The test solution, is made acidic with Nitric acid and then the silver nitrate solution.
The role of Nitric acid is the react with any carbonates to prevent the formation of the precipitate Ag2CO3, because this will mark the product (and you don't want that happening haha).
The equation:
2HNO3 + Na2CO3 --> 2NaNO3 + H2O + CO2
Fluorides: No precipitate will form.
Chlorides: White precipitate will form. Ag+(aq) + Cl- --> AgCl(s)
Bromides: Cream precipitate will form. Ag+(aq) + Br- --> AgBr(s)
Iodides: Pale yellow precipitate will form. Ag+(aq) + I- --> AgI(s)
But you ask what happens if you add it after? Idk lol but maybe the carbonate will mask the product?
Make sure you find out you got they questions wrong and if the mark scheme doesn't explain it properly, then ask here
Also, perhaps you should write down on a paper your mistakes?
Sup dina, how've you been? Yeah it's mostly those bonding Q's with like vander vaals forces and **** because I sometimes get confused by them, also the typical careless errors. I always write on my paper the answer and make a mental list of things I have to go over.
Sup dina, how've you been? Yeah it's mostly those bonding Q's with like vander vaals forces and **** because I sometimes get confused by them, also the typical careless errors. I always write on my paper the answer and make a mental list of things I have to go over.
Just came across a unit 5 question which has questioned my knowledge a bit...
So when you're working out the number of moles for a gas at r.t.p, eg. hydrogen are you working out the number of moles of H2 gas? or the number of moles for Hydrogen ( singular)
Just came across a unit 5 question which has questioned my knowledge a bit...
So when you're working out the number of moles for a gas at r.t.p, eg. hydrogen are you working out the number of moles of H2 gas? or the number of moles for Hydrogen ( singular)
Just came across a unit 5 question which has questioned my knowledge a bit...
So when you're working out the number of moles for a gas at r.t.p, eg. hydrogen are you working out the number of moles of H2 gas? or the number of moles for Hydrogen ( singular)
think it's the former but can someone confirm?
Fundamentally: Hydrogen, Nitrogen, Oxygen and the Halogens all exist as diatomic molecules so yes, It's H2 (g) Although avogadro's constant can apply to anything from atoms to molecules to tin cans. 1 mole of anything is always 6.02 x 10^23 whatever.
This has been said billions of times across TSR and a few other people have said on this thread already, you're not allowed to provide answers for EMPA or ISAs AT ALL! That would be classed as cheating which wouldn't be fair
You're not allowed to share answers at all or shared locked/unavailable papers.
You do realise that exam boards like AQA are monitoring TSR so if you get caught and are identified, there is a chance of you getting disqualified
YOU DO UNDERSTAND YOU'RE NOT ALLOWED CHEAT AND THAT COULD BE CLASSED AS CHEATING RIGHT?!!!!!!!!!!!!!!!!!!!!!!!!
Yeah I mean a B isn't too bad considering I literally thought I knew nothing about chemistry, but after revising I feel more confident apart from the bloody intermolecular bonding and stuff which is just so annoying. If I can get near full marks in the section B part of the paper which I really like it will bump up my grade
Btw you done the chem empa paper? I would really like the answers
I've just joined recently but apparently AQA and other exam boards moderate these threads so we can't talk about practicals in detail. This is a high-profile thread so they'll probably check and maybe Identify you if you've given away too much info... Other regular users on this thread may have seen them?
I'm actually pissed off now. I've said this thousands of times now...
This has been said billions of times across TSR and a few other people have said on this thread already, you're not allowed to provide answers for EMPA or ISAs AT ALL! That would be classed as cheating which wouldn't be fair
You're not allowed to share answers at all or shared locked/unavailable papers.
You do realise that exam boards like AQA are monitoring TSR so if you get caught and are identified, there is a chance of you getting disqualified
YOU DO UNDERSTAND YOU'RE NOT ALLOWED CHEAT AND THAT COULD BE CLASSED AS CHEATING RIGHT?!!!!!!!!!!!!!!!!!!!!!!!!
People in the past have been caught by the exam boards for asking questions and in the rare case have had been noted down by the exam board. Remember that AQA etc moderate here so don't risk it