I teach A-level Chemistry (AQA specification) and A-level Biology (OCR A specification), as well as GCSE Biology, Chemistry and Physics (8461-8464). Use these videos to help you consolidate your understanding and get the best possible grade in your exams.
By using Kw, the ionic product of water. Kw = [H+][OH-] so by rearranging you can solve for [H+] and then plug it into the pH equation. (If you're working at 298K you can also cheat and use 14 - pOH, but that only works at one specific temperature!)
You get an answer in mol/dm3 instead of g/dm3. That's way more useful for chemistry when you need to know how many molecules are reacting, which you can't do with masses.
No because the potassium permanganate is in the burette, not the comical flask. If it gets reduced it goes colourless. If the reaction is over it will stay purple, and change the colour of the conical flask
This video really helped me and will in my mocks coming up thank u. It takes ages to go through alot of the chemistry topics and going through them quick and easy to understand is great 👍
Potassium is 39.1 Fluorine is 19. It's 58.1 That's the number I've used at 8 minutes ish and 10:20 ish. Is there another place in the video featuring KF?
Have I put in a question somewhere where I've said it is? (Entirely likely...) or do you just mean in general? If the latter, then usually by sulfuric acid reacting with other compounds like copper oxide or copper carbonate.
Hi, if I learn EVEYRTHING in the GCSE QUANTITAVE CHEMISTRY playlist (that you made), will I be set for all questions from this topic? This is because I find it very hard to 'work it out', unless I know how to do it. BTW, I am predicted a 9 in GCSE CHEMISTRY (and in all the three sciences and maths), but it gets really confusing if you don't know what to do!
Nobody is going to intentionally not mark your work. The issue is that blue pen (especially light blue pen) doesn't scan so well so it makes it harder to make out what you've said (rather like having bad handwriting). If it's a decent navy biro, you'll still be fine
ennit man exact same thing.. i might have to take Gap year and resit cuz paper 2 went really bad but hopefully I can bring it back tommorow. Biology went decent for me but its just Chem
could i reduce ketone back to a secondary alcohol and then do the acidified potassium dichromate test and since tertiary doesnt reduce it will be identified
Hi, how would i know whether to write this practical or practical 7A when asked the question as this question looks similar to practical 7A question as they both ask for order, so how would i know whether to describe continuous monitoring experiment or order via initial rate experiment when asked a similar question. please get back to me, Thank you very much.
If you got a gas In the reaction, your gonna use a gas syringe so it’s continous monitoring method, a lot of times in the question it will tell you whether it’s initial or continous if not look at whether there’s a gas in the equation
@@mohammedseedat8637 am i right in saying we can calc rate via intial method for continous monitoring too? as in calc the gradient at t=0 for each conc?
I've never seen it in a mark scheme, probably because realistically you put your CF and pipettes through the dishwasher so they're fine but it's the burette that get poorly rinsed by hand that give you trouble
