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Author Topic: CHEM AND BIO HELP AND TIPS HERE  (Read 334118 times)

Offline Lariemeeva

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #870 on: May 16, 2010, 04:31:39 pm »
Ah right!
Thanks everyone for your replies...
They actually had the tests for everything back before at the end of their papers! So lucky, but I'm assuming their syllabus only uses tests for reference the way were going to use the periodic table...
« Last Edit: May 16, 2010, 04:34:28 pm by Lariemeeva »
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Offline DEGO

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #871 on: May 16, 2010, 04:50:31 pm »
Quote from: 6394 on May 16, 2010, 04:21:22 pm
ohk 1 more ques
it came in my mocks :
         why the mixture <i thnk it was a precipitate> shud b filtered and washed ??
     FILTERED to remove insoluble impurities
      why WASHED????
washed to get rid of any remains of the liquids
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Offline thenewkid™

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #872 on: May 16, 2010, 05:03:16 pm »
how are we supposed to draw a diagram in bio p6 wen they giv u a pic???
i am really bad at drawing. does this mean i hv no hope 4 tht question?????
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Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #873 on: May 16, 2010, 05:17:47 pm »
Quote from: 6394 on May 16, 2010, 04:10:39 pm
ny1 noes whethr m ryt
n ya wat is a spirit lamp" Use spirit burners to compare energy produced by different alcohols."

go on google type spirti burners adn see the image

what it is ..its like a bunsen burner but except that no gas pipe is attached to it.. there is liquid insde it..( alcohole ) which is flammable afcourse...so all you do is light it and the it burns !

and so what happens is we measure the mass of a spirt burner b4 an experiment and heat water to rise to certan temperature..and then we measure the new mass ..and we compare with other alcohols.etc
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Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #874 on: May 16, 2010, 05:19:51 pm »
Quote from: 6394 on May 16, 2010, 04:21:22 pm
ohk 1 more ques
it came in my mocks :
         why the mixture <i thnk it was a precipitate> shud b filtered and washed ??
     FILTERED to remove insoluble impurities
      why WASHED????
washed to remove any soluble liquied that mght be stuck on it..its not washed really ..jsut MINIMAL AMOUNT OF COLD DISTILLED WATER IS PASSED OVER IT SO THE SOLULE MATERIAL THAT IS TRACED ON THE INSOLUBLE COULD LEAVE THRO THE FILTER PAPER


PS : i never heard of locating agent of uv rays..maybe right? but i never heard of it
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6394

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #875 on: May 16, 2010, 05:21:34 pm »
Quote from: Kimo Jesus on May 16, 2010, 05:17:47 pm
go on google type spirti burners adn see the image

what it is ..its like a bunsen burner but except that no gas pipe is attached to it.. there is liquid insde it..( alcohole ) which is flammable afcourse...so all you do is light it and the it burns !

and so what happens is we measure the mass of a spirt burner b4 an experiment and heat water to rise to certan temperature..and then we measure the new mass ..and we compare with other alcohols.etc
Thanks for ur help
:P =D
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6394

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #876 on: May 16, 2010, 05:23:08 pm »
Quote from: Kimo Jesus on May 16, 2010, 05:19:51 pm
washed to remove any soluble liquied that mght be stuck on it..its not washed really ..jsut MINIMAL AMOUNT OF COLD DISTILLED WATER IS PASSED OVER IT SO THE SOLULE MATERIAL THAT IS TRACED ON THE INSOLUBLE COULD LEAVE THRO THE FILTER PAPER


PS : i never heard of locating agent of uv rays..maybe right? but i never heard of it

Thanks agn
evn m nt sure bt i thnk last yr or sumthin my teachr was telin me abt this ;>
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Offline Kim

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #877 on: May 16, 2010, 05:23:17 pm »
i know that locating reagent is right
but i am not sure about uv
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Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #878 on: May 16, 2010, 05:23:44 pm »
no prob ..your questions are itnresting  ::) + good revision :P
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6394

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #879 on: May 16, 2010, 05:26:40 pm »
Quote from: Kimo Jesus on May 16, 2010, 05:23:44 pm
no prob ..your questions are itnresting  ::) + good revision :P
lol Thanks :D
SO hw r u feelin nw
u wernt feelin wel b4 ryt??
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Offline thenewkid™

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #880 on: May 16, 2010, 05:27:57 pm »
yes uv can be used as a locating reagent but only in very rare conditions
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Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #881 on: May 16, 2010, 05:31:03 pm »
Quote from: 6394 on May 16, 2010, 05:26:40 pm
lol Thanks :D
SO hw r u feelin nw
u wernt feelin wel b4 ryt??

im gr8 :P its just tht i have to do 8 more paper 6 for 2day ..boring :/ but this site encourages me raelly !! thx 4 askin :P
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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 J.Darren

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #882 on: May 16, 2010, 05:31:44 pm »
Quote from: DEGO on May 16, 2010, 04:50:31 pm
washed to get rid of any remains of the liquids
Traces of the solution to be exact, in Percipitation you get an insoluble ppt and a solution, the ppt must be rinsed to remove the traces of the solution. As rinsing would attach water molecules to the percipitate, it then must also be placed in an oven to dry ...
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6394

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #883 on: May 16, 2010, 05:34:19 pm »
Quote from: thenewkid™ on May 16, 2010, 05:27:57 pm
yes uv can be used as a locating reagent but only in very rare conditions
Thanks
bt still bttr 2 ryt abt the locating agent
 ;D ;D
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Offline Kim

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #884 on: May 16, 2010, 05:35:54 pm »
Quote from: 6394 on May 16, 2010, 05:34:19 pm
Thanks
bt still bttr 2 ryt abt the locating agent
 ;D ;D


just write locating reagent for ur answer ull get the mark
believe me i did my ig last year and dats all i learnt
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After all is said and done, more is said than done.

By the time a man realizes that maybe his father was right, he usually has a son who thinks he’s wrong.

The early bird may get the worm, but the second mouse gets the cheese.
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