ocr a f325 revision thread

i got 0.039 as the rate? is that wrong? and what was the units?

No it asked for the hydrated salt

This is what I got actually, I remember the two half equations I made for it

We can't tell yet, sorry.

what did the majority write? what about you how did you find it?

That's about right, the answer is a range. The units are of course mol dm^-3 s^-1 as ever.

I didn't have trouble with the paper, but I do think it was harder than usual.

I wrote the element in.

for the acids one, what did people say for why they had different ph's?

For the isomers of F and G did the isomers have 3 of the bidentate ligands and they were optical isomers?

Thought the paper was tough in general. Grade boundaries should be lowish but doubt they'll be as low as Jan 13 (70 for an A)

I actually got the last question although I basically guessed parts of it!

Messed up the photosynthesis question, the rates question, the changes of concentration (tick box) question, the ferrous ion question. Hoping I've done enough for the A* however.

I said it would stay the same. The whole point of the half life of a first order reactant is that it is constant regardless of concentration.

nope it was oxygen I think

No, delta H is the energy required for the reaction, not G.

I got 0.00414 recon thats correct?

do you think it was harder than jan 2013?

About 90




Why did your quote say that was me? I'm confused.

One was a strong acid, one was weak.




Yes, 3 bidentate ligands, forming mirror images.

Yes, 3 bidentate ligands, forming mirror images.

That's about what I got - I think it's right




Personally, yes, I didn't find jan 2013 that hard

for the acids one, what did people say for why they had different ph's?

No, delta H is the energy required for the reaction, not G.