How was Chemistry P1/2

[maaz007]

yr Structure was exactly correct refer wikipedia same structure is shown!

 

[MustafaMotani]

Hey,, In paper 2, section A what was the least thermally stable carbonate? Copper or magnesium?

I wrote coppEr.. :S

 

[pakisatan123]

I wrote coppEr.. :S

i think it was magnesium as it lost more mass

 

[MustafaMotani]

i think it was magnesium as it lost more mass

that thoght came to me but then it was written that thermal stability depends upon reactivity!
moreover magnesium's mass was less than copper in 2gm (CALculate mass by dividing Mr of cabonate wid 2 gms and multiplying it wid metal's Ar) so I took that for granted that it lost more mass because prcentage of magnesium was less than that much carbonate of copper, therefor less was left.
I dont know my ans is ryt or not I assumed most

 

[AliMahad]

no....the structure did not show the O-H bond so it wasn't correct......answer was A

It did very well show O H bond. I vividly remember circling this part with a pencil.

 

[asd]

It did very well show O H bond. I vividly remember circling this part with a pencil.

Dude i did the same mistake, It wasn't shown there It was like --OH.

 

[maaz007]

No where i have seen that a bond b/w OH is necessary as its a complete fucntional group!

 

[MustafaMotani]

what do you mean by --OH ??
asd

 

[maaz007]

Methanol to Methanoic acid is not just oxidation but differnt catalytic processes!

 

[MustafaMotani]

Methanol to Methanoic acid is not just oxidation but differnt catalytic processes!

those processes can be simply termed as oxidation of methanol I surfed the internet

 

[maryam fatima]

ummmmmmmmm i dnt think so that paper was tough it was ............................ ok!

 

[maryam fatima]

pathetic pathetic pathetic...!! :'( mera tow ro ro k bura haal ho gya hai..

why?????????? there's no need of crying. chemistry apna sbject hai bkwas b likho tou atleat A aa hi jata hai

 

[Scarlet Flame]

why?????????? there's no need of crying. chemistry apna sbject hai bkwas b likho tou atleat A aa hi jata hai

chemistry aapka sub ho ga meray se tow bilkul wo dil nahi lagata.. naa hi apnahiyat mehsoos honay deta hai dash.. apni trf se bakwas hi bakwas likhi hai..:/

 

[Monojit Saha]

that thoght came to me but then it was written that thermal stability depends upon reactivity!
moreover magnesium's mass was less than copper in 2gm (CALculate mass by dividing Mr of cabonate wid 2 gms and multiplying it wid metal's Ar) so I took that for granted that it lost more mass because prcentage of magnesium was less than that much carbonate of copper, therefor less was left.
I dont know my ans is ryt or not I assumed most

I wrote magnesium, i think ur explanation is OK.. but still have some doubts

 

[plantaholic]

I wrote coppEr.. :S

what was the full question? can you guys tell me other parts.. i cant recall it.. and its making me scared

 

[ISFSAT]

Well Copper carbonate was the least stable.......answer for mass part was that they all have differnet number of moles with 2 g , so differnet mass of Co2 was released
And, the ionic was bit complicated, I dont remember it ryte now
For the prepartaion of copper chloride, which was a soluble salt, i wrote" take excess amount of copper carbonate and mix it with dilute sulphuric acid( i guess these were the starting materials given ryte?). FILTER out excess copper carnbonate and evapourate the filtrate to the crystallization point. allow to cool and wash with water and then dry with filter paper"
Hope it helped

did the same..... i dnt know why people are saying that magnesium carbonate was the least stable...actually magnesium carbonate was the most stable...........

 

[bogus]

did the same..... i dnt know why people are saying that magnesium carbonate was the least stable...actually magnesium carbonate was the most stable...........

table said so aur waisay bhi reactivity series ... its copper. how on earth is it magnesium? any proof?

 

[silver slick]

did the same..... i dnt know why people are saying that magnesium carbonate was the least stable...actually magnesium carbonate was the most stable...........

Hey do you know how much mark this question WAS, i completely forgotten this question even though I ATTEMPTED THAT!!

 

[MustafaMotani]

what was the full question? can you guys tell me other parts.. i cant recall it.. and its making me scared

it was that thermal stability depends over reacitvity. Which carbonate is least stable

 

[MustafaMotani]

did the same..... i dnt know why people are saying that magnesium carbonate was the least stable...actually magnesium carbonate was the most stable...........

its not magnesium , sodium was most stable