Chemistry: Post your doubts here!

[A star]

haayyy english plsss! i see this as fdlkfqjdn;d;rk

i said please do it. i wouldnt have to open a book then. sorry force of habbit

 

[Jinkglex]

Ahahaha well saari ka to pata nahi but anyway what i understood from Organic and nitrogen and sulphur:

Nitrogen and Sulphur:

N2 is highly unreactive due to N-N triple bond
N reads with O to give NO in car exhausts due to high heat, further oxidised to NO2 by air, mixes with H20 in rain to give acid rain
S reacts with O to give SO2 in car engines, SO2 can be oxidised by NO2 to give SO3, or mix with H20 to give acid rain
Haber process consists of N2 and H2 mixed under conditions:
450C
200 ATM pressure
Iron catalyst

Exothermic process, Ammonia made and tapped out, later used for fertilizers

Sulphuric acid made by Contact process

Reactions include:

S+O2 -> S02
S02+O2-> S03 THIS IS REVERSABLE REACTION AND ALSO USES VANADIUM {V} OXIDE CATALYST
SO3+H20-> H2S04 [THIS REQUIRES US TO USE 98% SOLUTION OF H2S04 AND H20 TO AVOID MIST FORMING OF H2S04]

CONDITIONS INCLUDE:
450C
1-2 ATM
VANADIUM [V] OXIDE CATALYST.
H2s04 also used in cleaning, fertilizers etc.
S02 and S03 used to preserve food as they inhibit growth of bacteria. Work best at acidic mediums.

ORGANIC:

free radicals made using UV light
NAOH [AQ] forms OH nucleophile [NAOH aq can also do HYDROLYSIS]
NAOH [ethanol] does elimination reaction
AL203 does cracking and elimination/dehydration
ALCL3+CL2 generates Chlorine ELECTROPHILE.
PCL5/SOCL2 generate Chlorine NUECLEOPHILE.
Above can be used for any Halides btw.
Br[AQ] does electrophilic ADDITION
Electrophilic substitution is not part of AS syllabus
NACN+HCL generates HCN for nucleophilic ADDITION
KCN [Ethanol] generates CN NUECLEOPHILE
Conc H2S04 does ESTERFICATION, DEHYDRATION, AND HYDROLYSIS

Those are it I think...Did i miss anything or do anything wrong?

 

[daredevil]

lmao took me an hour too make.
check if all ok

yeah ok i'll c them
and a quick tip should i revise from the boook?? wat do u suggest?? like in these few hours that i have.... should i revise from the book or do past papers?
i was thinking that go through everything once... learn stuff i forget and then switch over to past papers if i have time left.... wat do u say?

 

[Jinkglex]

I'll only be discussing P2 btw, since tomorrow its P2 only, P4 etc will be dealt with...later

 

[A star]

i

yeah ok i'll c them
and a quick tip should i revise from the boook?? wat do u suggest?? like in these few hours that i have.... should i revise from the book or do past papers?
i was thinking that go through everything once... learn stuff i forget and then switch over to past papers if i have time left.... wat do u say?

think revise all reactions once and then go through inorganic once then past paper time

 

[A star]

a go through thorough reading time up

 

[iKhaled]

I'll only be discussing P2 btw, since tomorrow its P2 only, P4 etc will be dealt with...later

are you doing both AS and A2 this year ?

 

[Jinkglex]

are you doing both AS and A2 this year ?

Yes boss.

 

[Alice123]

anytime! please do feel free to ask me for any other summaries, it helps my revision also, and feel free to contribute

Period 3 reactions if it doesnt waste much of yr tym....... Thanks for yr previous effort.......

 

[ZainH]

Ahahaha well saari ka to pata nahi but anyway what i understood from Organic and nitrogen and sulphur:

Nitrogen and Sulphur:

N2 is highly unreactive due to N-N triple bond
N reads with O to give NO in car exhausts due to high heat, further oxidised to NO2 by air, mixes with H20 in rain to give acid rain
S reacts with O to give SO2 in car engines, SO2 can be oxidised by NO2 to give SO3, or mix with H20 to give acid rain
Haber process consists of N2 and H2 mixed under conditions:
450C
200 ATM pressure
Iron catalyst

Exothermic process, Ammonia made and tapped out, later used for fertilizers

Sulphuric acid made by Contact process

Reactions include:

S+O2 -> S02
S02+O2-> S03 THIS IS REVERSABLE REACTION AND ALSO USES VANADIUM {V} OXIDE CATALYST
SO3+H20-> H2S04 [THIS REQUIRES US TO USE 98% SOLUTION OF H2S04 AND H20 TO AVOID MIST FORMING OF H2S04]

CONDITIONS INCLUDE:
450C
1-2 ATM
VANADIUM [V] OXIDE CATALYST.
H2s04 also used in cleaning, fertilizers etc.
S02 and S03 used to preserve food as they inhibit growth of bacteria. Work best at acidic mediums.

