is it acid and base?

oh. salts. its quite easy if u memorize all of em.
which part u din understand?

im confused~
do this question.

tha answer is A

i dont know.
i cant figure out why the answer is A

thats why. i get it from pelangi book

the answer is D

help me with these 2 question.

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

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

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

oh. ic. if it wants total work done then 600x50.
if work done against friction is 1000x50.
i understand now. thx

phy ques..

no 15 pls !

A piece of stone weighing 600 g at 28 degree celcius is put into a beaker which contain 1.2 kg of water at 50 degree celcius. calculate the final temperature of the water and the stone.
(Specific heat capacity=4200, specific heat capacity of stone=840)

ur ans is correct but how did u get 1.2x4200x(50-T)
why not T-50 ?
bcoz it asked for the stone final temperature. im confused

ohh.the water will cool the stone, so thats why its final temperature is T>28. i get it now. thank u !

got admaths question that needs to be solved.

The velocity, v of a particle which moves along a straight line, t seconds after passing a fixed point O, is given by v=10t-3t²+8. Find the interval from the instant the particle starts until it is instantaneously at rest.

yep. how did u do it?
can u show the calculation ?

i c. thx for the explaination ! ;D

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Added on November 3, 2008, 2:29 pmbtw, how to score high marks on bm and english essay ?

This post has been edited by pwincess: Nov 3 2008, 02:29 PM