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

C0balt
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#1141
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#1141
I'd bother with the mark scheme if I had the paper in hand but I don't and my memory has drastically gotten worse since last year (I could remember every question off my heart for unit 2 mark scheme! lol) so I'm not going to bother unless someone gives me a copy....I'll chill with C3 revision for tomorrow lmao
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Science&Despair
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#1142
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(Original post by chemica)
I pray to god that is the case!!
For IAL exam it was 68 last year and the response to this years is far less positive so i think 66 is a fair guess.
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Don Pedro K.
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(Original post by C0balt)
I'd bother if the mark scheme if I had the paper in hand but I don't and my memory has drastically gotten worse since last year (I could remember every question off my heart for unit 2 mark scheme! lol) so I'm not going to bother unless someone gives me a copy....I'll chill with C3 revision for tomorrow lmao
I didn't mean an official lol those aren't allowed. I meant unofficial
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sayshay
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#1144
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You know the big question on how to process the data to find the activation energy... could you say find the rate of reaction at different temperatures and plot ln(rate) on the y axis against 1/t on the x axis? Everyone's sating plot lnk against 1/t but the question said ln(rate) = -ea/RT
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Whizbox
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#1145
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I'm happy to have a go at the unofficial mark scheme if someone can help me with topics:

Multiple Choice

Acid titration stuff

Something else?

Bromine/Iodine clock kinetics

Carboxylic acid section C
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payet27
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#1146
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#1146
Unofficial mark scheme please.
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CLGC98
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#1147
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#1147
What was the hazard associated with one of the named substances? I guessed ammonium chloride is toxic
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payet27
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#1148
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#1148
(Original post by whizbox)
i'm happy to have a go at the unofficial mark scheme if someone can help me with topics:

Multiple choice

acid titration stuff

something else?

Bromine/iodine clock kinetics

carboxylic acid section c
please post the mark scheme bro
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C0balt
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#1149
(Original post by Don Pedro K.)
I didn't mean an official lol those aren't allowed. I meant unofficial
yeah i know i meant id have a go at making one but not gonna bother trying to remember the questions lol
(Original post by sayshay)
You know the big question on how to process the data to find the activation energy... could you say find the rate of reaction at different temperatures and plot ln(rate) on the y axis against 1/t on the x axis? Everyone's sating plot lnk against 1/t but the question said ln(rate) = -ea/RT
it is ln rate against 1/T I'm pretty sure
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chemica
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(Original post by Science&Despair)
For IAL exam it was 68 last year and the response to this years is far less positive so i think 66 is a fair guess.
Do you unit 4 is harder than unit 5 ? swear down last years unit 5 was piss easy
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Whizbox
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#1151
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#1151
(Original post by payet27)
please post the mark scheme bro
I'm willing to try and see what I remember, but I need help with the topics
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jess.olo
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#1152
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(Original post by sayshay)
You know the big question on how to process the data to find the activation energy... could you say find the rate of reaction at different temperatures and plot ln(rate) on the y axis against 1/t on the x axis? Everyone's sating plot lnk against 1/t but the question said ln(rate) = -ea/RT
I wrote ln(rate) as well. they did give us an equation which said that. so it would make sense to make that 'y'. I think we'll be fine
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Don Pedro K.
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(Original post by C0balt)
yeah i know i meant id have a go at making one but not gonna bother trying to remember the questions lol


it is ln rate against 1/T I'm pretty sure
People were saying you use lnk where k is the rate constant :/ I used 1/K (K being temperature in Kelvin) for x axis and ln(1/time) for y axis :/ dunno if that's right.
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RUNSran
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#1154
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#1154
Guys I used pencil for the graphs, i know this is obvious but is that going to be an issue in terms of scanning the papers ?
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Don Pedro K.
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#1155
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#1155
WAit were we meant to label the titration curve o.O?
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payet27
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#1156
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#1156
I beg someone post the unofficial mark scheme, desperate to know how i done.
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C0balt
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#1157
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(Original post by Don Pedro K.)
People were saying you use lnk where k is the rate constant :/ I used 1/K (K being temperature in Kelvin) for x axis and ln(1/time) for y axis :/ dunno if that's right.
they gave you the flippin equation
ln rate = - Ea/R x 1/T + constant
why is it there if its not what needs to be used lol
it takes the form y=mx+c where y= ln rate, x=1/T, m=-Ea/R so you only had to say plot ln rate against 1/T. where T is in Kelvin
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C0balt
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#1158
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(Original post by Don Pedro K.)
WAit were we meant to label the titration curve o.O?
only indicate equivalence points .
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dj3k
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#1159
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#1159
Has anyone made a Hitler reacts video for this exam yet?
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Don Pedro K.
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#1160
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(Original post by C0balt)
they gave you the flippin equation
ln rate = - Ea/R x 1/T + constant
why is it there if its not what needs to be used lol
it takes the form y=mx+c where y= ln rate, x=1/T, m=-Ea/R so you only had to say plot ln rate against 1/T. where T is in Kelvin
So is that a yes or no?

(Original post by C0balt)
only indicate equivalence points .
Sick
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