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Author Topic: CHEMISTRY PAPER 1 HERE  (Read 38449 times)

Offline hashandgreen

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Re: CHEMISTRY PAPER 1 HERE
« Reply #120 on: June 11, 2009, 01:26:28 pm »
the answer is ''A'',because,the number of molecules for successful collisions are less and also if the acid is less concentrated,the number of molecules in the same volume present,are less,and hence,less number of successful collisions in the same period of time,and hence,a slower reaction rate.
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Offline girl_92

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Re: CHEMISTRY PAPER 1 HERE
« Reply #121 on: June 11, 2009, 01:27:47 pm »
Quote from: hashandgreen on June 11, 2009, 01:26:28 pm
the answer is ''A'',because,the number of molecules for successful collisions are less and also if the acid is less concentrated,the number of molecules in the same volume present,are less,and hence,less number of successful collisions in the same period of time,and hence,a slower reaction rate.
[/quote
this is an ans to which que
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Offline solo_G

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Re: CHEMISTRY PAPER 1 HERE
« Reply #122 on: June 11, 2009, 01:28:18 pm »
ppl i wud b verry gratful if any1 cud tell me whether aluminium oxide is soluble in water????? ???
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Offline esso

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Re: CHEMISTRY PAPER 1 HERE
« Reply #123 on: June 11, 2009, 01:30:27 pm »
Quote from: mena mustafa on June 11, 2009, 01:28:18 pm
ppl i wud b verry gratful if any1 cud tell me whether aluminium oxide is soluble in water????? ???

no it is not soluble
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Offline MR.BooMBastiC

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Re: CHEMISTRY PAPER 1 HERE
« Reply #124 on: June 11, 2009, 01:35:51 pm »
Quote from: esso on June 11, 2009, 01:30:27 pm
Quote from: mena mustafa on June 11, 2009, 01:28:18 pm
ppl i wud b verry gratful if any1 cud tell me whether aluminium oxide is soluble in water????? ???

no it is not soluble

aluminium is soluble!!!
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Offline solo_G

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Re: CHEMISTRY PAPER 1 HERE
« Reply #125 on: June 11, 2009, 01:42:19 pm »
hmmm sooo is it soluble or insoluble???
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Offline cool_dude

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Re: CHEMISTRY PAPER 1 HERE
« Reply #126 on: June 11, 2009, 01:45:31 pm »
Quote from: mena mustafa on June 11, 2009, 01:42:19 pm
hmmm sooo is it soluble or insoluble???

Hydrated aluminium oxide is readily soluble in acids or alkalies
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Offline Tammy

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Re: CHEMISTRY PAPER 1 HERE
« Reply #127 on: June 11, 2009, 01:48:39 pm »
It's not soluble!!!
I know I saw the question in one of the old pastpapers and asked my teacher and he said it's insoluble  ;D
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Offline sundars

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Re: CHEMISTRY PAPER 1 HERE
« Reply #128 on: June 11, 2009, 01:53:03 pm »
guys aluminum hydrous oxide is soluble in acids but not in water
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Offline Clem

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Re: CHEMISTRY PAPER 1 HERE
« Reply #129 on: June 11, 2009, 02:11:44 pm »
Guuuyysss can someone please help me with november 2007 no. 21, shouldnt' it form a blue percepitate??
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Offline girl_92

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Re: CHEMISTRY PAPER 1 HERE
« Reply #130 on: June 11, 2009, 02:15:04 pm »
Quote from: Clem on June 11, 2009, 02:11:44 pm
Guuuyysss can someone please help me with november 2007 no. 21, shouldnt' it form a blue percepitate??

only cu sulfate is blue not all compounds of copper are blue
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Offline girl_92

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Re: CHEMISTRY PAPER 1 HERE
« Reply #131 on: June 11, 2009, 02:18:42 pm »
Quote from: madee on June 11, 2009, 02:15:04 pm
Quote from: Clem on June 11, 2009, 02:11:44 pm
Guuuyysss can someone please help me with november 2007 no. 21, shouldnt' it form a blue percepitate??

only cu sulfate is blue not all compounds of copper are blue
did u get it now
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Offline sundars

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Re: CHEMISTRY PAPER 1 HERE
« Reply #132 on: June 11, 2009, 02:19:22 pm »
The answer is C
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Offline Bani

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Re: CHEMISTRY PAPER 1 HERE
« Reply #133 on: June 11, 2009, 02:32:24 pm »
Quote from: sundars on June 11, 2009, 02:19:22 pm
The answer is C

heyy, please help....
O/N 2007, paper 1, Q 11
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Offline esso

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Re: CHEMISTRY PAPER 1 HERE
« Reply #134 on: June 11, 2009, 02:34:49 pm »
An aqueous solution contains barium iodide.
It is possible to obtain a solution that contains Ba2+(aq) but no I–(aq) by adding ……1…… until no
more ……2…… precipitate forms.

Which words correctly complete gaps 1 and 2?
1                                             2
A aqueous lead(II) nitrate         white
B aqueous lead(II) nitrate         yellow
C dilute sulphuric acid               white
D dilute sulphuric acid               yellow


help please...need an explanation..
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