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Author Topic: CHEM AND BIO HELP AND TIPS HERE  (Read 381078 times)

Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1140 on: May 17, 2010, 05:06:30 pm »
whats extrapolation?
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Offline Shazizzzle

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1141 on: May 17, 2010, 05:06:52 pm »
I'm just wasting my time and effort here.

Since A@di, 'Global Moderator', is here to answer all questions as accurately as they can be answered, because he's already been gifted an A* before hand, I guess no one here will go un answered, so It'll hardly make a difference if I leave.
Besides, apparently, my answers are all 'wrong' anyway, which is why he feels the need to re answer the questions I answered.

So, bye folks! And umm, BEST OF LUCK FOR TOMORROW! :D
Good Luck! It'll be easy InshAllah! :)
Laters.
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Offline Shazizzzle

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1142 on: May 17, 2010, 05:08:26 pm »
Quote from: Kimo Jesus on May 17, 2010, 05:06:30 pm
whats extrapolation?

Extending the graph/line/curve roughly as an estimate to reach an answer. Like, extending the curve roughly in the same direction to predict what will happen at a greater temp. Etc.
And also, showing your working lines. etc.
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Offline Ghost Of Highbury

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1143 on: May 17, 2010, 05:09:57 pm »
Quote from: Shazizzzle on May 17, 2010, 05:06:52 pm
I'm just wasting my time and effort here.

Since A@di, 'Global Moderator', is here to answer all questions as accurately as they can be answered, because he's already been gifted an A* before hand, I guess no one here will go un answered, so It'll hardly make a difference if I leave.
Besides, apparently, my answers are all 'wrong' anyway, which is why he feels the need to re answer the questions I answered.

So, bye folks! And umm, BEST OF LUCK FOR TOMORROW! :D
Good Luck! It'll be easy InshAllah! :)
Laters.

Please try your best to stay for as long as possible. You're doing a great job, and none of ur answers are incorrect till now. It will make a hell lotta difference if u leave.

Good luck to you too. Im pretty sure u'll do well. :)
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Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1144 on: May 17, 2010, 05:10:30 pm »
Quote from: Shazizzzle on May 17, 2010, 05:08:26 pm
Extending the graph/line/curve roughly as an estimate to reach an answer. Like, extending the curve roughly in the same direction to predict what will happen at a greater temp. Etc.
And also, showing your working lines. etc.

o ok cheers
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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 Lariemeeva

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1145 on: May 17, 2010, 05:13:25 pm »
Sorry for the bother again, but I'm still hoping someone can help with this...

Quote from: Lariemeeva on May 17, 2010, 04:33:19 pm
Thanks again A@di

Anyways, I have studied until now:

1. Experimental Techniques
2. Stoichiometry
3. Electricity and Chemistry
4. Chemical Changes
5. Chemical Reactions
6. Acids, Bases and Salts

Are there any other topics I should study for tomorrow (Paper 6), and is there any topic from those that I don't need to focus on much while I'm doing my revision now?

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Offline Ghost Of Highbury

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1146 on: May 17, 2010, 05:15:45 pm »
Quote from: Lariemeeva on May 17, 2010, 05:13:25 pm
Sorry for the bother again, but I'm still hoping someone can help with this...


Its better if u dont skip important and "not-so-important" chapters for paper 6. Learn all of 'em...anything can come up. CIE is evil
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Offline Fastal

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1147 on: May 17, 2010, 05:17:39 pm »
november 2001 Chemistry paper 6
5 c

why does it look brown?

http://www.freeexampapers.us/IGCSE/Chemistry/CIE/2001%20Nov/0620_w01_qp_6.pdf
« Last Edit: May 17, 2010, 05:20:06 pm by Fastal »
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Offline Lariemeeva

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1148 on: May 17, 2010, 05:21:32 pm »
^^I can't agree more.
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Offline Ghost Of Highbury

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1149 on: May 17, 2010, 05:27:32 pm »
Quote from: Fastal on May 17, 2010, 05:17:39 pm
november 2001 Chemistry paper 6
5 c

why does it look brown?

http://www.freeexampapers.us/IGCSE/Chemistry/CIE/2001%20Nov/0620_w01_qp_6.pdf

The light green precipitate slowly turns brown (looks dirty green)

This is the observation of Fe(ii) test.

"Dirty-green precipitate, turning brown on standing: Fe2+"
« Last Edit: May 17, 2010, 05:29:18 pm by A@di »
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Offline saleemsamer

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1150 on: May 17, 2010, 05:28:38 pm »
m/j 06 p6 q3 d and e plz
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Offline Shazizzzle

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1151 on: May 17, 2010, 05:28:48 pm »
Quote from: Fastal on May 17, 2010, 05:17:39 pm
november 2001 Chemistry paper 6
5 c

why does it look brown?

http://www.freeexampapers.us/IGCSE/Chemistry/CIE/2001%20Nov/0620_w01_qp_6.pdf

Due to contact with the air (O2), of the surface, the iron (II) oxidizes to iron (III), which turns from a dirty green to brown colour, as Iron (III) is red-brown.
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nid404

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1152 on: May 17, 2010, 05:29:30 pm »
It turns brown because it changes from Iron(II) hydroxide(which is green) to Iron(III) hydroxide(which is brown)
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Offline Fastal

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1153 on: May 17, 2010, 05:38:53 pm »
Quote from: Shazizzzle on May 17, 2010, 05:28:48 pm
Due to contact with the air (O2), of the surface, the iron (II) oxidizes to iron (III), which turns from a dirty green to brown colour, as Iron (III) is red-brown.
so iron(ii) compounds are unstable??
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Offline Fastal

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1154 on: May 17, 2010, 05:40:50 pm »
Quote from: A@di on May 17, 2010, 05:27:32 pm
The light green precipitate slowly turns brown (looks dirty green)

This is the observation of Fe(ii) test.

"Dirty-green precipitate, turning brown on standing: Fe2+"

thats not in any textbook i have
where did you get this?
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