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Author Topic: Chemistry paper 1 help  (Read 12299 times)

Offline The Golden Girl =D

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Re: Chemistry paper 1 help
« Reply #15 on: May 24, 2010, 05:22:06 pm »
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Offline Weaam

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Re: Chemistry paper 1 help
« Reply #16 on: May 24, 2010, 05:25:01 pm »
Thanks irfan...  ;)
and golden girl, ill remember the reactivity of the halogens all my life thanks to that!  :D
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Offline The Golden Girl =D

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Re: Chemistry paper 1 help
« Reply #17 on: May 24, 2010, 05:26:09 pm »
Quote from: weaam on May 24, 2010, 05:25:01 pm
Thanks irfan...  ;)
and golden girl, ill remember the reactivity of the halogens all my life thanks to that!  :D

that's thanks to my own weirdness ;) (i'm weird in my own way  :D)

np  8)
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Offline Weaam

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Re: Chemistry paper 1 help
« Reply #18 on: May 24, 2010, 05:27:52 pm »
Quote from: the golden girl on May 24, 2010, 05:26:09 pm
that's thanks to my own weirdness ;) (i'm weird in my own way  :D)

np  8)

Oh cool, i like wierd xD
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-I saw weird stuff in that place last night. Weird, strange, sick, twisted, eerie, godless, evil stuff... and I went in. - Homer
+ Rep me if i have been of any assistance to you ;D

Offline The Golden Girl =D

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Re: Chemistry paper 1 help
« Reply #19 on: May 24, 2010, 05:28:28 pm »
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Offline red_911

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Re: Chemistry paper 1 help
« Reply #20 on: May 24, 2010, 05:30:26 pm »
Quote from: the golden girl on May 24, 2010, 05:19:16 pm
in the halognes ....as u go down the group ,the reactivity decreases hence , Br is the big bro it'll kick Iodine's butt .....but chlorine will kick Bromine's As*  lol  :P
lolxx...i still didnt get it ..  :-\
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holtadit

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Re: Chemistry paper 1 help
« Reply #21 on: May 24, 2010, 05:32:19 pm »
Starting with most reactive:


Fluorine
Chlorine
Bromine
Iodine
Astatine
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Offline The Golden Girl =D

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Re: Chemistry paper 1 help
« Reply #22 on: May 24, 2010, 05:32:31 pm »
Quote from: red_911 on May 24, 2010, 05:30:26 pm
lolxx...i still didnt get it ..  :-\

u kno in the reactivity series the reactivity decreases down the group , so what happens is that ...Br is more reactive than I hence it'll displace it
as for chlorine it's more reactive than Br hence it'll displace it

got it?  ::)
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Offline red_911

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Re: Chemistry paper 1 help
« Reply #23 on: May 24, 2010, 05:35:54 pm »
Quote from: the golden girl on May 24, 2010, 05:32:31 pm
u kno in the reactivity series the reactivity decreases down the group , so what happens is that ...Br is more reactive than I hence it'll displace it
as for chlorine it's more reactive than Br hence it'll displace it

got it?  ::)
yeah i knew abt the reactivity .. bt was kinda confused ...got it now ...Thanks :D
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Offline Weaam

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Re: Chemistry paper 1 help
« Reply #24 on: May 24, 2010, 05:43:59 pm »
Theres this question in oct/nov 04 Q11, that says:
' A substance X is heated in an evaporating basin until there is no further change.
                                             
                                          mass of basin
                      before heating       25.52g
                      after heating         26.63g
What could X be?
A copper
B copper (II) carbonate
C Copper (II) oxide
D Hydrated copper (II) sulphate'
ms says the answer is A, i dunt get it, i thought substances decrease in size or breakdown when heated  :-\
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- The man who smiles when things go wrong has thought of someone to blame it on. - Robert Bloch.
-I saw weird stuff in that place last night. Weird, strange, sick, twisted, eerie, godless, evil stuff... and I went in. - Homer
+ Rep me if i have been of any assistance to you ;D

Offline The Golden Girl =D

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Re: Chemistry paper 1 help
« Reply #25 on: May 24, 2010, 05:44:30 pm »
Quote from: red_911 on May 24, 2010, 05:35:54 pm
yeah i knew abt the reactivity .. bt was kinda confused ...got it now ...Thanks :D
cool  ;)
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holtadit

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Re: Chemistry paper 1 help
« Reply #26 on: May 24, 2010, 05:44:58 pm »
Heating copper will cause it to OXIDISE - ITS MASS INCREASES

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Offline The Golden Girl =D

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Re: Chemistry paper 1 help
« Reply #27 on: May 24, 2010, 05:45:38 pm »
Quote from: weaam on May 24, 2010, 05:43:59 pm
Theres this question in oct/nov 04 Q11, that says:
' A substance X is heated in an evaporating basin until there is no further change.
                                             
                                          mass of basin
                      before heating       25.52g
                      after heating         26.63g
What could X be?
A copper
B copper (II) carbonate
C Copper (II) oxide
D Hydrated copper (II) sulphate'
ms says the answer is A, i dunt get it, i thought substances decrease in size or breakdown when heated  :-\

copper oxidizes when it is not in a compound , got it  ;)
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Offline Weaam

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Re: Chemistry paper 1 help
« Reply #28 on: May 24, 2010, 05:50:27 pm »
Oh yeah, that totally slipped my mind!
Thanks you guys, i owe you one  ;)
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- The man who smiles when things go wrong has thought of someone to blame it on. - Robert Bloch.
-I saw weird stuff in that place last night. Weird, strange, sick, twisted, eerie, godless, evil stuff... and I went in. - Homer
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Offline blackberry

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Re: Chemistry paper 1 help
« Reply #29 on: May 24, 2010, 05:59:15 pm »
y doesnt copper react directly wid hcl to form copper chloride?
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