AQA CHEM5 A2 Chemistry - 19th June 2013

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Reply 500

Chewy29

This is driving me insane :angry:

. why do some of the hexaaqua ions have two colours?

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Reply 501

erniiee

Original post by laurawoods

What's going on in pg 64? :smile:

It explains why the hexaaminecobalt(III) ion, despite being yellow in colour, appears to darken a straw solution of hexaaminecobalt(II) upon oxidation.

Reply 502

laurawoods

Original post by erniiee

It explains why the hexaaminecobalt(III) ion, despite being yellow in colour, appears to darken a straw solution of hexaaminecobalt(II) upon oxidation.

Hmm that's what I was talking about?

(edited 10 years ago)

Reply 503

laurawoods

Original post by Chewy29

This is driving me insane :angry:

. why do some of the hexaaqua ions have two colours?

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EXAMPLE?

Reply 504

laurawoods

Original post by Hart1995

Do we need to know all the definitions within thermodynamics? There seems to be a lot :/ WAAAA

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It's not hard to learn those definitions, just think in your head an eqaution which corresponds to that def...this will make it much easier.

Reply 505

F_shakeey

I know this is going to sound pretty bad but how are people learning colour changes for metal aqua ions? Struggling to remember them obh...

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Reply 506

I have a question

Original post by laurawoods

Hello , my rules have no fault!

But this question doesn't work because you cannot have two oxidations! It has to be one oxidation and one reduction happening simultaneously, hence the term redox.

Check the question again, is my suggestion. :smile:

And, I don't understand by what you are saying in red.

Sorry, I copied the question out incorrectly!

Is this correct? (Edit - My handwriting is really small, tried to write as big and clearly as possible :colondollar:

)

Spoiler

(edited 10 years ago)

Reply 507

JenniS

Original post by F_shakeey

I know this is going to sound pretty bad but how are people learning colour changes for metal aqua ions? Struggling to remember them obh...

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I've had to just write them out over and over again and make flip cards with them on, repetition was the only way I could get them to sink in!

Reply 508

I have a question

Original post by F_shakeey

I know this is going to sound pretty bad but how are people learning colour changes for metal aqua ions? Struggling to remember them obh...

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I am literally listing every single colour and its relevant metal aqua ion thingy and constantly repeating them, you notice there is a pattern amongst the M2+ and M3+ aqua ions.

Reply 509

F_shakeey

Original post by JenniS

I've had to just write them out over and over again and make flip cards with them on, repetition was the only way I could get them to sink in!

Original post by I have a question

I am literally listing every single colour and its relevant metal aqua ion thingy and constantly repeating them, you notice there is a pattern amongst the M2+ and M3+ aqua ions.

I see, thanks guys I think you're right. The best way is just writing them down so they stick in your head. I'll be doing that today :yep:

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Reply 510

laurawoods

Original post by I have a question

Sorry, I copied the question out incorrectly!

Is this correct? (Edit - My handwriting is really small, tried to write as big and clearly as possible :colondollar:

)

Spoiler

oxidation numbers look ok but where are the protons and electrons?

Reply 511

erniiee

I was hating on the redox equilibria section of the NT book..but it isn't actually so bad!

Reply 512

I have a question

Original post by laurawoods

oxidation numbers look ok but where are the protons and electrons?

Right hand side of the page, I've added the electrons, I don't think I need to add any protons.

Bottom of the page (in green), I've merged the equations for iodine and the sulphur containing compound.

Reply 513

laurawoods

Original post by I have a question

You need to look through my step by step rules once more....The iodine one looks ok but have a look at the other one again!

(edited 10 years ago)

Reply 514

I have a question

Original post by laurawoods

You need to look through my step by step rules once more....

Spoiler

The mark scheme says I'm correct, but okay I'll go through the rules again. Thanks laurawoods.

Reply 515

laurawoods

Original post by F_shakeey

I see, thanks guys I think you're right. The best way is just writing them down so they stick in your head. I'll be doing that today :yep:

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Hello, did your class do experiments with the transition metal ion complexes? If your class did those expts , then it genuinely would be so easy to think back to what colour things were and what happened when different ligands etc were added! For example: hexaaqua for cobalt is that neat pink colour and for copper it is that beautiful blue colour etc... Just trying to remember or learn parrot fashion doesn't help. But if you think back to the experiments and what the different test tube reactions looked like, then hey presto suddenly it becomes very easy and yeah neat! Hope that helps! :smile:

Reply 516

y_ahmed

It feels sooooo good to have unit5 revision out of the way wohoooo just past paper practise now

Reply 517

Chewy29

I have my empa tomorrow, its such a blag.

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Reply 518

wittyguy

Original post by Chewy29

I have my empa tomorrow, its such a blag.

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Yeah same, not too sure what to prepare for the practical part of the paper. All I've done is learnt all the basic chemical tests for what will probably be task 2. Not too sure what else I can prepare for tomorrow?