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Author Topic: CHEM AND BIO HELP AND TIPS HERE  (Read 351118 times)

Offline MasterMath

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2745 on: June 06, 2010, 10:28:21 am »
Quote from: Ari Ben Canaan on June 06, 2010, 10:25:09 am
No, no. :D Why would I be angry ?

Just saying, I have done all P3's from 1990 to 2009. AND I FEEL GOOOOOOOOD ! :P
If you dont get A* .. I KILL YOUUUU :D
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Offline farahkuwait

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2746 on: June 06, 2010, 10:28:53 am »
CHEMI HELP PLEASE

November 2002 Q1(a)(ii)

I dont get this thing because i just dont inderstand what yield means and the whole idea,, PLEASE HLEP

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elemis

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2747 on: June 06, 2010, 10:31:07 am »
Quote from: MasterMath on June 06, 2010, 10:28:21 am
If you dont get A* .. I KILL YOUUUU :D

Believe me I will.

Quote from: Kimo Jesus on June 06, 2010, 10:28:02 am
wow man respect !:P

My future depends on that chem exam. I cant mess up.
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Offline igext

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2748 on: June 06, 2010, 10:31:49 am »
Quote from: Ari Ben Canaan on June 06, 2010, 10:21:13 am


LIKE ME !!!!!!!!!!!!!!!!
are we required to know the molecular structures of fats, glycerol, fatty acids , soap compounds? how about the symbol formula (molecular)?
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Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2749 on: June 06, 2010, 10:32:25 am »
Quote from: farahkuwait on June 06, 2010, 10:28:53 am
CHEMI HELP PLEASE

November 2002 Q1(a)(ii)

I dont get this thing because i just dont inderstand what yield means and the whole idea,, PLEASE HLEP


GO STUDY EQUILIBRIUM !

since the forward reaction is exothermic , if you increase the temperature ! equilbibrium will want to decrease the temperature ! ( it does the opposite of what u want ) and to decrease the the temperature , it moves in the endothermic direction  ( opposite to the exothermic dircetion )  so equilibrium moves from right to left  and so onow equilibrium is in the REACTANT SIDE AND SO  reactants yield = amount , incrase and producti decrease , because its equilibrium if one increase the other has to decrease
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NO secrets to SUCCESS , it is the result of 1.HARD WORK 2.GOOD PREPARATION 3.LEARNING FROM FAILURE
But it ain't how hard you hit; it's about how hard you can get hit, and keep moving forward-Balboa

elemis

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2750 on: June 06, 2010, 10:33:06 am »
Quote from: igext on June 06, 2010, 10:31:49 am
are we required to know the molecular structures of fats, glycerol, fatty acids , soap compounds? how about the symbol formula (molecular)?


NO !!! Just the names and products of hydrolysis.
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Offline MasterMath

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2751 on: June 06, 2010, 10:33:16 am »
Quote from: Ari Ben Canaan on June 06, 2010, 10:31:07 am
Believe me I will.

My future depends on that chem exam. I cant mess up.
Well lets see , ima get top of the world ;)
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Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2752 on: June 06, 2010, 10:33:32 am »
Quote from: Ari Ben Canaan on June 06, 2010, 10:31:07 am
Believe me I will.

My future depends on that chem exam. I cant mess up.
u did good in p1 and p6?
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NO secrets to SUCCESS , it is the result of 1.HARD WORK 2.GOOD PREPARATION 3.LEARNING FROM FAILURE
But it ain't how hard you hit; it's about how hard you can get hit, and keep moving forward-Balboa

Offline igext

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2753 on: June 06, 2010, 10:35:00 am »
Quote from: Ari Ben Canaan on June 06, 2010, 10:33:06 am
NO !!! Just the names and products of hydrolysis.
Amazing :P  so not even the formulas ??
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Offline farahkuwait

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2754 on: June 06, 2010, 10:36:55 am »
Quote from: Kimo Jesus on June 06, 2010, 10:32:25 am
GO STUDY EQUILIBRIUM !

since the forward reaction is exothermic , if you increase the temperature ! equilbibrium will want to decrease the temperature ! ( it does the opposite of what u want ) and to decrease the the temperature , it moves in the endothermic direction  ( opposite to the exothermic dircetion )  so equilibrium moves from right to left  and so onow equilibrium is in the REACTANT SIDE AND SO  reactants yield = amount , incrase and producti decrease , because its equilibrium if one increase the other has to decrease

Im sorry i just dont get why the yield increses when equilibrium shifts from right to left.. will you please explain.
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Offline Deniz

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2755 on: June 06, 2010, 10:37:38 am »
can u pls write the catalyst that we should know for paper3 ?
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Offline MasterMath

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2756 on: June 06, 2010, 10:40:05 am »
Quote from: Deniz on June 06, 2010, 10:37:38 am
can u pls write the catalyst that we should know for paper3 ?
Finely divided iron for HABER PROCESS 450C 200 atm
Vanadium(V)Oxide for Contact process 450C 2atm
For cracking Alkanes - Al2O3/SiO2 and 500C and 10-12 atm
thats all i can remember now maybe im missing some reactions!
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Offline luv3life

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2757 on: June 06, 2010, 10:40:55 am »
Guys, any help/tips for Chemistry Paper 3? I'm not at all well-prepared. I'm talking about notes, etc.
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:) LiVe LiFe As If EaCh DaY mAy Be YoUr LaSt :)

Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2758 on: June 06, 2010, 10:41:21 am »
Quote from: farahkuwait on June 06, 2010, 10:36:55 am
Im sorry i just dont get why the yield increses when equilibrium shifts from right to left.. will you please explain.
look , right now the forward reaciton is exothermic , so imagine u are heating so u are producing more of teh S03

so wherever equilibrium is , the side , reactants or products INCREASE ! , right now it is hight temp and so u go to exothermic direction and so equilbrium is at the RIGHT

but now if u decrese the temp  that means you are cooling that means u are movin in the endothermic direction to cool

so from left to right
get it?



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NO secrets to SUCCESS , it is the result of 1.HARD WORK 2.GOOD PREPARATION 3.LEARNING FROM FAILURE
But it ain't how hard you hit; it's about how hard you can get hit, and keep moving forward-Balboa

Offline Deniz

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2759 on: June 06, 2010, 10:42:06 am »
Quote from: MasterMath on June 06, 2010, 10:40:05 am
Finely divided iron for HABER PROCESS 450C 200 atm
Vanadium(V)Oxide for Contact process 450C 2atm
For cracking Alkanes - Al2O3/SiO2 and 500C and 10-12 atm
thats all i can remember now maybe im missing some reactions!

thx. if u remember more can u pls write again ?
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