OCR A2 CHEMISTRY F324 and F325- 14th and 22nd June 2016- OFFICIAL THREAD

You see, this is my problem, it IS their fault, if you don't know the specification like the back of your hand, and then some, you HAVE NOT done enough revision, none of the calculations were complicated, nothing was off-spec, none of the questions were worded badly, this wasn't some wet and oily lap in the reasonably priced car, this was perfect conditions, it was the choice of every student whether they wanted to drive the reliant robin (not revise) or a McLaren 675LT (revise).

My daughter felt this was a good paper, she was well prepared and came out feeling happy, However she was kind enough to empathise with her fellow class mates, some of whom have difficult situations. Perhaps it is better to remain silent if you are unable to be supportive. Isn't that what this site is also about!

Reply 3901

k.russell

13

4Au + 8CN- + O2 + 2H20 = 4[Au(CN)2]- + 4OH-
Found it @alu4days this is what I had as well I'm pretty sure
Also for the catalyst I think there are several valid points, such as;
1) It is in the overall reaction equation
2) Not regenerated
3) Has no impact on rate of reaction
I went for the third option, have a nasty feeling you may need more than 1 answer for the mark

Reply 3902

username1625799

15

Original post by BioStudentx

It was neutral until the people who found it hard started attacking everyone else. Not cool to take your anger out on others.

It wasn't neutral it was alkaline [OH-]>[H+]

Reply 3903

lolo11

1

Original post by leobrave

It wasn't neutral it was alkaline [OH-]>[H+]

legit what I was thinking :tongue:

Reply 3904

lai812matthew

10

Original post by Hixy

My daughter felt this was a good paper, she was well prepared and came out feeling happy, However she was kind enough to empathise with her fellow class mates, some of whom have difficult situations. Perhaps it is better to remain silent if you are unable to be supportive. Isn't that what this site is also about!

yeah this is what this site should be about..... , you don't know hardcore TSR people much i guess. don't take it too serious for comments in internet lol.

Reply 3905

BioStudentx

16

Original post by leobrave

It wasn't neutral it was alkaline [OH-]>[H+]

I was referring to the arguments occurring in the forum.

But yes it was alkaline and I still don't understand why.

Reply 3906

BioStudentx

16

Original post by A Slice of Pi

It seems as though you've done so much 'revision' that your social skills are suffering. In what way are those posts helpful or constructive to people on here looking for answers/support? They serve absolutely no purpose other than to massage one's ego. I mean are you seriously that arrogant? Shocking... :facepalm:

What's more shocking is that people like you are still falling for these trolls... After every exam (regardless of difficulty or exam board) they do the same thing in each forum...

It's great banter though.

Reply 3907

lolo11

1

Original post by BioStudentx

I was referring to the arguments occurring in the forum.

But yes it was alkaline and I still don't understand why.

Kw = [OH-][H+]

Kw and ph given. Rearrange formula to obtain [OH-]. Compared with [H+] (worked out by 10^-ph), [OH] > [H+], thereby making the solution alkaline...

Reply 3908

BioStudentx

16

Original post by lolo11

Kw = [OH-][H+]

Kw and ph given. Rearrange formula to obtain [OH-]. Compared with [H+] (worked out by 10^-ph), [OH] > [H+], thereby making the solution alkaline...

Oh ****. I did exactly that except I said Kw/10^-7 is H+ and not OH-. Oh dear haha.

Reply 3909

lolo11

1

Original post by BioStudentx

Oh ****. I did exactly that except I said Kw/10^-7 is H+ and not OH-. Oh dear haha.

Easy mistake. Don't worry- think it was just like 1 or 2 marks. Everyone is going to make silly mistakes somewhere XD

Reply 3910

Slenderman

2

In comparion to 2015. Harder or easier? Am I retarded to think the grade boundaries will be 75 for an A?

Reply 3911

k.russell

13

Original post by BioStudentx

Oh ****. I did exactly that except I said Kw/10^-7 is H+ and not OH-. Oh dear haha.

wanna know a worse mistake? I worked out [OH-] and [H+] then decided that 9.4x10^-7 was a smaller number than 10^-7......

Reply 3912

MrZebraCookie

2

Original post by k.russell

you're right, CuI is insoluble in water dw
I was doing it right at the end cos I was doing the ionic equation for the question above (which asked for some other full equation) and realised my mistake with about 10 seconds left lol

What question is this?

Reply 3913

username2640523

8

Original post by Slenderman

In comparion to 2015. Harder or easier? Am I retarded to think the grade boundaries will be 75 for an A?

slightly harder, 85-A*, 77-A just what I think

Posted from TSR Mobile

Reply 3914

MilkFriend

Got 10.76 instead of 10.68 for one of the ph calculation... not sure where I went wrong tho...

Reply 3915

lai812matthew

10

Original post by MrZebraCookie

What question is this?

excess KI + copper (II) ions --> solid copper(I) iodide + iodide ion i think.
the same experiment come up a couple years ago i think.

Reply 3916

username1625799

15

Original post by BioStudentx

I was referring to the arguments occurring in the forum.

But yes it was alkaline and I still don't understand why.

Yeah I know sorry, I was just trolling :frown:

Reply 3917

MrZebraCookie

2

Original post by lai812matthew

excess KI + copper (II) ions --> solid copper(I) iodide + iodide ion i think.
the same experiment come up a couple years ago i think.

I don't even remember this being asked. Do you know where it was in the paper?

Reply 3918

BioStudentx

16

Original post by lolo11

Easy mistake. Don't worry- think it was just like 1 or 2 marks. Everyone is going to make silly mistakes somewhere XD

Original post by k.russell

wanna know a worse mistake? I worked out [OH-] and [H+] then decided that 9.4x10^-7 was a smaller number than 10^-7......

Haha, upon reflection I lost 4 marks to stupid mistakes (and 2 marks I didn't genuinely know).

Oh dear, this paper got a bit harder all of a sudden :laugh: