Salt/Qualitative Analysis for P3 Chemistry

Akshajistari

Akshajistari

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I just feel wrong asking about what will come. My conscience can't handle it

Btw Rizwan Javed could I please have some tips for that last section in Physics Paper 3? The one where they ask for limitations and stuff?
 
techgeek

techgeek

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Should we always expect SO2 to be given off, if we are adding concentrated sulfuric acid?
And how can we quickly identify a gas? I mean I realize a gas is given off after it is given off, so should I test for it by doing the same thing again?
 
Rizwan Javed

Rizwan Javed

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techgeek said:
Should we always expect SO2 to be given off, if we are adding concentrated sulfuric acid?
And how can we quickly identify a gas? I mean I realize a gas is given off after it is given off, so should I test for it by doing the same thing again?
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I don't think so you need to test for the gas. The gases which we encounter in our practicals have characteristic colours or smells. So if you know about this, you'll need not to test for them everytime.
Like CO2, when it evolves, there's too much fizzing like that in a cold drink. Similarly, SO2 has a very disgusting smell :sick:. NO2 has a brown color and if you place your thumb onto the test-tube, the test tube will turn brown! Whenever you are dealing with H2O2, and you add KMnO4, you can expect O2 to evolve. And so. Infact, you don't need to test for every gas. But if you have time, you can test that too for counter checking your results.

Akshajistari said:
Btw Rizwan Javed could I please have some tips for that last section in Physics Paper 3? The one where they ask for limitations and stuff?
Click to expand...
The second question contains a practical where there are so many errors you are bound to face. So while doing the practical, keep thinking about what sort of error/difficult you are facing like in experiments where you are to calculate the max height of the ball after the bounce, it is very difficult to note when the ball reaches it's max height. Side by side also think of the improvements you can bring to the experiment.

Through out this question you should think “Why I am feeling that this is difficult? Why is problem with this experiment? How can I modify it to take better readings?” this critical thinking is very important to do the last part of this question but the observations are made while doing experiment and setting apparatus. The rest depends upon your practice.

Download the practical notes from this website: http://znotes.org/as-physics/
These notes contain some oft-repeated errors and their improvements. These might help you.
 
Akshajistari

Akshajistari

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Rizwan Javed said:
I don't think so you need to test for the gas. The gases which we encounter in our practicals have characteristic colours or smells. So if you know about this, you'll need not to test for them everytime.
Like CO2, when it evolves, there's too much fizzing like that in a cold drink. Similarly, SO2 has a very disgusting smell :sick:. NO2 has a brown color and if you place your thumb onto the test-tube, the test tube will turn brown! Whenever you are dealing with H2O2, and you add KMnO4, you can expect O2 to evolve. And so. Infact, you don't need to test for every gas. But if you have time, you can test that too for counter checking your results.


The second question contains a practical where there are so many errors you are bound to face. So while doing the practical, keep thinking about what sort of error/difficult you are facing like in experiments where you are to calculate the max height of the ball after the bounce, it is very difficult to note when the ball reaches it's max height. Side by side also think of the improvements you can bring to the experiment.

Through out this question you should think “Why I am feeling that this is difficult? Why is problem with this experiment? How can I modify it to take better readings?” this critical thinking is very important to do the last part of this question but the observations are made while doing experiment and setting apparatus. The rest depends upon your practice.

Download the practical notes from this website: http://znotes.org/as-physics/
These notes contain some oft-repeated errors and their improvements. These might help you.
Click to expand...
Thank you!
 
HELLNO

HELLNO

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Tousif Islam Pronoy said:
I am taking chemistry practical 32
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They will give you Magnesium ribbon and HCl you will react them together, find the volume of H2 evolved using that apparatus and then neutralise the HCl that didnt react with NaOH. To find the number if moles you will use stoichiometry.
 
Zarak Asad Khan

Zarak Asad Khan

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Hi, I'm gonna be appearing for my AS chemistry practical tomorrow and I wanna ask if there's anything we need to actually memorize for the practical. There's a data sheet given for the observations and all. What other things do we ought to have memorized for the exam? Any help would be great thanks !
 
HELLNO

HELLNO

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Zarak Asad Khan said:
Hi, I'm gonna be appearing for my AS chemistry practical tomorrow and I wanna ask if there's anything we need to actually memorize for the practical. There's a data sheet given for the observations and all. What other things do we ought to have memorized for the exam? Any help would be great thanks !
Click to expand...
Read the chapter practical skills from the chemistry text book last edition (second edition) Go through mark schemes and examiner reports so that you get aware of people's common mistakes!
 
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