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OCR Salters Chemistry 2849 - Chemistry Of Materials

jabberite

Anyone got any past exam papers for 2849 chemistry of materials

Urgent please!!

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Reply 1

W0nker

How did everyone find it?

Reply 2

WelshMe

Hmmm not too bad. It was a resit and whilst i think i did better this time, i still know i made silly mistakes, for exampe identifying the ion for molecular peak 15, i put CH3, when its CH3+. Bah, oh well.

Reply 3

hitman012

That wasn't too bad, although I didn't like the first question that much. I stupidly put 3d⁵4s¹ for the electron configuration though :frown:

Reply 4

anotherarunan

How do you think it went? I thought the last question was well tricky! Completely messed it up!

Reply 5

Swinely

lol i got a max of 50%, not bad considering i didn't do any revision or go to any lessons in ages.

Reply 6

jabberite

thought it went OK, couple of trickies couple of easies, nothing horrific! :smile:

Reply 7

W0nker

I thought it went pretty well.

What was the oxidation state of nickel? 4+?

Reply 8

W0nker

WelshMe

Noooo ffs lol i put that too. Surely they're not that harsh?!

Reply 9

anotherarunan

yeah +4 coz the O2 was -4

Reply 10

WelshMe

Well it was a two marker, so we'll get one mark!
I dont mind if i dont get marks because i genuinely dont know the answer, but when i lose marks because of stupid mistakes, it annoys me. Especially when im right on the border between an A and B and every little helps!

Reply 11

W0nker

Yeah true i was wondering why it was 2 marks.

Reply 12

divvyshivvy333

i thought it was horrible!!

why were there so many questions on drawing out repeating units??

and my brain just blanked when it came to recrystallisation so ive lost 4 marks there coz i attempted to make it up.

and that last question about copper was horrid!!

ergh! so disappointed :frown:

Reply 13

username68316

very easy exam i thought. This time i didn't leave any huge questions out for once!

The half life graph was order 2 i believe since the half life was not constant. anyone else?

Also, i didn't see recrystallistion on the syllabus, but saw it in a past mark scheme yesterday! which was lucky.

Reply 14

divvyshivvy333

hmm....ok so i have 1 mark. yay!!

yup. that was horrible and hard and i wouldnt be surprised if i flopped that majorly :frown:

Reply 15

Negin

what did you get for the mass of the paracetamol left after 4h's?

Reply 16

W0nker

I got 0.6, which is too big but it's wrong .. because I had to extrapolate, 4 hours is 14400 seconds, graph only went up to 14000..

But after 4 hours, 4 half-lives have passed which means the fraction left will be 1/16 so if you mulitply that by 1g it's 0.06 or something, that might have been the way to do it. But did it say use the graph