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 SPM Thread 08/09 (V 3), SPM is coming soon..!!!! Final days..!!

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work_tgr
post Nov 8 2008, 10:33 PM

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QUOTE(vick5821 @ Nov 8 2008, 10:31 PM)
but u see this..BaCO3 + H2SO4 --> BaSO4 + CO2 + H2O.....

BaSO4 is insoluble salt wor
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that's why I said, the question is asking you about which one can dissolve BaCO3 and it doesn't necessary the product be in soluble state.
my opinion lah
work_tgr
post Nov 8 2008, 10:36 PM

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QUOTE(raptor_cZn @ Nov 8 2008, 10:33 PM)
Add sodium chloride which will cause a displacement reaction.
BaCO3+2NaCl-->BaCl2+Na2CO3
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Displacement ? I think that happens only when add in reactive metal to a solution.
--
Your equation is more to double decomposition and it only happens between two soluble salts

This post has been edited by work_tgr: Nov 8 2008, 10:37 PM
work_tgr
post Nov 8 2008, 10:37 PM

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QUOTE(Chan320 @ Nov 8 2008, 10:36 PM)
Haha.....got any tips on dun panic?
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be confidence
work_tgr
post Nov 8 2008, 10:39 PM

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QUOTE(vick5821 @ Nov 8 2008, 10:37 PM)
so how?? dun confuse me pls
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answer is what leh ?
work_tgr
post Nov 8 2008, 10:39 PM

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QUOTE(gzavincent @ Nov 8 2008, 10:38 PM)
From what i noe displacement must add in a more electropositive metal..
Like a zinc metal..It cant be in solution..
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agree
work_tgr
post Nov 8 2008, 10:40 PM

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QUOTE(vick5821 @ Nov 8 2008, 10:39 PM)
book and is D..but how to get de?
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we r almost there actually.
start to think from BaCO3 + H2SO4
work_tgr
post Nov 8 2008, 10:42 PM

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Just look again the sentence "The salt produced can be dissolaved by adding?"
It means what ?
work_tgr
post Nov 8 2008, 10:43 PM

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QUOTE(work_tgr @ Nov 8 2008, 10:42 PM)
Just look again the sentence "The salt produced can be dissolaved by adding?"
It means what ?
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Another word, "BaCO3 produced can be dissolved by adding ?"

Added on November 8, 2008, 10:44 pm
QUOTE(vick5821 @ Nov 8 2008, 10:42 PM)
from what i understood..it mean that the salt produced later must be a soluble salt
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really ?
That wasn't my understanding.
For me, it means which one can dissolve BaCO3

This post has been edited by work_tgr: Nov 8 2008, 10:44 PM
work_tgr
post Nov 8 2008, 10:45 PM

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QUOTE(vick5821 @ Nov 8 2008, 10:45 PM)
tis mean what?
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this means only acid lah ... and it doesn't mean the products must be in solution.

This post has been edited by work_tgr: Nov 8 2008, 10:47 PM
work_tgr
post Nov 8 2008, 10:46 PM

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QUOTE(gzavincent @ Nov 8 2008, 10:45 PM)
Y it is just soluble in HNO3 or HCl?
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I think that statement is under the properties of sulphate salt.
work_tgr
post Nov 8 2008, 10:49 PM

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QUOTE(vick5821 @ Nov 8 2008, 10:47 PM)
so confuse lah..so how i do tis ques..? see what?
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Maybe you can try to find out how BaCO3 react with item A, B, C ?
work_tgr
post Nov 8 2008, 10:50 PM

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QUOTE(HotChocolate @ Nov 8 2008, 10:49 PM)
That's why I said, only acid is able to remove carbonate ions.
Regardless, the question set is not good, that's all I can say.

Displacement reaction will be a metal replacing a solution of a metal salt.
Eg : Mg + CuSO4 -> MgSO4 + Cu
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Yeah. Good final conclusion.
work_tgr
post Nov 8 2008, 10:54 PM

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QUOTE(raptor_cZn @ Nov 8 2008, 10:52 PM)
If they want to get a soluble salt this is the reaction

Ba(Cl)2(aq) + Na2CO3(aq) = 2NaCl(aq) + BaCO3(aq)
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How come the reactants is Ba(Cl)2(aq) + Na2CO3(aq) ?
This question's reactant is BaCO3
work_tgr
post Nov 8 2008, 10:55 PM

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QUOTE(raptor_cZn @ Nov 8 2008, 10:54 PM)
The eqn terbalik

But when you add barium carbonate to sodium chloride, you should get sodium carbonate and barium chloride
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you sure boh ? this is not a reverse chemical equation
work_tgr
post Nov 8 2008, 10:58 PM

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and ..."the residue is a brown solid when hot and yellow solid when cold" shows it is Pb

Added on November 8, 2008, 10:59 pm
QUOTE(vick5821 @ Nov 8 2008, 10:58 PM)
why B cant?
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no Nitrogen leh

This post has been edited by work_tgr: Nov 8 2008, 10:59 PM
work_tgr
post Nov 8 2008, 11:01 PM

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QUOTE(vick5821 @ Nov 8 2008, 10:59 PM)
tis is lead (II) oxide?
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yes. My bad.
work_tgr
post Nov 8 2008, 11:01 PM

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QUOTE(HotChocolate @ Nov 8 2008, 11:00 PM)
It applies to all Lead (II) xxxx solid.
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I think ... not really. E.g PbCO3 when heated it will release CO2
work_tgr
post Nov 8 2008, 11:04 PM

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QUOTE(vick5821 @ Nov 8 2008, 10:54 PM)
substances T, when heated in air, produces a brown gas that turn blue litmus paper red. The residue is a brown solid when hot and yellow solid when cold. Substances T may be
A. zinc carbonate
B. lead (II) carbonate
C. zinc nitrate
D. lead (II) nitrate
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No lah ... reactant lah.
work_tgr
post Nov 8 2008, 11:05 PM

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QUOTE(raptor_cZn @ Nov 8 2008, 11:04 PM)
Wrong one zinc oxide is yellow when hot, white when cool
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LOL! you really need to sleep. tongue.gif
work_tgr
post Nov 8 2008, 11:08 PM

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alright and whatever lah ... good night.
good luck to SPM students. Be confidence and pray.

chow to sleep now. smile.gif
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