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Author Topic: Edexcel CHEMISTRY DOUBTS!!!!  (Read 268230 times)

Offline Romeesa-Chan

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1380 on: June 25, 2011, 06:53:10 pm »
Quote from: The Secret on June 25, 2011, 06:51:28 pm
I have a question guys, for A2 chemistry, do I need to 're-study' the AS modules as well?

If they are fresh in your mind, it'll be good for you.

Just revise them briefly to brush up your AS memory while doing A2! :D
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Offline EMO123

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1381 on: June 25, 2011, 06:53:32 pm »
Quote from: The Secret on June 25, 2011, 06:51:28 pm
I have a question guys, for A2 chemistry, do I need to 're-study' the AS modules as well?
well i say one thing prepare for everything so you dont face problem further
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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1382 on: June 25, 2011, 07:11:24 pm »
Ok, thanks guys.  :)

Another question, I'm going to do A2 privately by myself, what do you recommend: doing it in January or June?
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Offline Romeesa-Chan

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1383 on: June 25, 2011, 10:19:03 pm »
Quote from: The Secret on June 25, 2011, 07:11:24 pm
Ok, thanks guys.  :)

Another question, I'm going to do A2 privately by myself, what do you recommend: doing it in January or June?

How many subjects?
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Offline ~ Miss Relina ~

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1384 on: June 29, 2011, 06:14:34 pm »
guys where can i get units 4,5,6 2010 2011 2009 june and jan papers
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Offline Malak

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1385 on: June 29, 2011, 06:18:49 pm »
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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1386 on: July 02, 2011, 11:58:35 am »
Quote from: Hello-Kitty on June 25, 2011, 10:19:03 pm
How many subjects?

Biology A2 but it's CIE and I'm going to be in my first year of uni as well... it's complicated to explain why am I doing the A2, but I plan to apply in another uni abroad and that's why I need the A-levels, and I'm going to start uni now [as in next semester] because if I don't get to travel abroad, I would have already guaranteed myself a seat in a uni!
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Offline Malak

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1387 on: July 02, 2011, 01:22:14 pm »
Quote from: The Secret on July 02, 2011, 11:58:35 am
Biology A2 but it's CIE and I'm going to be in my first year of uni as well... it's complicated to explain why am I doing the A2, but I plan to apply in another uni abroad and that's why I need the A-levels, and I'm going to start uni now [as in next semester] because if I don't get to travel abroad, I would have already guaranteed myself a seat in a uni!

Depends on how fast you can cover up the syllabus..
Its july already...Maybe give the unit 3 in jan and the unit 4 in june?
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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1388 on: July 02, 2011, 02:27:13 pm »
Quote from: ang3l on July 02, 2011, 01:22:14 pm
Depends on how fast you can cover up the syllabus..
Its july already...Maybe give the unit 3 in jan and the unit 4 in june?

Yeaa, that's what I was thinking of!
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Offline Malak

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1389 on: September 09, 2011, 03:21:50 pm »
Guess I need to revive this thread ::)

Okay, i got a question.

Suggest a suitable experimental tech. for measuring the rate of reaction for:

(a) ethly ethanoate with sodium hydroxide.

(b) copper(II) ions with ammonia molecules.


I know that we cant use the tech. of measuring the gas volume as no gas is given off in both also I cant use change in mass.

Thanks.
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Offline iluvme

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1390 on: September 09, 2011, 04:11:36 pm »
Quote from: Ang3l on September 09, 2011, 03:21:50 pm
Guess I need to revive this thread ::)

Okay, i got a question.

Suggest a suitable experimental tech. for measuring the rate of reaction for:

(a) ethly ethanoate with sodium hydroxide.

(b) copper(II) ions with ammonia molecules.


I know that we cant use the tech. of measuring the gas volume as no gas is given off in both also I cant use change in mass.

Thanks.

I'm not exactly sure since we've not yet covered this section.

How about measuring the decrease in concentrations of ethyl ethanoate and copper (II) ions per unit time and drawing a graph?
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Offline ~ Miss Relina ~

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1391 on: September 09, 2011, 04:53:35 pm »
Quote from: Ang3l on September 09, 2011, 03:21:50 pm
Guess I need to revive this thread ::)

Okay, i got a question.

Suggest a suitable experimental tech. for measuring the rate of reaction for:

(a) ethly ethanoate with sodium hydroxide.

(b) copper(II) ions with ammonia molecules.


I know that we cant use the tech. of measuring the gas volume as no gas is given off in both also I cant use change in mass.

Thanks.

I'm not sure as I have just began studying the unit 4 from a couple of days but I think that this is in the 1st topic of rates   here is a try  :D for
 (a) it could be PH change
 (b) colorimetry due to copper compounds are colored

hope I helped  ;) ahhh By the way Thanks for reviving that thread needed that alot  ;D



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Offline Malak

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1392 on: September 09, 2011, 07:48:22 pm »
^ Well, yeah your answers are right but please if you could explain me.

Why?
Sorry, I can be dumb at times  ::)
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Offline ~ Miss Relina ~

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1393 on: September 09, 2011, 07:54:59 pm »
Quote from: Ang3l on September 09, 2011, 07:48:22 pm
^ Well, yeah your answers are right but please if you could explain me.

Why?
Sorry, I can be dumb at times  ::)
for (a) that reaction you gave gives neutral products Ch3coona+ c2h5oh +h2o so to be able to measure rate the most suitable method  is the PH change due to NaOH being used up so PH may Decrease as nuetral products formed
(b) copper is a transition metal so giving coloerd compound that why we use colorimetry as a blue copper ammonium compound fromed
hope u get it  ;)
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Offline Malak

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Re: Edexcel CHEMISTRY DOUBTS!!!!
« Reply #1394 on: September 09, 2011, 07:56:48 pm »
^ Oh thank you :D get it now  ::)

I really wonder at times how do I pass my exams  ::)
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