IGCSE/GCSE/O & A Level/IB/University Student Forum
Qualification => Subject Doubts => IGCSE/ GCSE => Sciences => Topic started by: lulu10 on June 05, 2010, 09:01:35 am
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GUYS,
im going absolutely crazy :|.
How do you kno when the electrolyte is molten, aqeous or dilute.
EXAMPLE: JUNE'09 Q2. :-[ :-[ :-[ :-[ :-[ :-[
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if the electrolyte is molten it's used up e.g molten lead bromide Pb+ at cathode and Br- at anode
if aqueous or dilute they're both the same they have the same but extra two ions
e.g aqueous or dilute sodium chloride they have Na+ Cl- and H+ OH- from water
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can any 1 tell me the structure of but-2-ene
reply me ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? :'( :'( :'( :'( :'( :'( :'( :'( :'( :'( :'( :'( :'( :'( :'(
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here is a pic
sorry fr the bad drawing :P
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here is a pic
sorry fr the bad drawing :P
how about poly - but-2-ene ?
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how about poly - but-2-ene ?
Sorry for my appalling drawing! :D
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Sorry for my appalling drawing! :D
hey
wont polybut-2-ene
hav the same structure as polybutene
???
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hey
wont polybut-2-ene
hav the same structure as polybutene
???
Nah, it would be slightly different. This is poly(but-1-ene).
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Nah, it would be slightly different. This is poly(but-1-ene).
whoa
how can u make the diffrence???
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whoa
how can u make the diffrence???
Because the double bond in the monomer of but-1-ene and but-2-ene is different, so obviously the monomers for them are slightly different.
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can someone list the name of those -ene?
if i'm not wrong, it depends on how many carbon(s) did they have, doesn't it?
and what are the difference between alkene(methene,buthene,etc), alkane (methane,buthane,etc), alcohol (methanol, etc), and others (i forget the rest)?
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can someone list the name of those -ene?
if i'm not wrong, it depends on how many carbon(s) did they have, doesn't it?
and what are the difference between alkene(methene,buthene,etc), alkane (methane,buthane,etc), alcohol (methanol, etc), and others (i forget the rest)?
ethene C2H4
propene C3H6
butene C4H8
pentene C5H10
Hexene C6H12
Septene C7H14
Octene C8H16
theres no methene cos CH2 cannot exist
alkenes have a double bond
alkanes dont hve a double bond
Alkanes formula - CnH2n+2
Alkenes formula - CnH2n
Alcohols formula - CnH2n+1OH
Carboxylic Acids formula - CnH2n+1COOH
Anything else??
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thank you!! :D
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NEVER MIND
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No one answered lulu's question.
I'll look into it :D
i think someone did
look here
if the electrolyte is molten it's used up e.g molten lead bromide Pb+ at cathode and Br- at anode
if aqueous or dilute they're both the same they have the same but extra two ions
e.g aqueous or dilute sodium chloride they have Na+ Cl- and H+ OH- from water
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i think someone did
look here
LOL looks like i'm blind :-[
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LOL looks like i'm blind :-[
dont worry it happens sometimes :)
its happened to me also sometimes, i just look again b4 i post ;)
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ethene C2H4
propene C3H6
butene C4H8
pentene C5H10
Hexene C6H12
Septene C7H14
Octene C8H16
theres no methene cos CH2 cannot exist
alkenes have a double bond
alkanes dont hve a double bond
Alkanes formula - CnH2n+2
Alkenes formula - CnH2n
Alcohols formula - CnH2n+1OH
Carboxylic Acids formula - CnH2n+1COOH
Anything else??
Esters.
Single bond - saturated
Double bond - unsaturated
Alkenes - Test : Bromine water would turn from brown to colourless when added to alkenes.
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Test for alcohols (please tell me if I'm wrong) - add alcohol to acidified potassium dichromate (VI) and warm in water bath. The solution turns green if it's positive.
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June 2009 question # 5(b) How do i find the formual of the T phosphate thingy?? ??? :-\
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ive answered it here
https://studentforums.biz/index.php/topic,1411.msg249826.html#msg249826
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guys, i've done A LOT of papers and this is what seems to come up most:
-Contact process
-harber process
- extraction of metals
- Electroylsis
-uses of sulfur dioxide
-how sulfur trioxide is formed
- fertilisers
- moles!
- how do u make sulfuric acid from SO3
-AIR + WATER!
-thermal decomposition (remember ONLY Group I metal nitartes decompose to give metal nitrite and oxygen gas)
anyone want to add to that?
feel free to. ::)