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

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work_tgr
post Oct 26 2008, 06:10 PM

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QUOTE(-PatheticSoul- @ Oct 26 2008, 06:09 PM)
i wan to finish spm.but i dun wan to leave school.. xD
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sure you can do that. Just stay at school after SPM.
work_tgr
post Oct 27 2008, 08:56 AM

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I think A gua
work_tgr
post Oct 27 2008, 09:03 AM

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pH 1 is the measurement for strong acid.

For SPM, 0.1moldm^-3 is considered as strong acid
D could be right, but it is ethanoic acid (a week acid), even though its molarity is 0.1moldm^-3, its pH still higher than 1.

This post has been edited by work_tgr: Oct 27 2008, 09:04 AM
work_tgr
post Oct 27 2008, 09:10 AM

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QUOTE(vick5821 @ Oct 27 2008, 09:06 AM)
So, in SPM SYLLABUS, WEAK ACID impossible to have pH value less than 2?
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Not necessary.

There is no obvious statement to tell SPM students about what exactly makes the value of pH. Of course, it must be related with the content of OH- and H+.

So, week acid such as ethanoic acid of 0.1moldm^-3 could be higher than 1 because it doesn't dissociate completely.

But, if the molarity increase to 1moldm^-3 or higher, it could be pH1.

This post has been edited by work_tgr: Oct 27 2008, 09:12 AM
work_tgr
post Oct 27 2008, 09:16 AM

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QUOTE(vick5821 @ Oct 27 2008, 09:12 AM)
so if weak acid is concentrated, the ph value could be less than 1 la?
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yes, pH 1. But less than 1 ? hmm.gif
QUOTE(vick5821 @ Oct 27 2008, 09:12 AM)
how abt dilute sulphuric acid..ph 2?
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It's based on experiment and we can not tell by the concentration to get the exact value of pH. But, we can make a rough guess. pH2 is still under the group of concentrate acid.

This post has been edited by work_tgr: Oct 27 2008, 09:16 AM
work_tgr
post Oct 27 2008, 09:27 AM

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yes, C&D are alkali and B is better answer than A because pH of WEAK ETHANOIC ACID around 5 or 6.
work_tgr
post Oct 28 2008, 05:25 PM

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QUOTE(vick5821 @ Oct 28 2008, 04:13 PM)
another ques
A ballon is filled with gas at atm pressure. The ballon is then immersed into water until its volume is 1/16 of its original volume. what is the depth of the balloon from the surface of the water? ( atm pressure =10m of water)
A. 75m
B.80m
C. 150m
D. 160m

what made the car hydraulic brake system NOT EFFECTIVE if there is air bubble in the system?
A. When the brake is pressed, the air bubble is compressed
B. The air bubble will reduce the brake liquid pressure
C. The air bubble will expand when the brake is heated up
D. The air will flow out when the brake is pressed..

is it A?
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1. C
p1v1=p2v2
v2/v1=p1/p2=1/16
10/(p1+10)=1/16
p1=150m

2. A
no air in hydraulic system as air is compressive.
work_tgr
post Oct 28 2008, 08:42 PM

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Second thought, C is a possible answer too.
work_tgr
post Oct 30 2008, 02:36 PM

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QUOTE(HotChocolate @ Oct 30 2008, 02:30 PM)
P
=(0.7+0.2)(13600)(10)
=1.224x105

Am not good in this question, what's the answer?
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correct rclxms.gif
work_tgr
post Oct 30 2008, 02:40 PM

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x is at the bottom of the tube. at that point, the mercury pressure will also include the pressure from the mercury inside the tube.
ignore this ... I think it is not correct.

This post has been edited by work_tgr: Oct 30 2008, 02:43 PM
work_tgr
post Oct 30 2008, 02:42 PM

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-- but this question is tricky.
20cmHg might be correct and it depends on how your teacher interpret it.
"fight" for marks if you want.

This post has been edited by work_tgr: Oct 30 2008, 02:44 PM
work_tgr
post Oct 30 2008, 02:45 PM

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QUOTE(vick5821 @ Oct 30 2008, 02:44 PM)
but at the bottom also X..so just 20 cm ma
*
ya, see my correction.
just 1 mark only, donate it lah. tongue.gif
work_tgr
post Oct 30 2008, 02:58 PM

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Wouldn't die lah. 1 mark only. so kiasu meh ?
work_tgr
post Oct 30 2008, 03:12 PM

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QUOTE(vick5821 @ Oct 30 2008, 03:00 PM)
i wan is fact..i also kia su..it just said mercury la...so confuse me..i changed it from 90 cm Hg to 20cm Hg...i wan learn thing la.
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In that case, your teacher has the ultimate power to give exam marks. Your answer is correct.
work_tgr
post Oct 30 2008, 04:52 PM

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QUOTE(vick5821 @ Oct 30 2008, 04:33 PM)
if my teacher give me wrong?
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Argue till the hell ... screw him or be screwed tongue.gif
--
As I say, just donate that 1 mark lah ... Tuhan tau you r right
work_tgr
post Oct 30 2008, 06:22 PM

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1. 10/4=2.5m/s
2. 340x5=1700m
work_tgr
post Oct 30 2008, 08:34 PM

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QUOTE(pwincess @ Oct 30 2008, 07:47 PM)
i duno this ques. help me.

When a footballer kicks a ball which is at rest, a force of 20N is applied in 0.5 s. The impulse that is given to the ball is ?
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Fxs=impulse=20*0.5=10Ns
work_tgr
post Oct 30 2008, 09:13 PM

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Q. 17, find out the tension of string for both M and m
Msin30=msin45
M/m=sin45/sin30
work_tgr
post Oct 31 2008, 07:41 AM

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QUOTE(HotChocolate @ Oct 31 2008, 01:55 AM)
I got 7k Pa.
P
=hpg
=0.7(1000)(10)
=7000 Pa

How did it get cut down to 6860.
Anyone clarify it?
*
it uses 9.8
work_tgr
post Oct 31 2008, 10:18 AM

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QUOTE(purplearch @ Oct 31 2008, 10:07 AM)
guys, tips to study bio ?
i study, but sometimes facts tends to slip off my mind, esp when sucess is so thick
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good luck. all these should be done through continuous study+revision.
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