Edexcel CHEMISTRY DOUBTS!!!!

[dk bose]

seems, that no one is able to answer my question or doesnt want to answer it?

[The Golden Girl =D]

hey,people!! could anyone try to solve my this doubt???the question is as follows-

(a)Aluminium is extracted by electrolysis of Al₂O₃.What is the maximum mass of the metal that could be obtained from 1 tonne of the oxide?
(b)If the yield of the electrolysis plant is 90%,what mass of the oxide must be used to produce 1 tonne of aluminium?

Can someone answer his doubt please =]

* I forgot the AS  Chemistry calculations  -.- *

[Malak]

seems, that no one is able to answer my question or doesnt want to answer it?

There should be some sort of an equation? 

[~ Miss Relina ~]

I've seen this QUESTION before and it made me go from this to this >.<

Anyways one sec,

firstly I'm ONLY doing Unit 4 so I've very sorry but if it's Unit 5 then I'm not the one to answer 


What I know is that KMnO4 is an oxidizing agent so the Oh groups will disappear but that's all I can answer you for now.


I hope I helped =]

ya it did same to me 

what kind of question is this
anyways Thanks alot

[The Golden Girl =D]

lol

IKR -.-

You're Welcome =]

[~ Miss Relina ~]

@GG; this question may be yours now.... go ahead if you're free ofcourse   

attached also mark scheme is attached if anyone needs it ........ how did he get the no.of moles of the weak acid
 Q 2 (d) iii

[The Golden Girl =D]

I've been thinking about it for the past few minutes so I'll tell you what I came up with.

10 cm³ of NaOH reacted with 25 cm³ of the Weak acid ,so * if I subtract the 10 from the 25 then it'd be 15 cm³ remaining volume of weak acid.

*Why I subtracted it without feeling that I did something wrong is that in terms of concentration the ratio of the Weak acid to the Base is 1:1

so (15/1000 dm³) * (0.1 moldm^-3) = 0.0015 moles

^ that could be a possibility , but not sure if it's right.

I hope I helped =]

[~ Miss Relina ~]

I've been thinking about it for the past few minutes so I'll tell you what I came up with.

10 cm³ of NaOH reacted with 25 cm³ of the Weak acid ,so * if I subtract the 10 from the 25 then it'd be 15 cm³ remaining volume of weak acid.

*Why I subtracted it without feeling that I did something wrong is that in terms of concentration the ratio of the Weak acid to the Base is 1:1

so (15/1000 dm³) * (0.1 moldm^-3) = 0.0015 moles

^ that could be a possibility , but not sure if it's right.

I hope I helped =]

Thanks .........that's a good possibility but wait ............mmmmm....I think the buffer id formed ofweak acid/weak base andits conjucate acid/ base so NaOH is a strong acid .................well never mind I wrote what I thought at the moment right now    they're annoying me


but anyways I loved your possibilty and I'll accept it 

[The Golden Girl =D]

NaOH is a Base By the way

Thanks ,I'm honored =D

[~ Miss Relina ~]

NaOH is a Base By the way

Thanks ,I'm honored =D

that's the evil question effect on me 


By the way, did you prepared yourself for unit 4 practical or not yet

[The Golden Girl =D]

Oops.

Not yet :$

[~ Miss Relina ~]

guys a question plz

if an aqueous sodium nitrite, NaNO2 and added to it 10 drops of sulphuric acid in a conical flask
then from a burette containing potassium manganate titration is carried out  .............

observation:
blue solution
brown gas

why   explain the observation plz

5NO2–(aq) + 2MnO4–(aq) + 6H+(aq) ? 5NO3–(aq) + 2Mn2+(aq) + 3H2O(l)

[jackfos92]

is phenol soluble in ethanoic acid?

if yes, is it more soluble than water?

[dk bose]

hey,people!! could anyone try to solve my this doubt???the question is as follows-

(a)Aluminium is extracted by electrolysis of Al₂O₃.What is the maximum mass of the metal that could be obtained from 1 tonne of the oxide?
(b)If the yield of the electrolysis plant is 90%,what mass of the oxide must be used to produce 1 tonne of aluminium?

This is a question from the edexcel AS chemistry revision guide,from the end of the first chapter's "Practice exam questions"!!
Could plzz someone solve this question and give me the solutions as fast as possible!!

[AS01]

I want the workbook of moles formula and equation from Ed excel site. It is blocked so can you please tell me how can I get access to it?