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Author Topic: CHEM AND BIO HELP AND TIPS HERE  (Read 355007 times)

nid404

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #915 on: May 17, 2010, 06:52:01 am »
haha..not a problem mate
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Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #916 on: May 17, 2010, 06:53:26 am »
Quote from: Deniz on May 17, 2010, 06:48:29 am
Can some1 help me pls?
the question says that "A sample of orange fruit jam was investigated to check the three colourings preesnt.
Step 1 = the jam was boiled with water"
the question asks the purpose of step 1?
could u please explain me clearly the purpose of it?

LOL this is may june 2006!>im doin the same past paper right now


well i wrote to dissolve the colours..
mark scheme says to EXTRACT THE COLOURS... Boil it and it dissolves :/ cant explain more than that
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Offline Vin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #917 on: May 17, 2010, 07:02:55 am »
Quote from: Kimo Jesus on May 17, 2010, 06:15:10 am
http://www.freeexampapers.us/IGCSE/Chemistry/CIE/2006%20Nov/0620_w06_qp_6.pdf

can some1 help me with qeustion 4?

the graphs? can some1 draw them ?

its been really difficult for me .. the software (paint =P) doesnt allow me to curve the line more than twice .. there are some points tht dont come on the curve .. actually they wont come even on a hard copy
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Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #918 on: May 17, 2010, 07:04:53 am »
Quote from: ~VIN1094~ on May 17, 2010, 07:02:55 am
its been really difficult for me .. the software (paint =P) doesnt allow me to curve the line more than twice .. there are some points tht dont come on the curve .. actually they wont come even on a hard copy

ouch :P

lol thanks :P i got what i wanted from  nid :P sorry for wasting your time  :-X :-\
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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 Vin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #919 on: May 17, 2010, 07:06:13 am »
Quote from: PeaceMaker on May 17, 2010, 06:43:21 am
I already revised the lab apparatus and the experiements. The only thing i don't know are the tests, does anyone know which chapter they are or better yet what is the chapter which needs to be the most focused one for tests? Also thanks, and good luck.

Don't worry people, its just P6 and its only for 20% so yeah.

If u want the tests  .. on the last page
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Offline Vin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #920 on: May 17, 2010, 07:06:57 am »
Quote from: Kimo Jesus on May 17, 2010, 07:04:53 am
ouch :P

lol thanks :P i got what i wanted from  nid :P sorry for wasting your time  :-X :-\

i saw ur PM .. AFTER posting .. its ok ..  ;)
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Offline PeaceMaker

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #921 on: May 17, 2010, 07:10:05 am »
Quote from: ~VIN1094~ on May 17, 2010, 07:06:13 am
If u want the tests  .. on the last page

Thanks! And good luck for tomorrow dude, and also especially paper 4 maths. I hope we all do good since i messed up big time in paper 2 but oh well, what ever happened, happened.
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Offline Deniz

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #922 on: May 17, 2010, 07:15:47 am »
Quote from: Kimo Jesus on May 17, 2010, 06:53:26 am
LOL this is may june 2006!>im doin the same past paper right now


well i wrote to dissolve the colours..
mark scheme says to EXTRACT THE COLOURS... Boil it and it dissolves :/ cant explain more than that

Thank you Kimo :)
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Offline K_M

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #923 on: May 17, 2010, 07:19:33 am »
Quote from: Kimo Jesus on May 17, 2010, 05:13:52 am
https://studentforums.biz/index.php/topic,7663.0.html

something i made for the paper 6 2mrw

goodluck ! ;D



Thanks!
Goodluckk! =)

By the way do we need to revise organic chemistry for Paper 6? Apart from proving that a substance is an unsaturated hydrocarbon (using bromine water), is there anything else?
« Last Edit: May 17, 2010, 08:11:34 am by K_M »
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Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #924 on: May 17, 2010, 08:13:17 am »
Quote from: K_M on May 17, 2010, 07:19:33 am
Thanks!
Goodluckk! =)

By the way do we need to revise organic chemistry for Paper 6? Apart from proving that a substance is an unsaturated hydrocarbon (using bromine water), is there anything else?
alcohols flammable...colourless...fuel smell..thats it i guess
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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 guMnam

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #925 on: May 17, 2010, 08:22:04 am »
hey guys i want to noe wat is titration i m really confused ??????????????
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Offline K_M

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #926 on: May 17, 2010, 08:25:34 am »
Quote from: Kimo Jesus on May 17, 2010, 08:13:17 am
alcohols flammable...colourless...fuel smell..thats it i guess

By the way there was this question - They want to find out whether ethanol or methanol provides more heat energy when burnt.
In that case do you use a metal caloriemeter and a spirit burner?
Heat a known volume of water with a spirit burner which burns ethanol. Note the temperature change and then repeat with methanol and compare the temperature change of the water. Is that what you're supposed to do?
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Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #927 on: May 17, 2010, 08:28:39 am »
have no idea whats a colri meter

anyway what you do

Measure the itial volume of spirit burner wiht ethanol
pur 100cm3 of distillled water in a copper can by a measureing cyylinder
then Heat to a certain temperature eg 30* C
then measure the final mass of spirit burner

Repeat with other alcohol! and compare the masses!
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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 WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #928 on: May 17, 2010, 08:36:31 am »
m/j 2007 qeustion 4

http://www.freeexampapers.us/IGCSE/Chemistry/CIE/2007%20Jun/0620_s07_qp_6.pdf

whats goin on ? i dunno how to asnwr (a)
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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 Vin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #929 on: May 17, 2010, 08:38:48 am »

used as an indicator .. to check the presence of iodine .. solved this one yest ;)
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