GCSE C3 AQA - I can answer any questions you have

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I understand the whole of C3 and i have tonnes of workbooks and textbooks so i can answer any questions you may have for the exam :)

Posted: 24-05-11 16:23 by Lauren Jade Tutchener

What if I asked you the meaning of my existence....What would you say?


Posted: 24-05-11 17:23 by Mary

its not on the syllabus :)

Posted: 24-05-11 17:55 by Lauren Jade Tutchener

Lauren Jade Tutchener wrote:

its not on the syllabus :)

Hahaha! lol :)

In C3 when you have to work out the empirical formulae using the mass of the material. ehy do you have to times one of them by two? :) x

Posted: 24-05-11 18:51 by Edward Pinches

Can you explain all the required tests with results?

Posted: 24-05-11 19:57 by Bertie Rowbotham

Flame Test (cations)
-steralise wire loop

- add compound

- put into a roaring firs

-identify colour

Bright red = lithuim

golden yellow = sodium

lilac = potassium

brick red = calcium

green = barium


double bonds turn bromine water colourless when heated (unsaturated)

single bonds turn bromine water orange/brown when heated (saturated)


add sodium hydroxide

calcium, aluminium and magnesium = white precipitate (aluminium redissolves when excess is added)

Copper (II) = blue precipitate

Iron (II) = green precipitate


add dilute nitric acid then silver nitrate
chlorine = white precipitate

bromide = cream precipitate

iodide = yellow precipitate

if nothing happens star another test with the chemical add dilute HCL and barium chloride
sulfate = white precipitate


mix with aluminium powder then add sodium hydroxide and heat

if ammonia is made the compound was nitrate
ammonia is tested usiing red litmus paper

Posted: 24-05-11 22:38 by Lauren Jade Tutchener

The ones needed for the exam today was

NITRATE and SULPHATES, Im pretty sure I got them, what did you guys get ?

Posted: 25-05-11 19:40 by Frenchie

Nitrate - add NaOH + a little Al powder = white precipitate

Sulphate- add NaOH + BaCl = white precipitate

For the titration did you get 0.128 (something along those lines), although I assumed it was a 1-1 reaction so I put 0.064

Finally did everybody get CH2 ?!

Posted: 25-05-11 20:26 by Miranda

yup i put 0.128 because i doubled (nh3)2, or whatever it was , to get a 1:2 !! Titration was altogether 5 marks??

empirical formula CH2 worth 3 marks :D

Posted: 26-05-11 22:45 by Frenchie

can you tell me the c2 and b2 2011 markscheme or unofficial markscheme

Posted: 28-05-11 13:20 by Jatinder