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Author Topic: Chemistry Help!  (Read 6792 times)

Offline XaM!!

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Re: Chemistry Help!
« Reply #45 on: April 29, 2009, 01:40:46 pm »
Guys i need help!

1.what is da difference b/w spontinous n displacement Rx?
2.a proper defination of metallic bond like it shud include sea of electrn, latice n blah blah blah
3.IMP: ANYONE WITH ALL APPARATUS AND THEIR NAMES LIST? As this the first question in ppr6 so plz provide me sumthng a page or wateva...
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Offline XaM!!

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Re: Chemistry Help!
« Reply #46 on: April 29, 2009, 01:41:58 pm »
Guys i need help!

1.what is da difference b/w spontinous n displacement Rx?
2.a proper defination of metallic bond like it shud include sea of electrn, latice n blah blah blah
3.IMP: ANYONE WITH ALL APPARATUS AND THEIR NAMES LIST? As this the first question in ppr6 so plz provide me sumthng a page or wateva...
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Offline emi

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Re: Chemistry Help!
« Reply #47 on: April 29, 2009, 03:28:50 pm »
i want to know those too .. thanks
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Offline Guthixol

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Re: Chemistry Help!
« Reply #48 on: April 29, 2009, 05:07:46 pm »
may you explain to me electrolysis in anyway you like to explain it. It helps me if i read someones explanation before i read the whole chapter. thanks :) oh oh..yeah may you explain acids and basis :P i get confused most of the times :-\
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Offline twilight

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Re: Chemistry Help!
« Reply #49 on: April 29, 2009, 07:29:07 pm »
i can define metallic bonding ..

METALLIC BONDING is a regular lattic arrangement of positive ions embeded in a sea of negative electrons

i hope this will do
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Offline hyebyekadal

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Re: Chemistry Help!
« Reply #50 on: April 29, 2009, 07:29:18 pm »
spontaneous reactions are reactions that occur at room temperature as their activation energy isn't very high. and displacement reactions are reactions in which a compound breaks down into 2 or more products.
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Offline astarmathsandphysics

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Re: Chemistry Help!
« Reply #51 on: April 29, 2009, 08:10:12 pm »
The force of attraction between of negative electrons and positive atoms
Keep everything together
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Offline emi

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Re: Chemistry Help!
« Reply #52 on: April 29, 2009, 09:56:54 pm »
thanks ,, but there was a definition about sea of electrons  or delocalised electrons i really cant find a good definition for that one ,, if some one could tell .. and please i want all the aparatus names for the practicle my book dont have all of them because i've seen some in pastpapers that are not in my book .


thanks
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Offline astarmathsandphysics

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Re: Chemistry Help!
« Reply #53 on: April 29, 2009, 10:09:04 pm »
Quote from: Guthixol on April 29, 2009, 05:07:46 pm
may you explain to me electrolysis in anyway you like to explain it. It helps me if i read someones explanation before i read the whole chapter. thanks :) oh oh..yeah may you explain acids and basis :P i get confused most of the times :-\

Electrolysis is used to purify ores. The ore forms the anode and the pure metal the cathode. The anode is connected to the postive terminal of a battery and postive ions of the substance to be purified dissolve from it into solution and move towards the cathode.
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Offline astarmathsandphysics

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Re: Chemistry Help!
« Reply #54 on: April 29, 2009, 10:12:42 pm »
Quote from: emi on April 29, 2009, 09:56:54 pm
thanks ,, but there was a definition about sea of electrons  or delocalised electrons i really cant find a good definition for that one ,, if some one could tell .. and please i want all the aparatus names for the practicle my book dont have all of them because i've seen some in pastpapers that are not in my book .


thanks



In metals, the metal atoms lose their outer electrons to form metal cations. The electrons from all the metal atoms form a "sea" of electrons that can flow around these metal cations. These electrons are often described as delocalised electrons - delocalised means "not fixed in one place" or "free to move".

Also explained more fully here.

http://www.chemguide.co.uk/atoms/bonding/metallic.html

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Offline XaM!!

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Re: Chemistry Help!
« Reply #55 on: April 30, 2009, 07:18:43 am »
What abt apparatus? N Thanks 4 da other ques...
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