evaluating different methods for determining a formula Watch

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eggfriedrice
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A2 coursework evaluative last chance.

I know discussion of any questions/answers is prohibited.

The title just isn't giving me much so I was wondering if the chemists of TSR could brain storm some ideas for me to revise? (:
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shengoc
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(Original post by eggfriedrice)
A2 coursework evaluative last chance.

I know discussion of any questions/answers is prohibited.

The title just isn't giving me much so I was wondering if the chemists of TSR could brain storm some ideas for me to revise? (:
what are you expected to know, first and foremost?
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eggfriedrice
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(Original post by shengoc)
what are you expected to know, first and foremost?
Hmm, well to find a formula the methods I've learnt are titrations, thermal decomposition and precipitation reactions.

I've read up on titrations and thermal decomposition but no idea how precipitation reactions can be used to find a formula, I thought it just helped identify the ions in the solution. :s

Since it's evaluation, I have you evaluate the methodology, what are some general things I can say? I do physics, and for physic tasks we just say "repeat experiments, use more accurate measuring devices" but I'm never too sure with chemistry. :s like how can you heat something more reliably when doing thermal decomposition? Etc
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shengoc
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(Original post by eggfriedrice)
Hmm, well to find a formula the methods I've learnt are titrations, thermal decomposition and precipitation reactions.

I've read up on titrations and thermal decomposition but no idea how precipitation reactions can be used to find a formula, I thought it just helped identify the ions in the solution. :s

Since it's evaluation, I have you evaluate the methodology, what are some general things I can say? I do physics, and for physic tasks we just say "repeat experiments, use more accurate measuring devices" but I'm never too sure with chemistry. :s like how can you heat something more reliably when doing thermal decomposition? Etc
the same skills work for chemistry. likewise in titrations, you repeat till you get a consistent set of readings, or if they differ by one decimal place after couple of repeated runs, then you take the average to reduce random errors.

a lot of practical course questions are incredibly straight forward and they just require a little bit of critical thinking. it should be things that you can figure out based on what you already know, from my experience.
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eggfriedrice
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(Original post by shengoc)
the same skills work for chemistry. likewise in titrations, you repeat till you get a consistent set of readings, or if they differ by one decimal place after couple of repeated runs, then you take the average to reduce random errors.

a lot of practical course questions are incredibly straight forward and they just require a little bit of critical thinking. it should be things that you can figure out based on what you already know, from my experience.
From my experience the answers are always too straight forward or very picky, hence I always drop marks. I'm either thinking too simply or over complicating things ):
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FatFerreroRocher
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Have you had the ISA yet, as I have the same one on Wednesday and I'm a private candidate so I don't really have any teachers to help me, I was just wondering if you could please give me any tips you're allowed to give on what to expect thanks.
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Pri0103
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(Original post by eggfriedrice)
A2 coursework evaluative last chance.

I know discussion of any questions/answers is prohibited.

The title just isn't giving me much so I was wondering if the chemists of TSR could brain storm some ideas for me to revise? (:


Hiya, I've got my evaluative practical on Saturday last chance to do mine too.

Was wondering if you'd be able to help ?

Thank you
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shaz996
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I was wondering if anyone had any useful topics that should definitely be revised for this ISA? Thank you
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TheDamnTing
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Titrations, thermal decomposition and precipitation reactions.
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