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Original post by ellaKrives
I put impure copper anode on the right ? is that wrong


Yes, the impure copper anode was on the left :P
Oh.. I am starting to panic now- was the first/left bigger ore pure copper cathode and the right thinner ore impure copper anode? Thank you..
Original post by heryeol
thank god, i was panicking so much in the exam! lets hope theyre right!!
but for the percentage yield, i remember getting 46?


Yes, that was it!


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Original post by Pikki1234
I got 45.8 or something for the atom economy and 46 for percentage yield


Yes, that was what I got! :smile:


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Original post by Pikki1234
I got 45.8 or something for the atom economy and 46 for percentage yield


Yes that it correct, and you must have put 46% exactly for the percentage yield since it asked for the answer to 2 significant figures :P The atom economy question however is flexible, you could have put 45.8% or 46% and still get the mark :smile:
Original post by jontypickles
Yes that it correct, and you must have put 46% exactly for the percentage yield since it asked for the answer to 2 significant figures :P The atom economy question however is flexible, you could have put 45.8% or 46% and still get the mark :smile:

Was it two significant figures, didn't see that
Original post by Pikki1234
Was it two significant figures, didn't see that


Yes it was, so 46% was the only correct answer :smile:
What were the grade boundaries last year?
Original post by TheStrikingOne
Oh.. I am starting to panic now- was the first/left bigger ore pure copper cathode and the right thinner ore impure copper anode? Thank you..


No that is incorrect, the thicker one of the left which was ​Positive was the Impure Copper Anode and the thinner one on the right which was Negative was the Pure Copper Cathode.
Reply 89
Original post by TheStrikingOne
Oh.. I am starting to panic now- was the first/left bigger ore pure copper cathode and the right thinner ore impure copper anode? Thank you..

I am honestly really confused right now
Reply 90
Original post by jontypickles
No that is incorrect, the thicker one of the left which was ​Positive was the Impure Copper Anode and the thinner one on the right which was Negative was the Pure Copper Cathode.

I would have said that, but the copper was impure on the cathode according to the diagram
Wasn't it 3 s.f
Or was that for the atom economy
Original post by shabz(1997)
Wasn't it 3 s.f


which question?
Original post by Pikki1234
What were the grade boundaries last year?


55 for an A*, 45 for an A, 35 for a B, 25 for a C, 15 for a D and 10 for an E.

I think it will be higher this year, considering our paper was slightly easier:

58 for an A*; 49 for an A; 39 for a B; 30 for a C; 19 for a D and 12 for an E


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Reply 95
Original post by shabz(1997)
Or was that for the atom economy

The atom economy percentage was flexible, the percentage yield asked to 2 s.f
Didn't the percentage yield come out at exactly 46%??? Starting to panic now because cant remember wtf i put.
Reply 97
Original post by shabz(1997)
Didn't the percentage yield come out at exactly 46%??? Starting to panic now because cant remember wtf i put.

Now i'm confused :wink: I'm sure you did the right thing in the exam!
Strangely i can't wait for results day to see what i got lol.
Original post by Juliasc
I would have said that, but the copper was impure on the cathode according to the diagram


That is incorrect, the copper is always Pure on the Cathode ​:P