line curve so they will deduct mark for it and
dont forget o label both line so the examiner will give u mark

hope u got it

 

[haochen]

hey can u tell me how to draw the link for terylene, amide bond etc etc please

hope u got it

Yey, my description was right..

Polyamides and polyesters are okay to draw, it's when we have to identify reactants that I'm stumped ¬¬

ohh

 

[shan5674]

Thank you both, haochen and xishtar

 

[shan5674]

hey you guys we dont need to know extractions of metals for paper 6 right? :S and what about the habour process and contact process(sulphur)? :S not important for paper 6 right? :S

 

[narutogirl]

have a question..
What's the difference between a drying agent and a dehydrating agent n cld u gimme some examples

 

[AStarHunter]

guyz, i have a qs, what is the method for checking whether the paint is dry? It was in november 06 ---> http://www.xtremepapers.me/CIE/Cambridge IGCSE/0620 - Chemistry/0620_w06_qp_6.pdf ---> Q6(c)(i)

 

[xIshtar]

hey you guys we dont need to know extractions of metals for paper 6 right? :S and what about the habour process and contact process(sulphur)? :S not important for paper 6 right? :S

Not important for paper 6.

have a question..
What's the difference between a drying agent and a dehydrating agent n cld u gimme some examples

This is just a guess here, but maybe a dehydrating agent just removes water? I have no clue.. I know that Sulphuric acid is a drying agent for gasses.

guyz, i have a qs, what is the method for checking whether the paint is dry? It was in november 06 ---> http://www.xtremepapers.me/CIE/Cambridge IGCSE/0620 - Chemistry/0620_w06_qp_6.pdf ---> Q6(c)(i)

Leave it for three hours, then simply run a finger along it? As it says touch dry.

 

[shan5674]

guyz, i have a qs, what is the method for checking whether the paint is dry? It was in november 06 ---> http://www.xtremepapers.me/CIE/Cambridge IGCSE/0620 - Chemistry/0620_w06_qp_6.pdf ---> Q6(c)(i)

Just apply the paint somwhere (on a wall) start the timer and check if its dry (using you hand )

 

[haochen]

hey you guys we dont need to know extractions of metals for paper 6 right? :S and what about the habour process and contact process(sulphur)? :S not important for paper 6 right? :S

ur welcm

have a question..
What's the difference between a drying agent and a dehydrating agent n cld u gimme some examples

Drying agents absorb the moisture contents from a substance
Dehydration removes the water molecules so new product is formed

hope u got it
(took it from other source )

 

[shan5674]

Hey guys

im gonna go now good luck to all of youll

 

[haochen]

gud luk to u too

 

[narutogirl]

hey good luck to everyone

 

[lavanyamane]

Hey for electrolysis of copper, is the the pure copper the anode or cathode?

Pure copper is the anode and impure is the cathode.

 

[Maleeha]

@lavanyamane-- anode dissolves and cathode gains mass.. therefore anode is impure and cathode is pure. besides its ANODE sludge not cathode's..

 

[lavanyamane]

@lavanyamane-- anode dissolves and cathode gains mass.. therefore anode is impure and cathode is pure. besides its ANODE sludge not cathode's..

Yes, you're right. Sorry, my bad. Too stressed about French tomorrow!

 

[lavanyamane]

Hey for electrolysis of copper, is the the pure copper the anode or cathode?

Pure copper is the anode and impure is the cathode.

Sorry, it's the other way round

 

[Maleeha]

np