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AS Chemistry- helping each other out!

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Original post by TARS
Type/write notes in your own words. Then do every single past paper.

Make a Microsoft Excel document with all of your exam marks, and have a column for each chapter, where you can add notes for things you do not understand. It really helps.

Like this:



Oh my gosh, you're very creative! I may sound naïve but how do you think of these things? You all seem so dedicated and prepared- I don't even have time to do this because I somehow entered a sad position. But I've started studying and 'learning' the content now.
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TARS
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Original post by Cherry82
Oh my gosh, you're very creative! I may sound naïve but how do you think of these things? You all seem so dedicated and prepared- I don't even have time to do this because I somehow entered a sad position. But I've started studying and 'learning' the content now.


It was my physics teacher's idea really, but I just did it and tried it out and it seemed to work so i continued it for all past papers
Original post by Cherry82
Thanks for the link :smile:
But honestly, if someone purely used past papers without learning or reading the content from the book- what grade could they receive as these questions seem almost recycled. Say if I did 20 past papers- could I get maybe grade B through only doing that and looking at mark schemes?


there's nothing stopping you get 75+ doing that, i'd say there's 5 marks max of new stuff per paper
Original post by BBeyond
there's nothing stopping you get 75+ doing that, i'd say there's 5 marks max of new stuff per paper


Isn't the paper out of 60 though, or is this in the sense of UMS points or something? But really, this sounds too simple though. If it was that easy why isn't everyone doing this? lol- this would be very risky for someone like me who wasn't gone through the whole book and who doesn't know the pieces of the content...
I don't know why but I really hate that official study guide ocr set students. Actually I think it's due to the fact that it doesn't really point out things, there's just large pieces of content without highlighted, underlined info. I had to buy another study guide.
Original post by Cherry82
Isn't the paper out of 60 though, or is this in the sense of UMS points or something? But really, this sounds too simple though. If it was that easy why isn't everyone doing this? lol- this would be very risky for someone like me who wasn't gone through the whole book and who doesn't know the pieces of the content...
I don't know why but I really hate that official study guide ocr set students. Actually I think it's due to the fact that it doesn't really point out things, there's just large pieces of content without highlighted, underlined info. I had to buy another study guide.


Because you still have to learn the answers and its much harder to learn the answers when you don't even understand the concept hence why past papers are usually the kinda thing an A grade student does for full ums rather than a D grade student for a B.also most don't use them correctly and it can be quite time consuming.

For my biology mock I did 1 past paper for practice and it helped for around 20 marks/80, plus 1 of the questions was a exact copy.


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Original post by lyricalvibe
Because you still have to learn the answers and its much harder to learn the answers when you don't even understand the concept hence why past papers are usually the kinda thing an A grade student does for full ums rather than a D grade student for a B.also most don't use them correctly and it can be quite time consuming.

For my biology mock I did 1 past paper for practice and it helped for around 20 marks/80, plus 1 of the questions was a exact copy.


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Wait, so sorry no offence but what's the point you're making? That past papers do or do not help depending on?
Original post by Cherry82
Wait, so sorry no offence but what's the point you're making? That past papers do or do not help depending on?


Oh sorry, I was replying to the, "if its that easy why doesn't everyone do it" :colondollar:
I personally find them really useful, but I only like using them in conjunction with revision guides.

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Original post by lyricalvibe
Oh sorry, I was replying to the, "if its that easy why doesn't everyone do it" :colondollar:
I personally find them really useful, but I only like using them as a supplement to revision guides.

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Oh, I understand now. There's been previous articles though on OCR doing this- using old past paper questions like from 2004 in recent papers. I remember reading an article or something- this was like in 2012. How students who did the 2002 past paper got 10 marks free for their A2 exam. Now that it's been raised, I'm sure OCR wouldn't do this again but those students were lucky.
Original post by Cherry82
Oh, I understand now. There's been previous articles though on OCR doing this- using old past paper questions like from 2004 in recent papers. I remember reading an article or something- this was like in 2012. How students who did the 2002 past paper got 10 marks free for their A2 exam. Now that it's been raised, I'm sure OCR wouldn't do this again but those students were lucky.


