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OCR Salters Chemistry F335 12th June 2013 Exam revision thread

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Original post by stealth_writer

i put time instead of retention time. Is the word retention essential?

yeah it is because it has to specifically be the amount of time spent in the column, sorry :frown:

:frown:

What did people get for the % increase Q?

Original post by Sam1357

What did people get for the buffer solution calculations. Did u have to use [h+]= ka x acid/salt but we didnt have the concs of The salt given and even the acid conc was well back on the previous page.

what about the question where it said "NaOH was added so that it reacted with half of the m/ethanoic acid(can't remember) what is the change in pH now

Was literally just about to ask this! Can't really remember the question, but think I got pH 3.something for first part, and 4.something for the second part?

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Original post by billybobs

700 and something, 793 I think?

i got a number like that... complete guess though!

Did anyone divide Ka by three for the neutralisation of half the acid question?

Any else get 180 as iodine number of very last question?

how many marks was all the mass spec worthy including the give the formula bit, i got it all wrong thought it was the highest peak, so maybe i miss ready the question

Original post by Reina

Did anyone divide Ka by three for the neutralisation of half the acid question?

i did that! there was a similar q on the january 2013 paper

Original post by stealth_writer

What did people get for the % increase Q?

101. something %???

what did people put for the 'industrial use of hydrogen'? (i think that was the question!)

20 something %

Original post by stealth_writer

What did people get for the % increase Q?

Original post by manpyy

yeah it is because it has to specifically be the amount of time spent in the column, sorry :frown:

:frown:

I put the "the time taken" . so not right then?

Original post by HTB

what did people put for the 'industrial use of hydrogen'? (i think that was the question!)

I blabbered and said 'use it in hydrogen fuel cells for vehicles' haha

Original post by HTB

what did people put for the 'industrial use of hydrogen'? (i think that was the question!)

i put to use as a fuel, took a random guess

Futuristicmedic

Original post by HTB

what did people put for the 'industrial use of hydrogen'? (i think that was the question!)

Harber process

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Original post by abzy1234

3 marks it was worth right... Then it has to be 3 arrows unless there was something else?

That whole question was quite weird tbh lol :tongue:

:tongue:

which question was this?! I remember drawing one curly arrow but not THREE?! :'(

Original post by HTB

what did people put for the 'industrial use of hydrogen'? (i think that was the question!)

Hydrogenation of alkenes to alkanes . So unsaturated fats to saturated fats . Like spreadable butter

Futuristicmedic

For the half acid one I divided by 2 ?

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Original post by stealth_writer

What did people get for the % increase Q?

I got 23something%

Original post by Reina

Did anyone divide Ka by three for the neutralisation of half the acid question?

Yeah that's right I think.

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