yeah exactly i did the same as you =)
so i assume that the scheme is wrong?or our mistake T.T

lol i got -8<p<8 as well

just wanna ask you guys...how to wrote a good karangan actually?i mean the steps?any guide?what type of penanda wancana you all using?

you should also include some simpulan bahasa/ peribahasa to your karangan.
i will post the guide to write a good karangan tomorrow

when ice melt into liquid ,
volume increase or decrease , density increase or decrease

density increase, volume decrease

why?

because ice floats on water.

but the answer given is volume increase , density decrease .. from the times physic

i know why d , when ice > water , temperature increase ... charles law= volume increase , volume is inversely proportional to density

This post has been edited by customer2: Nov 20 2010, 01:05 AM

empty spaces within the ice structure, as this translates to a more open or expanded structure. The ice structure takes up more volume than the liquid water molecules, hence ice is less dense than liquid water.

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Added on November 20, 2010, 1:07 amhttp://www.elmhurst.edu/~chm/vchembook/122Adensityice.html

This post has been edited by jyhy: Nov 20 2010, 01:07 AM

20.D
21.B

mind explain?

is the answer correct?
20. use boyle's law. p1v1=p2v2
10x3V=(10+h)xV
can you continue the rest?

21. A thermocouple is a junction between two different metals that produces a voltage related to a temperature difference. from wiki

anyone can pm me sej tips?? dun really think can finish study b4 SPM for sej
seeing from my mid year got A- drop to C+(59) during trials really scare me la

anyway im prepared for ADD MATHS!!!!

correct, volume increase density decrease

now u have to understand the concept of density. Density is the mass per unit volume. That is how u derive

p= M/V

So now u have ur ice. The particle are closely compacted together. So the amount of particle squeezing together is higher. When it reaches its melting point, the heat supplied is used to break the bonds between H20 molecules. (not the covalent bond of H20 but the intermolecular forces). Now it is a liquid where the particle arrangement is looser than of in solid. Mass is the amount of particle in an object, so it remain constant given the fact that it is not evaporated. So Mass is constant. But the volume increase. This is because of the looser arrangement of H20 particle. So they are more spread out.

For an example, get a few ping pong balls and a cubical. Arrange them in mannerly order like in solid. Measure the length and width. Now spread the balls like the molecule in liquid. U will notice an increase of space used.
In this case, the operation functional of volume is the space used.

Then we look back into density

p=M/V

So when the Mass is a constant, the relationship of P and V is inversely proportional

its like

P=M(1/V) where M is constant.

So as Volume increases, density decreases.



Addons: Yes, charles law is basicly the heat used(temp increase) to break the bonds between molecules causing it to be more spread out. So its volume is higher. So V=kT. When derive k in term of V and T, u will get V/T. To cut thing short, heat increase, volume increase.

This post has been edited by IcyDarling: Nov 20 2010, 08:27 AM

Whoaaa Smart-nya

google lar

Cheh.. I thought u going out to help ur mom?

wat cheh cheh all... i act humble only lorr/. cant find those anywhere on the net Tommy's law of density? XD


Help help half way lurk here. Then continue lorhh