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Author Topic: CHEM AND BIO HELP AND TIPS HERE  (Read 354188 times)

Offline DEGO

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1230 on: May 17, 2010, 08:51:57 pm »
Quote from: Kimo Jesus on May 17, 2010, 08:49:06 pm
remember whn i said less soluble and more solube?

crystas would appear at lower temp becaz they dissolve at lower temp
i know wht u answer is B i need D he use 2.5g instead of 5g so wht temp change??? SO CN U EXPLAIN TO ME Y IT REDUCED???
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Offline Baladya

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1231 on: May 17, 2010, 08:53:26 pm »
http://www.freeexampapers.us/IGCSE/Chemistry/CIE/2009%20Jun/0620_s09_qp_6.pdf

5)c)ii) How does the mark scheme say blue ppt. Copper isnt soluble in excess........
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Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1232 on: May 17, 2010, 08:56:35 pm »
Quote from: DEGO on May 17, 2010, 08:51:57 pm
i know wht u answer is B i need D he use 2.5g instead of 5g so wht temp change??? SO CN U EXPLAIN TO ME Y IT REDUCED???

its has nothing to do with temperature change..

it says how would the results difer

can u tell me wht the answer in the mark scheme is?
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Offline DEGO

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1233 on: May 17, 2010, 08:57:38 pm »
TEMP BE LOWER
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Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1234 on: May 17, 2010, 08:58:33 pm »
Quote from: Baladya on May 17, 2010, 08:53:26 pm
http://www.freeexampapers.us/IGCSE/Chemistry/CIE/2009%20Jun/0620_s09_qp_6.pdf

5)c)ii) How does the mark scheme say blue ppt. Copper isnt soluble in excess........

it is solube in excess with ammonia forming a dark blue solution
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Offline Vin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1235 on: May 17, 2010, 08:59:06 pm »
Quote from: Baladya on May 17, 2010, 08:53:26 pm
http://www.freeexampapers.us/IGCSE/Chemistry/CIE/2009%20Jun/0620_s09_qp_6.pdf

5)c)ii) How does the mark scheme say blue ppt. Copper isnt soluble in excess........

action with aq. ammonia gives light blue ppt.. and copper is soluble in access aq. ammonia gives royal bule
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Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1236 on: May 17, 2010, 09:01:08 pm »
Quote from: DEGO on May 17, 2010, 08:57:38 pm
TEMP BE LOWER

yea caz 2.5g of it..dissovles at 25 * c
and 5g of it wil dissolve at 50 * c


so when will the crystalls appear..at a lower temperate..25..
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Offline guMnam

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1237 on: May 17, 2010, 09:02:31 pm »
Quote from: Baladya on May 17, 2010, 08:53:26 pm
http://www.freeexampapers.us/IGCSE/Chemistry/CIE/2009%20Jun/0620_s09_qp_6.pdf

5)c)ii) How does the mark scheme say blue ppt. Copper isnt soluble in excess........
copper...
with sodium hydroxide ...light blue ppt...insoluble in excess
with amonia...light blue ppt...soluble in exsecc givin royal blue solution..:d
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Offline Baladya

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1238 on: May 17, 2010, 09:02:56 pm »
Quote from: ~VIN1094~ on May 17, 2010, 08:59:06 pm
action with aq. ammonia gives light blue ppt.. and copper is soluble in access aq. ammonia gives royal bule

srry i meant (i)

By the way u like my new signature :D
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Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1239 on: May 17, 2010, 09:06:34 pm »
Quote from: Baladya on May 17, 2010, 09:02:56 pm
srry i meant (i)

By the way u like my new signature :D
yep awsome  (
1) WHAT?
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NO secrets to SUCCESS , it is the result of 1.HARD WORK 2.GOOD PREPARATION 3.LEARNING FROM FAILURE
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Offline DEGO

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1240 on: May 17, 2010, 09:06:43 pm »
Quote from: Kimo Jesus on May 17, 2010, 09:01:08 pm
yea caz 2.5g of it..dissovles at 25 * c
and 5g of it wil dissolve at 50 * c


so when will the crystalls appear..at a lower temperate..25..
HMM I DON GET IT  as the mass no relation between temp so wht made this go to tht if it says rate or something thn thts ok no arguement (tht ms have mistakes as it test if water is pure with cobalt chloride nonsense as it is measured by the boiling point daaaaah)
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Offline Vin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1241 on: May 17, 2010, 09:07:24 pm »
Quote from: Baladya on May 17, 2010, 09:02:56 pm
srry i meant (i)

By the way u like my new signature :D

yea so it is light bule ppt.

LOL @ sig. LMAO !!
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Offline guMnam

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1242 on: May 17, 2010, 09:07:49 pm »
Quote from: Baladya on May 17, 2010, 09:02:56 pm
srry i meant (i)

By the way u like my new signature :D
how much tyme u have for all tht ane ways..if sumthin is insoluble...wat does it mean.....it means tht it will be left at the botom of the beaker..and it is bue in colour in this case....:D
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Offline Baladya

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1243 on: May 17, 2010, 09:08:42 pm »
Quote from: ~VIN1094~ on May 17, 2010, 09:07:24 pm
yea so it is light bule ppt.

LOL @ sig. LMAO !!

Owkay... thx guys :)
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Offline Vin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #1244 on: May 17, 2010, 09:13:31 pm »
Quote from: Baladya on May 17, 2010, 09:08:42 pm
Owkay... thx guys :)

still LMOA .. =P

XD
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