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Physical Chemistry

Hot goIITian

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28 Feb 2008 18:23:57 IST

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498

few Ds

None

1) is it true that undersome condn Mg can reduce SiO2 & si can reduce MgO?

under what conditions??????

2) compound used in soap as antiseptic??

3) whats ferrocene???

4) Al significantly electropositive electropositive yet used as structural material?

5) why alpha helix of protein named 3.6 ₁₃helix??????

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varsha valli g.

Blazing goIITian

Joined: 31 Jan 2007

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28 Feb 2008 18:52:43 IST

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2)bithinal or also known as bithinol
3)Fe(CO)5
4)in the presence of an oxdn agent,a protective layer of oxide film is formed on the metal which makes it inert.
hope this helps
!!!!!!!!!!!!!!!!!!

Srujana

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28 Feb 2008 19:11:02 IST

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Ferrocene is an organometallic compound.
It has sandwich structure

Formula :Fe(CO)₅

ram kumar

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28 Feb 2008 21:51:46 IST

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ferrocene formula is Fe(C₅H₅)₂ ............ its not Fe(CO)₅ .........

IUPAC NAME :::: bis(cyclopentadienyl)iron(II)

above 1693 K ., Si can reduce MgO to Mg

below 1693K , Mg can reduce SiO2 to Si

Avi .....

Blazing goIITian

Joined: 19 Feb 2008

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28 Feb 2008 21:58:31 IST

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yes it is fairly possible....according to the ellingham diagram, the curves of Gibbs free energy,
for formation of MgO and SiO2 intersect at a particular tempr(sorry i dont hav exact value..but it must sumwhere around 1700K)

and on one of the sides of that intersection point, one of them reduces the other and vicec vers on the other side of curve...

Avi .....

Blazing goIITian

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28 Feb 2008 21:59:36 IST

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bithional used in soaps to give antiseptic character

ankita raisinghani

Cool goIITian

Joined: 22 Jan 2008

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28 Feb 2008 22:11:23 IST

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THAT SIO2 QUES IS GIVEN IN NCERT INTEXT EVEN THE ANSER IS GIVEN AND THE ANSER IS OF AL2O3 LINE IN ELL . DIAGRAM I SUPPOSE IT WRONG

NE 1?

Halo

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29 Feb 2008 10:44:54 IST

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good work guys

ram kumar

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7 Mar 2008 15:53:03 IST

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alpha helix is called 3.6 13 because in each alpha helical turn there are approximately 3.6 amino acids and hydrogen bonding leads to formation of a 13 membered ring.........

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