If you do and understand past papers, all homeworks etc. that's all you need to do, if not multiple times. have a spreadsheet of all the past papers, worksheets and homeworks I did and the scores achieved. This provides a way to quickly analyze weak spots and spend more time on a particular topic.
This is true. Although for anyone who is studying for future/sister specifications and a good exercise I'd suggest is to generate your own notes, using these and other sources to create your own personal spin on it.
For those that were asking F325 revision notes have now been compiled and added to the thread, I've also added a useful links section I plan to update with the website resources I use (and perhaps If I find). I'm also considering adding my past paper spreadsheet as a template if there's any interest.
For those that were asking F325 revision notes have now been compiled and added to the thread, I've also added a useful links section I plan to update with the website resources I use (and perhaps If I find). I'm also considering adding my past paper spreadsheet as a template if there's any interest.
Hi Can u help me with this question, I calculated in the previous question that the pH was 11.7 And then after further treatment, the new sample had 100 times greater OH- than the H+ What is the pH of the new sample, its only 1 mark so I guess theres no calculation
Thread is in progress. Comment if a link is broken and I'll fix it asap.
Hello I am ForgottenApple, I recently finish A Levels with some reasonable results (A*A*A* Maths, Physics & Chemistry). This thread is to help you achieve something similar at the same level. I created these resources for myself last year and have brought them up into a good enough order to help other people out. This thread is a chemistry counterpart to a new thread I've made this year for Chemistry and incorperates all but the practical element of the OCR Chemistry A Level course (to be revised in 2015) but nonetheless there is a full year of students who can benefit from these resources and any students who opt to resit thereafter.
Most notes I wrote last year, as well as the standard answers being made by me (idea from my college), definitions lists, legacy resources/past papers/bonus questions tend to be lifted :P
Link to physics thread Unlike the physics thread I'm going to sort of build this as I go so it may not be complete for a month-ish
Hi Can u help me with this question, I calculated in the previous question that the pH was 11.7 And then after further treatment, the new sample had 100 times greater OH- than the H+ What is the pH of the new sample, its only 1 mark so I guess theres no calculation
Hey Rabokor basically what ya gotta do is shove what ya been told into the formula.
Kw= [OH-][H+] Kw = 1x10^-14 at 25 degreesals
We've been told that [OH-] = 100[H+] so we substitute this back in (least I would). Kw = 100 x [H+] x [H+] = 100[H+]^2
Now you can rearrange and solve for H+ which gives you the pH
I got 8 when I did it, so check with the ms to make sure I'm talking some sense!
Really struggling to understand Entropy It's only 2 pages of the book and seems strightforward but when I tried past paper questions, I just couldn't understand
Hi Can someone help with this question please . 3(a) i . To get the moles of H2 do I times 3/2 and the equilibrium mixture of CH4 or times 3 by the moles c2h2 . How would I know which one to use ?