Chemistry: Post your doubts here!

[hihi]

Once you find a carbon atom that is connected to four groups different from each other, that carbon atom is a chiral centre.
Carbon connected to only three or even two groups cannot be a chiral centre.
In a moderately complex molecule, there could be more than one chiral centre. [/
Does it have to do anything with d+ and d- ...
and when calculating enthaply change for example in reaction : Ca(s) + 2H2O(l) = Ca(OH)2 (aq) + H2 (g) and u r given Q, which moles do u take from Ca or H2O ?? Thanks so much

 

[hihi]

Does it have to do anything with d+ and d- ...
and when calculating enthaply change for example in reaction : Ca(s) + 2H2O(l) = Ca(OH)2 (aq) + H2 (g) and u r given Q, which moles do u take from Ca or H2O ?? Thanks so much

 

[saudha]

anybody wht r the kinetic theory of ideal gases?

 

[lavanyamane]

http://www.xtremepapers.com/papers/... AS Level/Chemistry (9701)/9701_w10_qp_22.pdf
Could somebody please explain Q.1(c) to me? I'm completely lost and my exam is in 9 hours! :S

 

[perkypearl]

what is mineral acid ? :S

 

[shan5674]

what is mineral acid ? :S

H2SO4 - mineral acid
NaOH - mineral alkalie

I dont know the exact definition of mineral acid but my book states the above acids as "mineral" during reactions.

 

[MysteRyGiRl]

^mayb with hydrogen?

 

[Saad (سعد)]

what is mineral acid ? :S

An acid that has a mineral bonded to a hydrogen. Like H2SO4 (sulfate is a mineral, hence sulfuric acid is a mineral acid); or HCl (chloride is a mineral, hence HCl is a mineral acid) and HNO3 (nitrate is a mineral, hence nitric acid is a mineral acid).

But that's not the actual definition, just my understanding. The actual definition is; 'A mineral acid (or inorganic acid) is an acid derived from one or more inorganic compounds.'

Hope that helps insha'Allah!

 

[MysteRyGiRl]

An acid that has a mineral bonded to a hydrogen. Like H2SO4 (sulfate is a mineral, hence sulfuric acid is a mineral acid); or HCl (chloride is a mineral, hence HCl is a mineral acid) and HNO3 (nitrate is a mineral, hence nitric acid is a mineral acid).

But that's not the actual definition, just my understanding. The actual definition is; 'A mineral acid (or inorganic acid) is an acid derived from one or more inorganic compounds.'

Hope that helps insha'Allah!

yaay was ryt

 

[shan5674]

http://www.xtremepapers.com/papers/... AS Level/Chemistry (9701)/9701_s11_qp_22.pdf

Can someone pls help me with Q1-b(ii)&(iv) and C(i)

 

[MysteRyGiRl]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s11_qp_22.pdf

Can someone pls help me with Q1-b(ii)&(iv) and C(i)

da answers r given above

 

[Most_UniQue]

How was chem p 22? It was easy and there was 4 questions instead of 5!

 

[busy bee]

did u give p5?

 

[Jaf]

Someone in the thread that got closed said that Chlorides do not undergo disproportionation in water and that only happens with NaOH. The former is true, but the latter is not.

Chlorides undergo hydrolysis in water. Chlorine (not chloride), on the other hand undergoes disproportionation in hot alkali, cold alkali as well as water.

Good luck everyone who hasn't given their exam yet!

 

[Pranav Kalia]

stuck on enthalpy cycles and shapes of bonds and molecules

 

[arkif rizan]

wat is the A grade for the whole exam out of 270??

 

[saudha]

hw was p5 an p2 guyzz?
i liked both of it
p5 was lengthy,and p2 was short

 

[hassam]

wat to study for design and materials chapter

 

[hassam]

wat was ms definition of complex ion....i dun remember the paper at the moment

 

[DragonCub]

wat was ms definition of complex ion....i dun remember the paper at the moment

Maybe molecular ion formed by metal cation bound to ligands? That's my own words...