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Author Topic: Chemistry Help HERE ONLY !!  (Read 106176 times)

Offline THEIGBOY

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Re: Chemistry Help HERE ONLY !!
« Reply #585 on: May 31, 2009, 09:10:19 am »
guyz please help me with this part of the syllabus....

"identify redox reactions by changes in
oxidation state and by the colour changes
involved when using acidified potassium
manganate(VII), and potassium iodide."

Please tell me everything i shud know about this
Thanks...
THEIGBOY
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Offline SGVaibhav

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Re: Chemistry Help HERE ONLY !!
« Reply #586 on: May 31, 2009, 09:13:29 am »
Suggest an explanation why Butan-1-ol cannot form long polymer molecules but ethane-1,2-diol can.


2 marks
very hard  :'( :'(
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Offline THEIGBOY

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Re: Chemistry Help HERE ONLY !!
« Reply #587 on: May 31, 2009, 09:14:15 am »
Quote from: Shogun on May 31, 2009, 09:09:21 am
wat my teacher said,more saturated means more hydrogen
Saturated is where the bondings are all single....i.e. no double or triple bonding.
unsaturated is where there are one or double bonds in the fat chain

There are two types of unsaturated fats
i) mono-unsaturated - i.e. there is only one double bond in the chain
ii)poly-unsaturated - i.e. there are more than one double bonds in the chain...
hope it helps...
THEIGBOY
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nid404

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Re: Chemistry Help HERE ONLY !!
« Reply #588 on: May 31, 2009, 09:15:16 am »
Quote from: THEIGBOY on May 31, 2009, 09:10:19 am
guyz please help me with this part of the syllabus....

"identify redox reactions by changes in
oxidation state and by the colour changes
involved when using acidified potassium
manganate(VII), and potassium iodide."

Please tell me everything i shud know about this
Thanks...
THEIGBOY
Potassium manganate(VII) to manganese(II) salt--purple to colorless (reduction (7 to 2))
Potassium iodide to iodine--colorless to brown( 2I-to I2(oxidation))


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Offline SGVaibhav

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Re: Chemistry Help HERE ONLY !!
« Reply #589 on: May 31, 2009, 09:17:56 am »
Quote from: sgvaibhav on May 31, 2009, 09:13:29 am
Suggest an explanation why Butan-1-ol cannot form long polymer molecules but ethane-1,2-diol can.


2 marks
very hard  :'( :'(

very hard  :'( :'(
professionals need ur help
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Offline THEIGBOY

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Re: Chemistry Help HERE ONLY !!
« Reply #590 on: May 31, 2009, 09:23:34 am »
Quote from: sgvaibhav on May 31, 2009, 09:13:29 am
Suggest an explanation why Butan-1-ol cannot form long polymer molecules but ethane-1,2-diol can.


2 marks
very hard  :'( :'(
Look
ethane-1,2-diol can has two -OH
while Butan-1-ol has only one -OH
when polymerization occurs, for Butan-1-ol, only one -OH is replaced so it cannot continue in a long polymer
where as in ethane-1,2-diol, two -OH are replaced so it can continue in a long polymer
basically the ethane-1,2-diol will form the similar monomer to polyethene
I'll post a picture in a minute... for explanation

Hope that helps
THEIGBOY
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nid404

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Re: Chemistry Help HERE ONLY !!
« Reply #591 on: May 31, 2009, 09:34:15 am »
Quote from: sgvaibhav on May 31, 2009, 09:17:56 am
Quote from: sgvaibhav on May 31, 2009, 09:13:29 am
Suggest an explanation why Butan-1-ol cannot form long polymer molecules but ethane-1,2-diol can.


2 marks
very hard  :'( :'(

very hard  :'( :'(
professionals need ur help

 butan-1-ol is saturated, it cannot form a polymer(if two of them join there won't be a continuous link). Well ethane-1,2- diole is a sugar.(remember sugars OH[    ]OH) so it can polymerise(condensation polymerisation) to form starch and water

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Offline THEIGBOY

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Re: Chemistry Help HERE ONLY !!
« Reply #592 on: May 31, 2009, 09:48:54 am »
Quote from: sgvaibhav on May 31, 2009, 09:13:29 am
Suggest an explanation why Butan-1-ol cannot form long polymer molecules but ethane-1,2-diol can.


2 marks
very hard  :'( :'(
Just finished making the picture,here it is...
Hope it explains everything u want to know
By the way... +rep me if it helps
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Offline THEIGBOY

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Re: Chemistry Help HERE ONLY !!
« Reply #593 on: May 31, 2009, 09:49:50 am »
Quote from: nid404 on May 31, 2009, 09:15:16 am
Quote from: THEIGBOY on May 31, 2009, 09:10:19 am
guyz please help me with this part of the syllabus....

"identify redox reactions by changes in
oxidation state and by the colour changes
involved when using acidified potassium
manganate(VII), and potassium iodide."

Please tell me everything i shud know about this
Thanks...
THEIGBOY
Potassium manganate(VII) to manganese(II) salt--purple to colorless (reduction (7 to 2))
Potassium iodide to iodine--colorless to brown( 2I-to I2(oxidation))



Thanks alot
By the way... this is all i have to know????
Thanks again
and best of luck for 2moz exam
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Offline THEIGBOY

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Re: Chemistry Help HERE ONLY !!
« Reply #594 on: May 31, 2009, 09:51:20 am »
Quote from: THEIGBOY on May 31, 2009, 09:48:54 am
Quote from: sgvaibhav on May 31, 2009, 09:13:29 am
Suggest an explanation why Butan-1-ol cannot form long polymer molecules but ethane-1,2-diol can.


2 marks
very hard  :'( :'(
Just finished making the picture,here it is...
Hope it explains everything u want to know
By the way... +rep me if it helps
EDIT:---> sorry forgot to put arrow between first and second diagram of ethane-1,2-diol
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Offline SGVaibhav

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Re: Chemistry Help HERE ONLY !!
« Reply #595 on: May 31, 2009, 09:53:21 am »
SMART
+REP
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Offline godfather93

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Re: Chemistry Help HERE ONLY !!
« Reply #596 on: May 31, 2009, 09:54:12 am »
thanks igboy
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Offline Shogun

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Re: Chemistry Help HERE ONLY !!
« Reply #597 on: May 31, 2009, 09:57:31 am »
can anyone give me list of:
1)soluble carbonates and the insoluble ones
2)insoluble alkalis, and soluble ones
3)soluble oxides and insoluble ones
4) amphotric oxides
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Offline THEIGBOY

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Re: Chemistry Help HERE ONLY !!
« Reply #598 on: May 31, 2009, 10:01:14 am »
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Offline Ghost Of Highbury

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Re: Chemistry Help HERE ONLY !!
« Reply #599 on: May 31, 2009, 10:03:06 am »
i think all Group IA carbonates as in sodium carbonate, lithium carbonate etc. are soluble and the rest are insolubl.

will find abt the rest shortly..
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