Biology; Chemistry; Physics: Post your doubts here!

[rabiafarooq101]

http://www.cambridgestudents.org.uk...hecklist_for_O_Level_Chemistry_5070_FINAL.pdf


here check it

 

[asd]

option A right ans

option D is wrong because sometime carbons of diamon make a new diamond by reacting with other element like Na (google it with yellow diamond )

thats wat ithink might any body else have better explanation !!

I thought in graphite not only covalent compounds are involved but Van der Waals forces between the layers are also there. So D is therefore not possible.

 

[rabiafarooq101]

vaanderwals ??

weak forces of attraction

 

[a.abid]

weak forces of attraction

hey can u explain it again....

 

[kitecrystal]

weak forces of attraction

ohk!jazakAllah

 

[A star]

hey can u explain it again....

weak forces between layers of graphite and molecules of simple covalent compounds.break down on gentle heating

 

[A star]

hey can u explain it again....

hope i can help.

 

[a.abid]

weak forces between layers of graphite and molecules of simple covalent compounds.break down on gentle heating

ohkay thanx so graphite is not a covalent compound?

 

[asd]

ohkay thanx so graphite is not a covalent compound?

It IS. Just that it also has van der waals

 

[daredevil]

hey can u explain it again....

graphite structure:
Carbon atoms are bonded to other carbon atoms. (i think its bonded with 3 other C atoms)
then 1 whole layer of such bnding is connected to the layer above it by WEEK VAN DER WAAL'S forces. these forces are responsible for the unique properties of graphite. means it is used as a lubricant b/c these WEEK forces allow the layers to slide over each other making it slippery. got it??

 

[A star]

ohkay thanx so graphite is not a covalent compound?

i said between molecules of covalent compounds . hope it makes it moe prominent

 

[a.abid]

graphite structure:
Carbon atoms are bonded to other carbon atoms. (i think its bonded with 3 other C atoms)
then 1 whole layer of such bnding is connected to the layer above it by WEEK VAN DER WAAL'S forces. these forces are responsible for the unique properties of graphite. means it is used as a lubricant b/c these WEEK forces allow the layers to slide over each other making it slippery. got it??

It IS. Just that it also has van der waals

yes thankyou both

 

[MustafaMotani]

mcq 1 Plx

 

[a.abid]

i said between molecules of covalent compounds . hope it makes it moe prominent

lol it was thanx

 

[multixamza01]

How can we liberate Ammonia from ammounium compounds?

 

[A star]

B

mcq 1 Plx

 

[a.abid]

How can we liberate Ammonia from ammounium compounds?

reaction with alkali/base.... i guess

 

[MustafaMotani]

How can we liberate Ammonia from ammounium compounds?

react it with alkalis

 

[MustafaMotani]

B

LOl no its D nitrogen
I would have never guessd

 

[A star]

then warm mixture