Chemistry V1 (discussion)

[Manobilly]

It was easy!Most questions were repeated

 

[somaya]

P2Q
Harder than copper
doesnt conduct electricity at all but volatile
for the homologous series one, it is either both (alkene and alcohol) or none. im not sure but i did it both

it shud b both alkene nd alcohol

 

[Yousif Mukkhtar]

It was easy!Most questions were repeated

Yes, it was elhemdela fine. It was much better than May June 2011.

 

[Yousif Mukkhtar]

El hemdela that IGCSE ended fine with Chemistry Paper 11. I wish to all a good holiday.

Goodbye Chemitry, this will be the last time I will see you.

 

[Gunner7]

Question 34 which functional group did the compound contain ? I chose A ,all the 3 functional groups were there ?

Iron is more harder to extract than copper, more reactive metals form more stable compounds, it was P2Q and I chose for homologus series alkene and alcohol

 

[shalala]

it shud b both alkene nd alcohol

it cannot be both Alcohol is cannot polymerise...

 

[19loko97]

can anybody remind me the question about the homologous series

 

[thats_me]

Did it ask for polymerizatation??? :s

 

[mania _ manal]

what about the teeth plating one ??

 

[Skynox]

Guys it is either none or alkene only...
How can a substance have two homologus series...
If the question was asking about the monomer then alkene only since an alcohol of 2 carbons should contains 5 hydrogen…
If it was about polymer then either none or alcohol..Checked wikipedia PVA stands for polyvenyl alcohol..
But in alcohol homologus series general formula is cn h2n+1 oh

 

[Gunner7]

what about the teeth plating one ??

Negative and graphite?

 

[19loko97]

it was neither one of them, because alcohol can't have double bonds and alkenes can't have oxygen

 

[thats_me]

I think ur right! :/

Guys it is either none or alkene only...
How can a substance have two homologus series...
If the question was asking about the monomer then alkene only since an alcohol of 2 carbons should contains 5 hydrogen…
If it was about polymer then either none or alcohol..Checked wikipedia PVA stands for polyvenyl alcohol..

 

[19loko97]

what about the 3rd question where it asked which apparatus is needed, i put all of them

 

[Skynox]

I did it none (Y)…Hopefully it is...Polymers are saturated so it couldnt be alkenes…and alcohol dont polymerise..There was a questio about ethanol polymeriZation…

 

[mania _ manal]

what about the 3rd question where it asked which apparatus is needed, i put all of them

yah i did the same

 

[salvatore]

Guys it is either none or alkene only...
How can a substance have two homologus series...
If the question was asking about the monomer then alkene only since an alcohol of 2 carbons should contains 5 hydrogen…
If it was about polymer then either none or alcohol..Checked wikipedia PVA stands for polyvenyl alcohol..
But in alcohol homologus series general formula is cn h2n+1 oh

I wrote alcohol.. coz that was surely ethanol! In addition, alcohol can polymerise to form polyester (Is that right? )

 

[Skynox]

I wrote alcohol.. coz that was surely ethanol! In addition, alcohol can polymerise to form polyester (Is that right? )

Ethanol should have 5 hydrogen and esterification is not polymerization..ethanol according to several ms
Cant polymeriZe so alcohol cant

 

[19loko97]

doesn't the volume of acid affect the rate of a reaction

 

[Skynox]

doesn't the volume of acid affect the rate of a reaction

What's that ?
And again homologus series should have both same general formula and same functional group..General formula is CH(2n+1)OH