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Author Topic: CHEM AND BIO HELP AND TIPS HERE  (Read 333164 times)

Offline Shazizzzle

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1200 on: May 17, 2010, 07:13:04 pm »
Abbay, in cheezoon pe sar khapanay se behtar hai ja ke pp karo.
Wo ye poochain ge nahin. :S
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Offline bulono

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1201 on: May 17, 2010, 07:13:45 pm »
Final temperature means temperature after the reaction has stopped
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Offline Ghost Of Highbury

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1202 on: May 17, 2010, 07:14:42 pm »
Quote from: Kimo Jesus on May 17, 2010, 06:59:09 pm
ok well in nov 09

it says HIGHER TEMP CHANGES ..BUT IGNORE RATE? why??

this is wat the "er" says..

Candidates found this difficult and it was a good discriminator. Many candidates thought that the
temperature change would be the same or lower. Vague answers discussed the rate of the
reaction and did not answer the question.

probably thats y they wrote "ignore rate"

@Shaizzzle - LOL@"khapanay se" ... u too from india?? mumbai?
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Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1203 on: May 17, 2010, 07:15:00 pm »
Quote from: A@di on May 17, 2010, 07:10:05 pm
so....greater/higher temp. change, they mean the final temperature rite??
nope!

the temperature change in a second

for example temp increase  by 1  is 1 sec with mg ribon
                 temp increas e by 5  is 1 sec with mg powder ( but this reaction will finish faster )

but the final temp will be the same!  

si?
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Offline rhea

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1204 on: May 17, 2010, 07:16:57 pm »
anybody doing paper 5 tomorrow?

http://www.freeexampapers.us/IGCSE/Chemistry/CIE/2009%20Jun/0620_s09_qp_5.pdf
q2 g and h

how can one identify transition metals, more specifically manganese oxide?
also, whats the test that identifies oxide ionS?
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Offline Shazizzzle

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1205 on: May 17, 2010, 07:17:41 pm »
Quote from: A@di on May 17, 2010, 07:14:42 pm
this is wat the "er" says..

Candidates found this difficult and it was a good discriminator. Many candidates thought that the
temperature change would be the same or lower. Vague answers discussed the rate of the
reaction and did not answer the question.

probably thats y they wrote "ignore rate"

@Shaizzzle - LOL@"khapanay se" ... u too from india?? mumbai?

Umm.... PAKISTAN! PAKISTAN! PAKISTAN! MUSLIM!
I swear, why does EVERYONE assume India?! :@
And I've lived in Saudi Arabia for 12 years, and still do, before you go making incorrect assumptions. :/
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Offline Baladya

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1206 on: May 17, 2010, 07:19:24 pm »
Increasing the concentration of the solute and solvent will make the reaction faster
Increasing the AMOUNT of the solute will make it faster but increasing the amount of the solvent will make it take longer...

RIGHT???????
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Offline guMnam

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1207 on: May 17, 2010, 07:19:34 pm »
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Offline Ghost Of Highbury

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1208 on: May 17, 2010, 07:20:51 pm »
Quote from: rhea on May 17, 2010, 07:16:57 pm
anybody doing paper 5 tomorrow?

http://www.freeexampapers.us/IGCSE/Chemistry/CIE/2009%20Jun/0620_s09_qp_5.pdf
q2 g and h

how can one identify transition metals, more specifically manganese oxide?
also, whats the test that identifies oxide ionS?


Transition metals have a very unique property .. i.e they are "Coloured".

Here, solid S was black, again a color.

Also, Most of the transition metals are catalysts...here test (e) says hydrogen peroxide was added and rapid effervescence was observed. Meaning, the catalyst/transition metal helped in the decomposition of H2O2
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Offline Ghost Of Highbury

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1209 on: May 17, 2010, 07:21:17 pm »
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Offline Ghost Of Highbury

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1210 on: May 17, 2010, 07:22:11 pm »
Quote from: Shazizzzle on May 17, 2010, 07:17:41 pm
Umm.... PAKISTAN! PAKISTAN! PAKISTAN! MUSLIM!
I swear, why does EVERYONE assume India?! :@
And I've lived in Saudi Arabia for 12 years, and still do, before you go making incorrect assumptions. :/

Sorry, didnt know that. No intentions of making incorrect assumptions. Apologies.
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Offline DEGO

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1211 on: May 17, 2010, 07:23:13 pm »
KIMO SAME EXAM SAME QUESRION d XD
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Offline Baladya

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1212 on: May 17, 2010, 07:23:22 pm »
Quote from: Kimo Jesus on May 17, 2010, 07:15:00 pm
nope!

the temperature change in a second

for example temp increase  by 1  is 1 sec with mg ribon
                 temp increas e by 5  is 1 sec with mg powder ( but this reaction will finish faster )

but the final temp will be the same!  

si?

So final temp IS THE SAME RIGHT???
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Offline BusinessMaNiac! ( Shizzle)

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1213 on: May 17, 2010, 07:29:55 pm »
Quote from: Shazizzzle on May 17, 2010, 07:13:04 pm
Abbay, in cheezoon pe sar khapanay se behtar hai ja ke pp karo.
Wo ye poochain ge nahin. :S

hey tumhare asli nam kiya hai?
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Offline rhea

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1214 on: May 17, 2010, 07:31:54 pm »
Quote from: A@di on May 17, 2010, 07:20:51 pm

Transition metals have a very unique property .. i.e they are "Coloured".

Here, solid S was black, again a color.

Also, Most of the transition metals are catalysts...here test (e) says hydrogen peroxide was added and rapid effervescence was observed. Meaning, the catalyst/transition metal helped in the decomposition of H2O2
umm okay thanks :)
but how does "oxide" come in the results for solid S?
cuz i though that since oxide is present in hydrogenperoxide, so its not going to be there in S...
HELP!! PLEAASSEE!
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