Are you OCR B? My teachers said its quite likely this'll happen as its the last year for the spec, are you planning on looking at old spec stuff?

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Original post by lyricalvibe
Are you OCR B? My teachers said its quite likely this'll happen as its the last year for the spec, are you planning on looking at old spec stuff?

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Oh no OCR A. OCR B seems more interesting, wish we did it. Really? They're probably right but who knows.
I was just thinking since it's the last official year for this type of A level- maybe they might do so. I mean we still have resit exams in 2016 specialised for our year only but I doubt that they would want many students to resit the paper next year so maybe the paper this year papers wouldn't be that hard or surprising. Now, this isn't exactly a good thing as it could lead to high grade boundaries. Ah, it's 50/50. All of us would get As only in my dreams lol Anything could happen this year.
Original post by blueberry389
when you say sth is being oxidised or reduced, do you say the element of the compound or the compound?
e.g. the S in SO2 is reduced / SO2 is reduced?

thank you! :smile:


The sulfur element is being reduced because you're talking about the oxidation state of sulfur only.
SO2 - O = -2 x 2 = -4 so S = +4 :smile:
When I am talking about acidified potassium dichromate (IV) orange to green chromium (III) ions would I be right in saying the potassium dichromate is REDUCED to chromium ions?
Hi guys, I have produced a glossary of terms for F321 mod-1 (atoms and reactions) if you want to have a look. Thanks.

http://www.thestudentroom.co.uk/g/resources/ocr_chem_a_f321_module_1_atoms_and_reactions_glossary
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Avatar for Dinaa
Dinaa
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Hi :smile:

I'm a tiny bit confused about the investigation for the ease of decomposition for Carbonates.

I understand the procedure.

But why are we using this apparatus? What are we observing? How long it takes for the lime water to become cloudy, due to the CO2 formed in the equation:

MCO3 --> MgO + CO2

Is the experiment for all carbonates?
I thought aqueous Ca(CO3) is lime water.. So why are we using this?

Lol ok maybe not a 'tiny' bit confused :colondollar:
Original post by Dinaa
Hi :smile:

I'm a tiny bit confused about the investigation for the ease of decomposition for Carbonates.

I understand the procedure.

But why are we using this apparatus? What are we observing? How long it takes for the lime water to become cloudy, due to the CO2 formed in the equation:

MCO3 --> MgO + CO2

Is the experiment for all carbonates?
I thought aqueous Ca(CO3) is lime water.. So why are we using this?

Lol ok maybe not a 'tiny' bit confused :colondollar:


Yes it is how long it takes for the lime water to become cloudy to compare the time taken for decomposition between two carbonates.
Ca(OH)2 (aq) is lime water. When CO2 is passed through it reacts like this Ca(OH)2 (aq) + CO2 --> CaCO3 (s) + H2O. CaCO3 is the white precipitate.


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Original post by samwillettsxxx
When I am talking about acidified potassium dichromate (IV) orange to green chromium (III) ions would I be right in saying the potassium dichromate is REDUCED to chromium ions?


Yah. The compound has been reduced, therefore reduction has occurred. We don't worry too much about the potassium, we treat it as a spectator ion.

I can see why you'd be hesitant to call it reduction, because that would imply that everything in the chromate (inc. the oxygen) is being reduced. It would be more accurate to say that the chromium in the chromate is being reduced, but saying that the 'chromate has been reduced' is still deemed more than acceptable.

Source: Bossed A2 Chem.
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Dinaa
OP
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Original post by C0balt
Yes it is how long it takes for the lime water to become cloudy to compare the time taken for decomposition between two carbonates.
Ca(OH)2 (aq) is lime water. When CO2 is passed through it reacts like this Ca(OH)2 (aq) + CO2 --> CaCO3 (s) + H2O. CaCO3 is the white precipitate.


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That's a superb explanation!

Thank you again :blushing:
Original post by Dinaa
That's a superb explanation!

Thank you again :blushing:


Np! Happy to help :tongue:


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I have been researching to try and find the correct way to convert a number from mol/dm^3 to g/dm^3 but I am really struggling. Which is the correct way to do it accurately?
Could you provide an exam so I can see how you do it.
thanks
Yes, me !

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