Aqa a2 chem5 19th june 2012

Write down the rainbow song


This was posted from The Student Room's iPhone/iPad App

It becomes [Fe(H2O)3(OH)3] which you should know the colour of (the Fe2+ oxidises to Fe3+)

"An excess of dilute ammonia solution is added to an aqueous solution containing
iron(II) ions in a test tube that is then left to stand for some time.
State and explain what you would observe."

Mark Scheme says: Allow Fe(OH)2 oxidised to Fe(OH)3 by air / O2

Wait wut? I get the colours its just the Hydroxide thing threw me off

Wrong :P
Their definition for enthalpy of solution in the NT textbook was in the 'do not accept' column of June 11 :P

This was posted from The Student Room's Android App on my HTC Desire HD A9191

What??! They should! It's in my BOOKS - plural. Both CGP and Collins. Surely they BOTH can't be wrong.

Richard Of York Gave Blood In Vein

When drawing the shapes how do you know whether to draw an arrow or a straight line??

The ligand must be bidentate, so it forms 6 co-ordinate bonds in total

What??! They should! It's in my BOOKS - plural. Both CGP and Collins. Surely they BOTH can't be wrong.

I'll do even better, I'll list the colours of the coat in Joseph and the Amazing Technicolour Dreamcoat

I got taught straw coloured solution, but yet again had to adapt to the pale yellow-brown coloured solution given in my book I think it's better to remember the pale brown because it kind of helps you with the dark brown solution formed when it's oxidised

I got taught straw coloured solution, but yet again had to adapt to the pale yellow-brown coloured solution given in my book I think it's better to remember the pale brown because it kind of helps you with the dark brown solution formed when it's oxidised

On one paper (can't remember which) it said do not accept shades of brown such as straw.

so i should say it's pale brown not straw coloured?! argh omg gonna die the exam is in the afternoon isnt it plz omg what if i sleep through it omg

I got taught straw coloured solution, but yet again had to adapt to the pale yellow-brown coloured solution given in my book I think it's better to remember the pale brown because it kind of helps you with the dark brown solution formed when it's oxidised

What??! They should! It's in my BOOKS - plural. Both CGP and Collins. Surely they BOTH can't be wrong.

Hey, I just posted this in the edexcel thread by accident, so reposting it here now :P
I'm wondering, is an autocatalysis graph curve a positive or negative corrolation?
I know it starts at a slow rate, speeds up, and then slows down due to the reactants running out, but I've seen two contradicting answers in mark schemes.
...or could they be both right?

[Cr(H2O)6]2+ What colour is this. I've learnt it as a yellow solution but it said brown in a mark scheme I think

Also how is a spectrometer different to a calorimeter?

Guys, look at Jan 11 paper question 7, then look at mark scheme. It says don't accept shades of brown :/

coordination number is number of electron pairs donated, so if it's a bidentate ligand, there'll still be 6 coordinate bonds (i think)