How was Chemistry P1/2

[beeloooo]

i wrote that it is oxidised to methanoic acid .. isnt that correct ?

it is !!

 

[M Haseeb Javed]

Copper(I) Chloride or Copper(II) Chloride? Copper(I) Chloride is an insoluble salt while Copper(II) Chloride is soluble so it depends.
And the salts formed could have been either Calcium Nitride or Calcium Nitrate. Both are correct.

I wrote Calcium Oxide.. cnt that be a option

 

[Doosh Bag]

Methanol was definitely correct - in my last 5 mins, I went through it again and again and I can assure you the structure was the very least correct.

H
I
H-C-OH
I
H

This is correct.

 

[Doosh Bag]

please search thoroughly and its wikipedia that also states that mercury is a weak electrolyte

Don't worry beelooo mate, I'm sure we have got that one correct.mit was mercury

 

[IARK]

pentane one was D , the forces of attraction always contribute to the boiling point !!..

while the methanol mcq was A !! it was also confirmed by the last question in p2 !! they asked for a FULL structure of methanol it was wrong as a bond between O-H was missing !! got it >? !!

yup the addition reaction was the bromine one D !!

for the people who are arguing over mercury , and the arguements they are making are pointless like it is a metal and very good conductor i can't help them !! Mercury is a fair conductor of electricity as it is a liquid it can't conduct it the way other metals do plus it is a weak electrolyte !! as u can find it everywhere when u search ! !! so it does conduct electricity but to a smaller extent and hence the light in the lamp glows dim :!)

hope it clarifies people doubts or else they can confirm that it was D from there respective teachers

Idk abt the methanol one.....D looked like a pretty good answer......sometimes the examiners themselves dnt include the bond between O and H...

And can someone PLEASE tell me the secret? How do u guys remember that, for example, Q37 was D and Q 15 was B etc etc (just using examples )

 

[madara]

pentane one was D , the forces of attraction always contribute to the boiling point !!..

while the methanol mcq was A !! it was also confirmed by the last question in p2 !! they asked for a FULL structure of methanol it was wrong as a bond between O-H was missing !! got it >? !!

yup the addition reaction was the bromine one D !!

for the people who are arguing over mercury , and the arguements they are making are pointless like it is a metal and very good conductor i can't help them !! Mercury is a fair conductor of electricity as it is a liquid it can't conduct it the way other metals do plus it is a weak electrolyte !! as u can find it everywhere when u search ! !! so it does conduct electricity but to a smaller extent and hence the light in the lamp glows dim :!)

hope it clarifies people doubts or else they can confirm that it was D from there respective teachers

dude....u seem smart.....so can u tell me how much marks will i get for the methanoic acid one....if i wrote eact it in air....with acidified potassium dichromate

 

[beeloooo]

Methanol was definitely correct - in my last 5 mins, I went through it again and again and I can assure you the structure was the very least correct.

H
I
H-C-OH
I
H

This is correct.

sure it is Doosh !! but they asked for a FULL structure !! got my words >?? FULL !! where is the O-H bond here ?? !! hope now u got it !!

 

[M Haseeb Javed]

pentane one was D , the forces of attraction always contribute to the boiling point !!..

while the methanol mcq was A !! it was also confirmed by the last question in p2 !! they asked for a FULL structure of methanol it was wrong as a bond between O-H was missing !! got it >? !!

yup the addition reaction was the bromine one D !!

for the people who are arguing over mercury , and the arguements they are making are pointless like it is a metal and very good conductor i can't help them !! Mercury is a fair conductor of electricity as it is a liquid it can't conduct it the way other metals do plus it is a weak electrolyte !! as u can find it everywhere when u search ! !! so it does conduct electricity but to a smaller extent and hence the light in the lamp glows dim :!)

hope it clarifies people doubts or else they can confirm that it was D from there respective teachers

Dnt u think that methanol is a covalent bonded substance n force of attraction refers to force between Ions.

 

[beeloooo]

dude....u seem smart.....so can u tell me how much marks will i get for the methanoic acid one....if i wrote eact it in air....with acidified potassium dichromate

thanku !! u might get 2 marks jus because of writing ACIDIFIED !! if the examiner takes it in account as acidic conditions

 

[IARK]

Dnt u think that methanol is a covalent bonded substance n force of attraction refers to force between Ions.

Dude, i think you mean PENTANE

 

[M Haseeb Javed]

Dude, i think you mean PENTANE

yah...

 

[beeloooo]

Dnt u think that methanol is a covalent bonded substance n force of attraction refers to force between Ions.

in covalent bonds electrons are shared ?? ryt ?? so there can be attractive forces between those and the nuclei can't it ?

 

[madara]

thanku !! u might get 2 marks jus because of writing ACIDIFIED !! if the examiner takes it in account as acidic conditions

ohhhh.......yeah thats wat i meant to say........so 1 mark for reaction in air.....and onw mark for acidic conditions ??

 

[M Haseeb Javed]

in covalent bonds electrons are shared ?? ryt ?? so there can be attractive forces between those and the nuclei can't it ?

SO why the Hell did they gave us a option for covalent bonds breaking ! ^ Avogadro Number .. Mr beeeloooo Mercury k sar par maat uroo....

 

[beeloooo]

yah...

http://en.wikipedia.org/wiki/Alkane



here u go !! scroll down and check whats written under the heading ''BOILING POINT '' !!

 

[beeloooo]

ohhhh.......yeah thats wat i meant to say........so 1 mark for reaction in air.....and onw mark for acidic conditions ??

one mark is for the reagent !! and one mark for acidic conditions !!

 

[UziB]

I also think the MCQ regarding pentane's boiling point was option B i.e more covalent bonds have to be broken. Since down the homologous series melting/boiling points increase -> since the number of bonds increases -> hence more heat energy is needed to break the bonds.
As far as the methanol MCQ is concerned, beeloooo is correct - the bond between OH was missing hence it was not the FULL structural bonding of methanol. Option A i.e it can be further oxidized to methanoic acid was the correct answer.

 

[beeloooo]

SO why the Hell did they gave us a option for covalent bonds breaking ! ^ Avogadro Number .. Mr beeeloooo Mercury k sar par maat uroo....

Dude im only answering when i am sure about something ! chill i think i have proved with that link that i was ryt !! *PEACE* !! about the pentane one !!

 

[Doosh Bag]

First two answers were A.
Then D, then B.
What was Q5? If it was about what sand is then macromolecule, A.

Anyone remember next ?

 

[M Haseeb Javed]

http://en.wikipedia.org/wiki/Alkane



here u go !! scroll down and check whats written under the heading ''BOILING POINT '' !!

See u on 13th August.. This chat is hopeless