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Author Topic: Chemistry'10 paper 3. PLEASE HELP IF YOU CAN :-[  (Read 5720 times)

Offline Helium

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Re: Chemistry'10 paper 3. PLEASE HELP IF YOU CAN :-[
« Reply #15 on: June 05, 2010, 04:12:26 pm »
Quote from: mohit1234 on June 05, 2010, 04:11:03 pm
i think someone did
look here


LOL looks like i'm blind :-[
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Offline mohit1234

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Re: Chemistry'10 paper 3. PLEASE HELP IF YOU CAN :-[
« Reply #16 on: June 05, 2010, 04:14:39 pm »
Quote from: Helium on June 05, 2010, 04:12:26 pm
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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Offline J.Darren

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Re: Chemistry'10 paper 3. PLEASE HELP IF YOU CAN :-[
« Reply #17 on: June 05, 2010, 06:30:19 pm »
Quote from: mohit1234 on June 05, 2010, 01:16:41 pm
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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Offline NeoMarmar

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Re: Chemistry'10 paper 3. PLEASE HELP IF YOU CAN :-[
« Reply #18 on: June 05, 2010, 06:36:38 pm »
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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Offline soulreapr_ninja

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Re: Chemistry'10 paper 3. PLEASE HELP IF YOU CAN :-[
« Reply #19 on: June 06, 2010, 01:00:00 pm »
June 2009 question # 5(b) How do i find the formual of the T phosphate thingy?? ??? :-\
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Offline mohit1234

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Re: Chemistry'10 paper 3. PLEASE HELP IF YOU CAN :-[
« Reply #20 on: June 06, 2010, 01:46:59 pm »
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Offline lulu10

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Re: Chemistry'10 paper 3. PLEASE HELP IF YOU CAN :-[
« Reply #21 on: June 07, 2010, 09:15:58 am »
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. ::)
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