Hey guys ! why edu.joshuatly download link become like this adi ???

pls tell me how to fix it i wan to download them asap


Attached thumbnail(s)

must register before u can download all the paper

I logged in already but still the same

fuyoh...pro....

not so..i also ask from u all sometimes

no problem in my comp...

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Added on October 31, 2008, 11:06 pmwho hav kl trial exam spm paper?

This post has been edited by adrian7386: Oct 31 2008, 11:06 PM

got a chem ques here

Which of the following salts can be prepared by the reaction of an acid with a metal.?
A Potassium chloride
B. Copper (II) sulphate
C. Lead (II) iodide
D Magnesium nitrate

the answer is D

Either A or D.

help me with these 2 question.

why D?? the ans is D

p/s..your ques 25 E? 21 D?

This post has been edited by vick5821: Nov 1 2008, 12:26 PM

Erm, i think is D, correct?
because for A, we cant use reactive metal like Potassium to react with acid because explosion will happen.
for B, copper metal do not react with acid cos it is located lower than H in ECS.
for C, this is insoluble salt, must use double decomposition method(mix soluble salt contain cation and another soluble salt contain anion }
for D, Mg can react with nitric acid.
please correct me if im wrong.

This post has been edited by nicoleycc: Nov 1 2008, 12:27 PM

like work_tgr said, the answer is either A or D.
if A, K + HCL -> KCL +H2
if D, Mg + HNO3 -> Mg(NO3)2 + H2

*both of the equation is not balanced

any metal located below H cant react with acid?

1000x50=50000J

333/90=3.7

not 1600 X 50?

yes. bcoz hydrogen is more reactive then the metal that is located below H.

It said work to overcome "friction".

yea lo..btw, what is the ans?

why 1000x50?
not 600x50?

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Added on November 1, 2008, 12:30 pmthe answer is as u stated just now.
25E 21D

This post has been edited by pwincess: Nov 1 2008, 12:30 PM