Author Topic: CHEM AND BIO HELP AND TIPS HERE  (Read 353720 times)

Offline Ghost Of Highbury

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2085 on: May 24, 2010, 08:39:00 pm »
Aadi .. always one step ahead :) .. hey can u tell me how can i been more confidant about my answers ?? like this one for instance ..

when i am confidant the answers go wrong .. :\

The only way you can be confident about your answers if you have all your concepts in the right place. Try to read that IGCSE chem. guide b4 sleeping, thats nuff. YOu dont need tips dude, ur awesome, and im sure ull get  that star in chem ;)

@deadman - Typical volumes are 10, 25, and 50 mL. Alternatively, graduated pipettes are straight-walled, and graduated for different volumes such as 5 mL in 0.5 mL increments.
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Offline The Golden Girl =D

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2086 on: May 24, 2010, 08:41:42 pm »
The only way you can be confident about your answers if you have all your concepts in the right place. Try to read that IGCSE chem. guide b4 sleeping, thats nuff. YOu dont need tips dude, ur awesome, and im sure ull get  that star in chem ;)

@deadman - Typical volumes are 10, 25, and 50 mL. Alternatively, graduated pipettes are straight-walled, and graduated for different volumes such as 5 mL in 0.5 mL increments.

i read what u wrote  ::) ::) and i'm just wondering can u give me the link  ::)
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Offline Ghost Of Highbury

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2087 on: May 24, 2010, 08:43:19 pm »
i read what u wrote  ::) ::) and i'm just wondering can u give me the link  ::)

what link?
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Offline The Golden Girl =D

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2088 on: May 24, 2010, 08:43:48 pm »
what link?

to the IGCSE chem guide thingy
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Offline Ghost Of Highbury

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2089 on: May 24, 2010, 08:46:01 pm »
to the IGCSE chem guide thingy

its a book
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Offline Vin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2090 on: May 24, 2010, 08:46:08 pm »
Thanks Aadi .. r u talking about this guide ?? I still hav to do French .. havnt touched it since morning !

Offline Vin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2091 on: May 24, 2010, 08:47:26 pm »
its a book


Oh tht ! tht is more than enough .. sad i dont hav the whole book. :\ jus a couple of pages photocopies ..

Offline the_grim_reaper

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2092 on: May 24, 2010, 08:49:42 pm »
typical ones in a lab 10, 25, and 50 ml. (at least in my school lab) y do you ask ??

Thanks a lot. No nothing really. Just random stuff :P.

Offline Vin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2093 on: May 24, 2010, 08:52:35 pm »
Thanks a lot. No nothing really. Just random stuff :P.


oh ok .. there is something known as teat pipette .. or dropper .. which is smaller and less accurate than a pipette ;) you obvi. might know this ..:)

Offline Helium

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2094 on: May 24, 2010, 08:58:25 pm »
 Some body prove it's A.(plz)

It's unsaturated because it has a double bond, but why form neutral solution
in water. It has OH group which is alcohols.
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Offline NidZ- Hero

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2095 on: May 24, 2010, 08:59:58 pm »
Thanks Aadi .. r u talking about this guide ?? I still hav to do French .. havnt touched it since morning !
hey vin dude do u have de guide

Offline the_grim_reaper

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2096 on: May 24, 2010, 09:02:06 pm »
oh ok .. there is something known as teat pipette .. or dropper .. which is smaller and less accurate than a pipette ;) you obvi. might know this ..:)

hahaha I do know this. It's the stuff we use to mess around with the lab's chemicals when the teacher is busy ;D..

Just one final thing (really sorry to disturb today), in oct/nov 01 in question 13, why is it not A (P only)???

Offline Vin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2097 on: May 24, 2010, 09:07:25 pm »
Some body prove it's A.(plz)

It's unsaturated because it has a double bond, but why form neutral solution
in water. It has OH group which is alcohols.


O/N 2003 CHEM P1 , Q36!
Which compound is unsaturated and forms a neutral solution in water?

A) CH2OH-CH--CH-CH2OH
B) CH2OH-CH2-CH2-CH2OH
C) CO2H-CH--CH-CO2H
D) CO2H-CH2-CH2-CO2H

i get the unsaturated bit.. but how do you know if it's neutral or not?
doesnt the 'OH' group make it ... acidic? :B hehs, explanation neeeeeded svp, (X
 :P

answer is A .. why because C doesnt make sense to me ! also OH is alcohol and COOH is acid


looooool - uhh but howd you know that alcohols can form neutral solutions in water?  :(

It is supposed to be neutral .. in fact red litmus paper has an ingredient called "alcohol" .. thts a long story now .. google it if u wanna 

Offline Helium

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2098 on: May 24, 2010, 09:10:14 pm »
hahaha I do know this. It's the stuff we use to mess around with the lab's chemicals when the teacher is busy ;D..

Just one final thing (really sorry to disturb today), in oct/nov 01 in question 13, why is it not A (P only)???

lol same here, our students act like 9 year old, take the syringes and start spraying water at
each other.

Are u sure the anw is A.
Q)which Group 7 element is produced at which anode.

1 solution has Molten lead(II) bromide. Bromine gas produced at P.

2 solution concentrated hydrochloric acid. Chlorine is supposed to be formed at R.

I think it should be B (P and R)

Or chloride ions dont move in concentrated solutions
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Offline Vin

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