OCR Chemistry 2013-2014 Evaluative Task?

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talhabutt
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#1
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#1
Anyone done the chemistry evaluative task, its to do with 'volume of gas evolved'? I would really appreciate if anyone helped out with what content to revise, any specifics and any links to websites will be really appreciated!
Thanks
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PhRose
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#2
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#2
make sure you learn moles really good in particular v=m*24
also know how to answer stupid questions like why was the volume lower then expected- it got dissolved into the solution etc
try a specimen paper heres the link for it
http://www.ocr.org.uk/Images/67673-u...k-specimen.pdf
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DS_DOOM
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#3
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#3
(Original post by PhRose)
make sure you learn moles really good in particular v=m*24
also know how to answer stupid questions like why was the volume lower then expected- it got dissolved into the solution etc
try a specimen paper heres the link for it
http://www.ocr.org.uk/Images/67673-u...k-specimen.pdf
Are there any equations we need to know?

Thanks
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khiz
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#4
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#4
(Original post by DS_DOOM)
Are there any equations we need to know?

Thanks
Yes, M=v(dcm3)/24
Moles=concentration x volume (dm3)
Mass=Mr x moles
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DS_DOOM
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#5
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#5
(Original post by khiz)
Yes, M=v(dcm3)/24
Moles=concentration x volume (dm3)
Mass=Mr x moles
(Original post by PhRose)
make sure you learn moles really good in particular v=m*24
also know how to answer stupid questions like why was the volume lower then expected- it got dissolved into the solution etc
try a specimen paper heres the link for it
http://www.ocr.org.uk/Images/67673-u...k-specimen.pdf
Thanks!
What about equations such as Metal Carbonate + H2S04 ?



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khiz
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#6
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#6
(Original post by DS_DOOM)
Thanks!
What about equations such as Metal Carbonate + H2S04 ?



Have you done it yet just did it today worst thing you will ever do
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DS_DOOM
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#7
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#7
(Original post by khiz)
Have you done it yet just did it today worst thing you will ever do
Yeah I did it today, I thought it was okay though. What score did you get?
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khiz
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#8
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#8
(Original post by DS_DOOM)
Yeah I did it today, I thought it was okay though. What score did you get?
Well they are marking it over the weekend and marks should be with us for Tuesday. However the other class got their results and the average was 5 and highest was 11
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DS_DOOM
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#9
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#9
(Original post by khiz)
Well they are marking it over the weekend and marks should be with us for Tuesday. However the other class got their results and the average was 5 and highest was 11
Oh okay, that's a pretty low average :curious:
Got my mark today, and I got 15/15!
Think I may have been the only one in my class to get it!
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khiz
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#10
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#10
(Original post by DS_DOOM)
Oh okay, that's a pretty low average :curious:
Got my mark today, and I got 15/15!
Think I may have been the only one in my class to get it!
Wow, I cannot possibly get that, because before the test i aksed my teacher whether CO2 was soluble and he said no, and one of the answers was about the solubility of CO2:mad:

But congrats on that result that is amazing!!
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zoroxluffy
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#11
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#11
Can you tell what sort of questions were in there? It will be a big help....
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lilmizh05
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#12
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#12
I have my qualitative practical tomorrow. Is it hard? (OCR A)
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DS_DOOM
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#13
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#13
(Original post by zoroxluffy)
Can you tell what sort of questions were in there? It will be a big help....
Hmm from what I can remember, there was definitely a percentage error question so make sure you know the formula for that.

There was also questions on moles, watch out for ratios!

Biggest tip though : 3 SIGNIFICANT FIGURES. make sure you're comfortable using that.

Good luck! :grin:
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sophie238
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#14
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#14
Is there any weird questions like question (d) from the specimen paper like
(d) The students decided that the experiment could be carried out more accurately if both the procedure and measuring apparatus were modified.
(i) Draw a labelled diagram to show how the carbonate and acid could be reacted together without needing to remove the bung from the flask.
(ii) Suggest another modification to the general procedure that would produce more reliable and accurate results.

Cause I have literally no idea how to answer/draw that
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stazbowie
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#15
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#15
Is it very different from the specimen paper?
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sixthformer123
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#16
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#16
hi there, is there any formula's i need to know and is there any actual scientific knowledge i need to know e.g. definitions
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DS_DOOM
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#17
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#17
It's pretty similar to the specimen paper. Make sure you know how MgCO3 reacts with acids.
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TommyFidler123
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#18
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#18
has anyone done the one of enthalpy changes yet?
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ayesha_17
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#19
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#19
I am doing the enthalpy evaluative task tomorrow! Please can someone help me on calculating percentage uncertainties I don't know what to do when combining them. Thanks.


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bobbricks
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#20
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#20
I've got it in a few days...Is there anything on procedural errors and what's that question on the solubility of CO2 about?
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