Author Topic: Chemistry Help HERE ONLY !!  (Read 107173 times)

Offline unknown 101

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Re: Chemistry Help HERE ONLY !!
« Reply #165 on: May 28, 2009, 02:28:06 pm »
Reactivity table    /\
                         |
Potassium            |        [PETER'S]
Sodium                |         [SISTER]
Calcium               |         [CAN]
Magmesium          |         [MURDER]
aluminium            |           [A]
carbon               |           [CONSTIPATED]
zinc                   |          [ZEBRA]
iron                   |           [IN]
tin                    |           [THE]                      / Increasing of reactivity
lead                  |           [liGHT]
hydrogen           |           [HOUSE]
copper              |            [CAN]
silver                |            [SHE]
gold                  |           [GO]
platinum            |             [PLEASE?]


Sorry could not draw a good arrow for the increasing of reactivity...hope this helps

my friend tought me an easier way to study these...luk up^^^^
HOPES THIS HELPS  :D

this is gd but u forgot lithium which is under sodium

Offline Ghost Of Highbury

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Re: Chemistry Help HERE ONLY !!
« Reply #166 on: May 28, 2009, 02:31:12 pm »
yes..correct...forgot lithium
anyway we can change it a bit

peter's sister lauren can murder a ..............

lol
haha
divine intervention!

Offline unknown 101

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Re: Chemistry Help HERE ONLY !!
« Reply #167 on: May 28, 2009, 02:37:41 pm »
yes..correct...forgot lithium
anyway we can change it a bit

peter's sister lauren can murder a ..............

lol
haha

hahahaha , very good, lmao

Offline angell

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Re: Chemistry Help HERE ONLY !!
« Reply #168 on: May 28, 2009, 02:41:55 pm »
I have a couple of doubts people:

a) Could somebody help me out with naming the 'isomers' for example, how should we know where to write 1,2-dimethyl, etc etc

b) Displacement of ammonia from its salts (explain please!)

c) Displacement reactions in metals, e/g with nitrates, hydroxides etc!!

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Offline unknown 101

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Re: Chemistry Help HERE ONLY !!
« Reply #169 on: May 28, 2009, 02:59:17 pm »
I have a couple of doubts people:

a) Could somebody help me out with naming the 'isomers' for example, how should we know where to write 1,2-dimethyl, etc etc

b) Displacement of ammonia from its salts (explain please!)

c) Displacement reactions in metals, e/g with nitrates, hydroxides etc!!



a) i doubt anyone can explain without a diagram, but ill try,    first u will hace the carbon chain eg.   -C-C-C-C-C-C- , and hydrogen all around it , so this is the alkane: pentane
so u replace a hydrogen on the second carbon from the left, with a methane so its gonna become 
      H    CH3    H    H      H
H---C---C----C---C----C---H   
      H    H      H    H      H

//// this would be the new product, which is pentane but with methane on carbon2 , so its going to be 2-methylpentane ,, if it had 2 methyl- functional groups then it would be (Number of carbons seperated by(,), depending on where the functional groups are) dimethylpentane
if it was 3 then it would be tri, 4 would be tetra.

B) ammonia is only displaced from its salts when it is reacted with a metal hydroxide, u do not need to know how it is done

C) please be more precise, so i can explain, give example or watever

Offline Mastermind

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Re: Chemistry Help HERE ONLY !!
« Reply #170 on: May 28, 2009, 03:08:24 pm »
Can someone give me a brief explanation on the Extraction of Aluminium?
I always get confused
"Relax & take notes, Imma give you great quotes"

Offline Mastermind

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Re: Chemistry Help HERE ONLY !!
« Reply #171 on: May 28, 2009, 03:13:49 pm »
May/Jun 2008 //Q6)c)(ii)

another Question since no one is askin anything

Pasteur said that fermentation was respiration in the absence of air. Suggest a
definition of respiration.[2]

Thats easy, respiration is the release of energy using oxygen & glucose to give CO2 + water + energy