ORGANIC:

free radicals made using UV light
NAOH [AQ] forms OH nucleophile [NAOH aq can also do HYDROLYSIS]
NAOH [ethanol] does elimination reaction
AL203 does cracking and elimination/dehydration
ALCL3+CL2 generates Chlorine ELECTROPHILE.
PCL5/SOCL2 generate Chlorine NUECLEOPHILE.
Above can be used for any Halides btw.
Br[AQ] does electrophilic ADDITION
Electrophilic substitution is not part of AS syllabus
NACN+HCL generates HCN for nucleophilic ADDITION
KCN [Ethanol] generates CN NUECLEOPHILE
Conc H2S04 does ESTERFICATION, DEHYDRATION, AND HYDROLYSIS

Those are it I think...Did i miss anything or do anything wrong?

ARE YOU SERIOUS?

 

[daredevil]

a go through thorough reading time up

hmmm that's a pretty gud suggestion...
urrggh i just hope it goes well :O

 

[Jinkglex]

Electrophilic substitution occurs only in Benzene and Aryl compounds as far as i know, which only appear in A2.

And sure Alice np, just lemme finish my read-through of the book and i'll share 'em

 

[daredevil]

Ahahaha well saari ka to pata nahi but anyway what i understood from Organic and nitrogen and sulphur:

Nitrogen and Sulphur:

N2 is highly unreactive due to N-N triple bond
N reads with O to give NO in car exhausts due to high heat, further oxidised to NO2 by air, mixes with H20 in rain to give acid rain
S reacts with O to give SO2 in car engines, SO2 can be oxidised by NO2 to give SO3, or mix with H20 to give acid rain
Haber process consists of N2 and H2 mixed under conditions:
450C
200 ATM pressure
Iron catalyst

Exothermic process, Ammonia made and tapped out, later used for fertilizers

Sulphuric acid made by Contact process

Reactions include:

S+O2 -> S02
S02+O2-> S03 THIS IS REVERSABLE REACTION AND ALSO USES VANADIUM {V} OXIDE CATALYST
SO3+H20-> H2S04 [THIS REQUIRES US TO USE 98% SOLUTION OF H2S04 AND H20 TO AVOID MIST FORMING OF H2S04]

CONDITIONS INCLUDE:
450C
1-2 ATM
VANADIUM [V] OXIDE CATALYST.
H2s04 also used in cleaning, fertilizers etc.
S02 and S03 used to preserve food as they inhibit growth of bacteria. Work best at acidic mediums.

ORGANIC:

free radicals made using UV light
NAOH [AQ] forms OH nucleophile [NAOH aq can also do HYDROLYSIS]
NAOH [ethanol] does elimination reaction
AL203 does cracking and elimination/dehydration
ALCL3+CL2 generates Chlorine ELECTROPHILE.
PCL5/SOCL2 generate Chlorine NUECLEOPHILE.
Above can be used for any Halides btw.
Br[AQ] does electrophilic ADDITION
Electrophilic substitution is not part of AS syllabus
NACN+HCL generates HCN for nucleophilic ADDITION
KCN [Ethanol] generates CN NUECLEOPHILE
Conc H2S04 does ESTERFICATION, DEHYDRATION, AND HYDROLYSIS

Those are it I think...Did i miss anything or do anything wrong?

MAN!! U r AAWWssuM!!
keep up the gud work dude =)

 

[Ahmedraza73]

WHat are half equations?
can someone give me an example of that.

 

[MaxStudentALevel]

anytime! please do feel free to ask me for any other summaries, it helps my revision also, and feel free to contribute

Could you give a summary (very intuitive) on partition coefficients?

 

[Ahmedraza73]

Can anyone me the Colour list of compounds?
Please anyone can anyone post it

 

[Jinkglex]

Ty daredevil, btw im appearing from Lahore too

And Ahmedraza, half equations show participants of the reaction removing spectator ions:

e.g: CUS04 + ZN -> ZNSO4 + Cu.

as SO4 anion remains constant and doesnt change in oxidation state it simply becomes

Cu2+ + Zn-> Zn2+ + Cu.

I didnt show charges on the former equation but im sure you know their individual oxidation states

 

[daredevil]

Can anyone me the Colour list of compounds?
Please anyone can anyone post it

how do u mean colour list??
ummm generally metal compounds are all white except for transition metals
Iodide and also chromate compounds with transition metals are yellow

if i am wrong plz correct me ppl =)
and thanku for the reference Jinkglex =) i'll take that as a compliment ^_^

 

[knowitall10]

Aoa wr wb

Can someone please draw a diagram for qn 1 of this paper ?

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s12_qp_52.pdf
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s12_ms_52.pdf

Thanx a lot


PS: I'd really appreciate if someone can upload solved paper 5s for chemistry qn 1 of different years, thanx

Here's the diagram:
I didn't check the mark scheme though....
I'll do it now..

 

[ZainH]

Electrophilic substitution occurs only in Benzene and Aryl compounds as far as i know, which only appear in A2.

And sure Alice np, just lemme finish my read-through of the book and i'll share 'em

Are you sure it's not included..? e_e