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Edexcel Core 3 - 21st June 2016 AM

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Reply 1840

Maxoman

Original post by veronica1297

Durham is my top choice! I need A*AA for Industrial Chemistry so I'm praying all the rest of my exams go decently

how did you do in core 3?

Reply 1841

immagooner

anyone reckon the grade boundaries would be reli similar to last year's coz the length is almost the same and i think tdy's paper's slightly harder than last year's...

Reply 1842

Azzer11

Original post by TheMathsMan

*** ... For the Rcos question I put -26.57 for alpha for some odd reason .. maybe be I though -sinx and thought -1 or some **** .. idk I was half asleep ... how many marks would I lose as it effects the entire question.

Unlucky man, I did the exact same thing and worked out a negative alpha and then I asked myself 'wtf am I doing?'.

Reply 1843

veronica1297

Original post by Maxoman

how did you do in core 3?

I think I did alright, definitely not as well as I had hoped. Probably a low A.

Reply 1844

mchocchip

Original post by veronica1297

Does Arsey still post an unofficial mark scheme?

no, he's been asked by edexcel not to

Reply 1845

Owensmith16

Original post by JoshuaKader97

I think that it definitely pulled out more stops than last year, like that arcsin(x) graph never comes up and with exponential's that dosage has only ever come up once I think. So in that sense it was a bit more obscure than last year and I should expect the grade boundaries to be even lower, if not then the same.

Don't worry about the A*, you can still definitely get it by getting a really good mark in C4. Make sure that you've done most Gold papers and only do C4 past papers that are post 2011 as those are much more representative to what you're going to get this year.

Good luck!!

You need 90UMS in core 3...

Reply 1846

Pablo Picasso

Original post by TheMathsMan

Anyone willing to help a brother out ? ..." *** ... For the Rcos question I put -26.57 for alpha for some odd reason .. maybe be I though -sinx and thought -1 or some **** .. idk I was half asleep ... how many marks would I lose as it effects the entire question."

For
a) lose 1
b) lose 2
c) lose 2 (assuming that both of the marks are for accuracy)

Reply 1847

Swifty139

Can't remember the values I got from solving the trig equation but I got cot^2(x) - 3cot(x) - 1 = 0 so tanx = 2/(3+/-root13) does this ring a bell for anyone?

Reply 1848

TheMathsMan

Original post by Pablo Picasso

For
a) lose 1
b) lose 2
c) lose 2 (assuming that both of the marks are for accuracy)

thanks for answering mate .. made me feel a tad bit better :P Wasn't a bad paper tbh .. my only problems was the stupid alpha mistake and a bit of the last question. How did you find it ?

Reply 1849

Mattematics

Original post by Owensmith16

You need 90UMS in core 3...

You need 180 total from C3 and C4, not necessarily 90 in both.

Reply 1850

1017bsquad

Original post by Swifty139

Can't remember the values I got from solving the trig equation but I got cot^2(x) - 3cot(x) - 1 = 0 so tanx = 2/(3+/-root13) does this ring a bell for anyone?

yeah got the same thing

Reply 1851

TheMathsMan

I counted 60/75 for myself because of my stupid mistakes .... :/ Still on track for my a grade though ;-p I think ...

Reply 1852

Angus09

Original post by Azzer11

Unlucky man, I did the exact same thing and worked out a negative alpha and then I asked myself 'wtf am I doing?'.

What was alpha then ?

Reply 1853

Whizbox

How many marks will I have lost for only finding the wrong value for the tan4x turning point question?

Think that's the only marks I've dropped on this paper, was hoping for full UMS

Reply 1854

Maxoman

Original post by Pablo Picasso

Gonna have to do another year then.

you seem like a dick

Reply 1855

Azzer11

Original post by Angus09

What was alpha then ?

26.57 I believe.

Reply 1856

the___jackal

did the normal equation question specify in the form y= ?

Reply 1857

Pablo Picasso

Original post by the___jackal

did the normal equation question specify in the form y= ?

Not at all, so

y-16 = -1/2(x-3) suffice

Reply 1858

patrick21_1

Original post by the___jackal

did the normal equation question specify in the form y= ?

I believe it said "find an equation" so no specific form

Reply 1859

Angus09

Original post by Azzer11

Can anyone explain why the hell I got the last answer right but in its negatve form i.e. -5ln(...) instead of 5ln(...). Probably just some stupid sign error, 2 marks lost approx?

i got -5 aswell and then when people were saying they got 5 i wasnt sure where i went wrong but now ive realized. i dont know if you did the same working as me but i multiplied everything by e^0.2T and wrote down 0.5e^-0.2T insteadof 0.5e^0.2 T on the RHS. so when i divided by -0.2T instead of 0.2