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OCR Chemistry B (Salters) F334/F335 Exam Thread 2016 (14th/22nd June)

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Original post by lyricalvibe
You'll be the go-to person to verify answers come Tuesday :wink:

I've still got 2014 and 15 for COM and haven't started f335 papers yet :/


Oh no, I'm terrible at chemistry lol
Potential 5/6 markers:
TLC
Colorimetry Method
Manganate Titration
DNA damage and effect on enzymes
Re-Crystallization technique (choice of solvent etc)

There are a couple more that have come up but couldn't remember them all
:smile:
Original post by kosvengali
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How is everyone balancing both f334 and f335 revision?


I haven't even started f335...what's f335? 😪🙈
Original post by Daniel9998
What are you guys getting in past papers?
Im getting anything between 65-70 marks which usually ends up being As (somehow?) but for some reason I still dont feel confident for this exam one bit....

Chemistry ****s with my head




Im really Unconfident too :frown:
Reply 104
Original post by Marli-Ruth
Really? :O


Yeah very vague!! Don't learn them! Go by your book they are wrong you won't get some marks
If you have the time, try some legacy papers they help out a lot.
Reply 106
Original post by SohaXO
add me too please!

Yu gotta pm me ur numbers guys
Original post by music2402
Buffer solutions resist change in pH when a small amount of acid or alkali is added. This is because the buffer solution forms an equilibrium reaction.

Buffer solutions are a solution of weak acid or alkali and its constituent salt.

When acid is added, equilibrium position shifts to reduce the H+ concentration so to stop the pH decreasing (because more H+ means a smaller pH).

When alkali is added, the system tries to counteract the change by increasing the concentration of H+ so to stop the pH increasing.

I hope this isn't too jumbled :smile:


Thank youuu :smile:
(edited 7 years ago)
Original post by SohaXO
Yeah very vague!! Don't learn them! Go by your book they are wrong you won't get some marks


the answers are taken from the mark scheme I think
Reply 110
Original post by sam2222
the answers are taken from the mark scheme I think


Trust me, those are not mark scheme answers

They are missing key words and points
Original post by SohaXO
Trust me, those are not mark scheme answers

They are missing key words and points


oh ok what grades you guys need? I need at least a B
Reply 112
Original post by sam2222
oh ok what grades you guys need? I need at least a B


hopefully an A
Reply 113
Original post by kosvengali
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How is everyone balancing both f334 and f335 revision?


doing at least 1 f335 paper a day
I need a low B. Hopefullt I get it considering I'm doing last min revision for F334
guys for f335 ph ka ect.. and oxidation state... watch this guy!!!!!! he is the best teacher I have ever watched!
https://www.youtube.com/watch?v=-ctr9MUM_hI&list=PL81D400586C044127&index=88
Hi guys any definitive rules on appropriate amount of significant figures?

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Original post by KINGYusuf
I need a low B. Hopefullt I get it considering I'm doing last min revision for F334


you fasting?

just to let you know your not alone... I'm doing last min revision too but we can do it!!!!
Can anyone explain the difference with TLC when its with amino acids?
Original post by RyanOsman
Can anyone explain the difference with TLC when its with amino acids?


You use ninhydrin as your locating agent

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