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Edexcel A2 Chemistry Exams -6CH04 (14th June) and 6CH05 (22nd June) Discussion Thread

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Reply 1360

CLGC98

What order was the reaction based on the graph drawn:???? i got a straight diagonal line

Reply 1361

Chemstar_456

Long answer questions

Acid-base:
Ka1 and Ka2
work out the concentration at equlibrium
work out pH
write any assumptions you made
Draw titration curve
How to work out pKa from graph

Entropy:
Any hazards of the reaction
Entropy of the system
Why is it what you expected
Entropy of surroundings
Total entropy
How would a change in temperature affect entropy
Work out value of K from RlnK for Ba(OH)2
Compare to solubility of Ca(OH)2

Bromine clock reaction:
Why phenol needs to be in small amounts
Why others should be in excess:
Include table value for rate:
Plot graph
Order wrt Bromine ions and why
Rate equation and units
Iodine clock reaction colour change:
Measurement to be made to work out Ea:
How to work out Ea (6 marker):

Products of reaction between salicylic acid and NaOH
Difference between alkaline and acidic hydrolysis
salicylic acid and reagent to make acyl chloride:
salicylic acid and reagent to make alcohol:
Draw formula of product of salicylic acid + ethanol
Difference between reaction of salicylic acid with ethanol and product D
Draw NMR of ethanol and reasoning behind it
Why does TMS produce sharp peak
What sort of wave causes NMR
Differences between salicylic acid and acyl chloride using infrared radiation:

I think this was all the questions please add if you remember any more

Reply 1362

Don Pedro K.

Original post by Cpj16

yes

Are you gonna be doing the bio revsion session today, its at 11.30?

Nah just gonna look at some redox stuff and then go sleep. Tomorrow is my full day of F214 focused revision :smile:

Reply 1363

Miracle1

What was the value for entropy of system?

Reply 1364

Chemstar_456

Original post by C0balt

pH I got as 4.03 or 4.02 around that

My answer refers to the multiple choice question for buffer solution. 4.03 was the pH of H2S

Reply 1365

Chemstar_456

Original post by Miracle1

What was the value for entropy of system?

i got +971

Reply 1366

DesignPredator

Original post by medi098

what did people put for the question where it asks how you would know that the h2so4 used to precipitate out the acid was in excess? :ashamed2:

Add more H2SO4 and no more ppt will form.

Reply 1367

DesignPredator

Original post by Chemstar_456

i got +971

For system I believe I got around five hundred and something. I remember the total bring +47ish.

Reply 1368

Ssttll

@chemstar_456 was the second to last question :What sort of wave causes NMR. or was it: what kind of radiation is involved in NMR? I am positive it is the latter but you said it was the other, not sure though?

Reply 1369

Hamzy45

Original post by DesignPredator

For system I believe I got around five hundred and something. I remember the total bring +47ish.

Yep got something around that value. what did everyone get for the multiple choice for the pH of the buffer was it 6.21? :biggrin:

Reply 1370

DesignPredator

Original post by Hamzy45

Yep got something around that value. what did everyone get for the multiple choice for the pH of the buffer was it 6.21? :biggrin:

Yep same 🙂

Reply 1371

Hdb

Anybody remember the total entropy value?

Reply 1372

Hamzy45

Original post by DesignPredator

Yep same 🙂

Thats good to hear, for the 2 mechanism questions what did you get for the answers in the MC?

Reply 1373

C0balt

Original post by Chemstar_456

My answer refers to the multiple choice question for buffer solution. 4.03 was the pH of H2S

Lol my brain is all mixed up now, I can't remember that MCQ value! But it was just plugging the numbers into the given equation right? In which case it couldn't have gone wrong... Hopefully lol Was it C? My brain vaguely remembers ticking a third one...

Original post by Ssttll

Well only radiation involved is radio wave anyway it doesn't matter what the wording was

(edited 7 years ago)

Reply 1374

lfcrules

What did youbguys put for the measurement required (that one marker before the six marker on ea?)

Reply 1375

C0balt

Original post by lfcrules

What did youbguys put for the measurement required (that one marker before the six marker on ea?)

Rate and temperature

Reply 1376

DonPedrodoc

Original post by C0balt

Rate and temperature

Wouldn't the measurement be the time taken for the colour change to occur, then one of the calculations is 1/time to find the rate.

Reply 1377

thedylanman

Original post by thedylanman

error/value*100

e.g if a temperature is measure at 25 degrees and the error is +-0.5 degrees, 0.5/25*100

Sorry my bad. if the error in a thermometer is +-0.5 degrees, the total error is 1 degree so percentage error is 1/25 *100

Reply 1378

payet27

Original post by thedylanman

Sorry my bad. if the error in a thermometer is +-0.5 degrees, the total error is 1 degree so percentage error is 1/25 *100

when does the unofficial mark scheme come out??

Reply 1379

jaylo123

what do people think marks will be awarded for on the activation energy 6 marker?
i think
1 mark - record measurements in a table
1 mark- plot a graph of ln (k) or ln (rate) against 1/t
1 mark - negative gradient & straight line ( correlation between the two)
1 mark - gradient x R = -Ea
not sure on the rest....

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Edexcel A2 Chemistry Exams -6CH04 (14th June) and 6CH05 (22nd June) Discussion Thread

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