By the way, lil wayne sucks! =P
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Offline unknown 101

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Re: Chemistry Help HERE ONLY !!
« Reply #172 on: May 28, 2009, 03:17:29 pm »
Can someone give me a brief explanation on the Extraction of Aluminium?
I always get confused

aluminium is extracted by electrolysis, it is extracted from its orebauxite (Al2O3). and since pure aluminiumoxide melts at 2000 degree C, they add molten cryolite, which lowers the melting point to about 950, thus reducing costs, aluminium is produced at the cathode (Al3+ + 3e- goes to Al) and at the cathode (2O2- - 4e- goes to O2) a, also carbon dioxide may be produced when it reacts with the carbon electrode

Offline Mastermind

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Re: Chemistry Help HERE ONLY !!
« Reply #173 on: May 28, 2009, 03:19:56 pm »
Can someone give me a brief explanation on the Extraction of Aluminium?
I always get confused

aluminium is extracted by electrolysis, it is extracted from its orebauxite (Al2O3). and since pure aluminiumoxide melts at 2000 degree C, they add molten cryolite, which lowers the melting point to about 950, thus reducing costs, aluminium is produced at the cathode (Al3+ + 3e- goes to Al) and at the cathode (2O2- - 4e- goes to O2) a, also carbon dioxide may be produced when it reacts with the carbon electrode
Ah Thanks man, always got confused with the cryolite
& Carbondioxide is produce because the oxygen reacts with the carbon rod, which is why it needs to be replaced constantly
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Offline unknown 101

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Re: Chemistry Help HERE ONLY !!
« Reply #174 on: May 28, 2009, 03:20:47 pm »
u may get 1 mark
cuz u have to say the release of energy by living cells from food

and By the way LIL WAYNE IS THE BEST RAPPER ALIVE , so stop hating

Offline unknown 101

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Re: Chemistry Help HERE ONLY !!
« Reply #175 on: May 28, 2009, 03:28:15 pm »
another question ..

Name 2 ways of obtaining hydrogen (on a large scale)?

Offline Mastermind

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Re: Chemistry Help HERE ONLY !!
« Reply #176 on: May 28, 2009, 03:28:32 pm »
u may get 1 mark
cuz u have to say the release of energy by living cells from food

and By the way LIL WAYNE IS THE BEST RAPPER ALIVE , so stop hating
Ah aite! its 2 marks right

& Lil Wayne is NOT the best rapper alive. Lil Wayne claims he is the best, buh he can't freestyle & has a ghost writer who writes his lyrics! i aint hatin' im jus sayin =P
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Offline Mastermind

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Re: Chemistry Help HERE ONLY !!
« Reply #177 on: May 28, 2009, 03:30:30 pm »
another question ..

Name 2 ways of obtaining hydrogen (on a large scale)?
Wah do you mean? obtaining hydrogen from.....
"Relax & take notes, Imma give you great quotes"

Offline unknown 101

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Re: Chemistry Help HERE ONLY !!
« Reply #178 on: May 28, 2009, 03:34:12 pm »
another question ..

Name 2 ways of obtaining hydrogen (on a large scale)?
Wah do you mean? obtaining hydrogen from.....

i mean how would u obtain a large quaantity of hydrogen ?

and who the hell told u he has a ghost writer (pure bullshit)

Offline Mastermind

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Re: Chemistry Help HERE ONLY !!
« Reply #179 on: May 28, 2009, 03:37:51 pm »
another question ..

Name 2 ways of obtaining hydrogen (on a large scale)?
Wah do you mean? obtaining hydrogen from.....

i mean how would u obtain a large quaantity of hydrogen ?

and who the hell told u he has a ghost writer (pure bullshit)
Oh then, i dont know that answer then =P

Its all over the Internet & it shows in some of his tracks, you could tell when they're his lyrics, cuz....they suck, complete bull ma man, & his voice is the most annoyin of all! dont tell me its unique!
"Relax & take notes, Imma give you great quotes"