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Author Topic: CHEM AND BIO HELP AND TIPS HERE  (Read 346209 times)

holtadit

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #315 on: March 27, 2010, 06:59:50 am »
Stay online for a few moments
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holtadit

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #316 on: March 27, 2010, 07:02:36 am »
https://studentforums.biz/index.php/topic,6394.0.html

Are you sure about the structure for Ca Cl ?? Why do all the ions connect to one in the middle ?
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nid404

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #317 on: March 27, 2010, 07:05:51 am »
It's not converging at the centre...the bold lines are just showing the 3-D structure
the connecting lines are not in bold...
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Offline The Golden Girl =D

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #318 on: April 03, 2010, 07:32:04 am »
how do i revise for biology , it's such a huge syllabus?!!?! ...oh and can u tell me where can i  find the methods for the experiments in paper 6 chemistry ?

thx in advance
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holtadit

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #319 on: April 03, 2010, 07:36:10 am »
These are bio audio revison files:

http://cid-9132d87007ea7520.skydrive.live.com/browse.aspx/.Public/Biology%20Podcasts%20-%20Audio%20Revision?uc=2



These are revison powerpoints/pdf files:

http://thenightdreamer.wordpress.com/category/subjects/biology/



By the way The Nightdreamer Inc. is my website !!

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nid404

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #320 on: April 03, 2010, 07:58:14 am »
Yes, indeed, of all the 3 sciences, bio has a vast portion....
You may have a good revision guide for igcse....http://www.amazon.co.uk/IGCSE-Study-Guide-Biology-Guides/dp/071957904X
It's excellent

But remember to read your textbook...never leave that out....
And if u don't understand a concept on reading, look online for help....some good diagrams and videos might help.....if u still have problems, post them here  ;)
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Offline The Golden Girl =D

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #321 on: April 03, 2010, 02:12:58 pm »
thx alot  :) ....but u didn't answer my question about the chemistry experiments
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nid404

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #322 on: April 04, 2010, 06:09:57 am »
hmm....overlooked that...srry

Solve as many past papers as you can...

http://www.collinseducation.com/TitlesListing/pages/productshow.aspx?Level1=Secondary&ProductId=35339

A good book with a lot of practical examples....
try getting an e-book cause it is quite expensive....try freeetextbooks.com
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Offline haris94

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #323 on: April 04, 2010, 07:48:12 pm »
can u pls tell me the test for carbonates?
Thanks...
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Offline Saladin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #324 on: April 04, 2010, 08:08:21 pm »
well, wen carboantes react with acids, they give out CO2.

Thus, you will be able to test for the CO2 using limewater.

So simply collect tha gas given off in the reaction between a carbonate and an acid.

And then test the gas given off using limewater. Limewater will become cloudy.
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Offline haris94

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #325 on: April 04, 2010, 08:11:34 pm »
got it
Thanks a lot
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Offline haris94

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #326 on: April 04, 2010, 08:28:34 pm »
one more question
are group 2 carbonates soluble?
if any1 could pls give me a solubility guide, it would be really helpful; im doing igcse chem
Thanks...
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Offline Saladin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #327 on: April 04, 2010, 08:45:08 pm »
The solubility of carbonates decrease down the group.

Thats all you need to know for now, as for particular carbonates, simply search the web to see whether they are soluble or not.
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Offline haris94

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #328 on: April 04, 2010, 09:23:17 pm »
ok great
Thanks
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Offline ruby92

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #329 on: April 06, 2010, 10:23:45 am »
any tips for revsion....seeing as our exams are a month away??
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