Chemistry synoptic edexcel!

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Reply 40

hornblower

I think I did well enough in this exam. Not bad at all.

Reply 41

infekt

scarlet ibis

yeah i thought that
i was like, where are the 6 marks in this?

at least now i have a chance of getting an overall A

Reply 42

The Albatross

yeah same. i really need an A!

Reply 43

xaxa

emporium

wow someone did question 4 hehe, congratulations you must be one of about 3 in the country :wink:

Weird isn't it: everyone at my college did 4, very few did 2. Probably, it depends on the teachers.

I got 4.something for the ozone, probably it's me that's wrong

Reply 44

crazy_cath

Nobody in my school was able to to that calculation in the first question. It seems all of you guys could do it! Is there like a set method for it that we just wern't taught? I somehow got x=3! Just wondering if anyone could show me???

Reply 45

[_Z_]

Even at my school.... most ppl did 4..... ozone answer was

H---c=c----H
_ _H/ \c2h5

quite a few did 2... said they found it easy.....

Reply 46

ravs

method for tthe first calculation:

you got AgCl as a ppt, that other huge compound had 3 Cl's in it therefore the ratio was 1:3

you find moles of AgCl

divide 3 to get moles of that huge compound

then do mass over males to get the Molar mass which was 277.5
then minus the Relative atomic mass of K and Cl and Mg and all that crap, leaving just the xh20

that equals 108 left and cos h20 is 18 you do 108 divided by 18, giving 6

Reply 47

crazy_cath

oh god so did not do that, but I get how you got there!
DAMN!!!!!!! How FRUSTRATING???

Reply 48

Hoofbeat

ravs

method for tthe first calculation:

you got AgCl as a ppt, that other huge compound had 3 Cl's in it therefore the ratio was 1:3

you find moles of AgCl

divide 3 to get moles of that huge compound

then do mass over moles to get the Molar mass which was 277.5
then minus the Relative atomic mass of K and Cl and Mg and all that crap, leaving just the xh20

that equals 108 left and cos h20 is 18 you do 108 divided by 18, giving 6

Thanks for showing the method. It makes sense. I'd never seen one of those questions before and stupidly got x=0.12!!! So I will have lost loads of marks (got the no of moles of AgCl so hopefully one mark!), but think I did ok on the rest of the stuff. I did Q2,3 as did most ppl at my school. I tried Q4 as had time left, and they do give you the 2highest marks from the 3questions, but I gave up as didnt like it!

Oh well, can't change the past now, and I'm still feeling quite confident, so hopefully I will have got my A. If not, then I can still get my A in biology and hopefully meet my Uni offer! Just glad it's all over...