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Author Topic: Chemistry Help HERE ONLY !!  (Read 106266 times)

Q80BOY

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Chemistry Help HERE ONLY !!
« on: May 21, 2009, 06:22:57 pm »
hey guys,

as the chemsitry exam is on the 1st of june, u must all be revising, and u MUST have some questions,

so if u have any CHEMISTRY questions, post them here and hopefully some one will help.

Gd Luck  :)

« Last Edit: May 23, 2009, 11:00:29 am by angell »
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Offline Roza

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Re: Chemistry Help HERE ONLY !!
« Reply #1 on: May 21, 2009, 08:42:22 pm »
for now i think i'm confident in wat i've studied for chemistry
nd its on the 1st of junee thats a loooong time still
lollzz ;D ;D
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Offline annie_angel

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Re: Chemistry Help HERE ONLY !!
« Reply #2 on: May 21, 2009, 09:49:55 pm »
i hav a question...if the question has an acid and a base given and they mention tht water IS the acid and they ask Y does water behaves like acid....wat is the answer and plz briefly explain
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Offline angell

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Re: Chemistry Help HERE ONLY !!
« Reply #3 on: May 21, 2009, 10:02:02 pm »
I think because acids are proton doners or hydrogen donor....and water has hydrogen :S:S im sorry i havent touched chem since p6 so f orgotten all of it

:P!
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Offline twilight

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Re: Chemistry Help HERE ONLY !!
« Reply #4 on: May 21, 2009, 10:03:51 pm »
yeah i think thats rite .. bcoz it has H+ in its molecule .. so its a hydrogen donor just like an acid
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Offline sanity_master

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Re: Chemistry Help HERE ONLY !!
« Reply #5 on: May 21, 2009, 11:57:14 pm »
it acts as an acid because it acts as a proton donor.
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Offline sweetsh

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Re: Chemistry Help HERE ONLY !!
« Reply #6 on: May 22, 2009, 03:39:47 am »
Good start Q80BOY
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Offline examsaresoon

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Re: Chemistry Help HERE ONLY !!
« Reply #7 on: May 22, 2009, 05:00:39 am »
Hey! I have a question...

In the production of Aluminum, Sodium Hydroxide is used to separate Aluminum Oxide from the impurities in bauxite ore. The Main impurity in the ore is Iron(3) Oxide. Aluminum Oxide is an amphoteric oxide whilst Iron(3) Oxide us a basic oxide.
Suggest how these two oxides can be separated by the addition of aqueous Sodium Hydroxide.
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Offline shaxter8

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Re: Chemistry Help HERE ONLY !!
« Reply #8 on: May 22, 2009, 08:56:39 am »
Hey, could you pls send me the chem & physics resources you were talking about?

My Email is:     aum8888@gmail.com

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Q80BOY

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Re: Chemistry Help HERE ONLY !!
« Reply #9 on: May 22, 2009, 09:02:52 am »
Quote from: shaxter8 on May 22, 2009, 08:56:39 am
Hey, could you pls send me the chem & physics resources you were talking about?

My Email is:     aum8888@gmail.com



i sent u one,

and plz guys, this thread is for questions and answers ONLY, if u need any resources post ur requests in the main thread,

thanks
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Offline crypsAnity

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Re: Chemistry Help HERE ONLY !!
« Reply #10 on: May 22, 2009, 09:05:42 am »
I love Chemistry .. only subject im good at .. lol .. right Water acts as an acid.. because well yeah its a proton donor.. also remember the fact its sort of amphoteric.. it can both donate or accept.. at different cases ..
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Offline crypsAnity

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Re: Chemistry Help HERE ONLY !!
« Reply #11 on: May 22, 2009, 09:09:33 am »
Quote from: examsaresoon on May 22, 2009, 05:00:39 am
Hey! I have a question...

In the production of Aluminum, Sodium Hydroxide is used to separate Aluminum Oxide from the impurities in bauxite ore. The Main impurity in the ore is Iron(3) Oxide. Aluminum Oxide is an amphoteric oxide whilst Iron(3) Oxide us a basic oxide.
Suggest how these two oxides can be separated by the addition of aqueous Sodium Hydroxide.

Yeah because you see.. Aluminum Oxide is Amphoteric..so with the addition of Sodium Hydroxide it would react with aluminium oxide.. leaving behind Iron Oxide.. therefore seperating em.. hmmm hope it helped ..
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Offline crypsAnity

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Re: Chemistry Help HERE ONLY !!
« Reply #12 on: May 22, 2009, 09:11:11 am »
p.s and yes as iron oxide is basic it would definitely not react with NAOH ..
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Offline Shogun

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Re: Chemistry Help HERE ONLY !!
« Reply #13 on: May 22, 2009, 03:02:06 pm »
Quote from: annie_angel on May 21, 2009, 09:49:55 pm
i hav a question...if the question has an acid and a base given and they mention tht water IS the acid and they ask Y does water behaves like acid....wat is the answer and plz briefly explain

water if u see it in the product side it will loose one hydrogen. therefore acids tend to loose protons(h+) ions and give it to bases. so u see water behaves like acid as it GIVES or DONATES  protons
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Offline annie_angel

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Re: Chemistry Help HERE ONLY !!
« Reply #14 on: May 22, 2009, 05:29:23 pm »
thnak u all!!!tht waz seriously a gud help!!!
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