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<a https://www.thestudentroom.co.uk/showthread.php?t=7467335'> Year 12s: what will be the first way you research your future options? >>
<a https://www.thestudentroom.co.uk/showthread.php?t=7467335'> Year 12s: what will be the first way you research your future options? >>

A2 TM Chemistry Question

Hi there,

Due to results, I've had to rethink my courses next year and will now continue chemistry. I've opened up the summer work but am struggling a bit, as I don't have the textbook yet, and missed the last few lessons after exams (I was then under the impression I had finished chemistry).

a Give the formulae of two copper compounds in which copper has different oxidation states. Give the oxidation states and the colours of the two compounds. [6]

b Give the formulae of two iron compounds in which iron has different oxidation states. Give the oxidation states and the colours of the two compounds. [6]

Can someone please walk me through these two questions?

Thanks,

Dan
Reply 1
Avatar for Bradshaw
Bradshaw
6
This is pretty much a knowledge based question (things you need to learn).

You need to know that copper can exist in oxidation states I and II (Cu+ or Cu2+)
You need to know that iron can exist in oxidation states II and III (Fe2+ or Fe3+)

Can you write down the compounds for these with oxygen for example (balance the valencies)?

For the colours you'll have to look them up, I'm pretty sure that Cu+ is green and Cu2+ is blue but I could be wrong! Again, these are things you just need to learn!

Hope that helps!
Original post by Bradshaw
This is pretty much a knowledge based question (things you need to learn).

You need to know that copper can exist in oxidation states I and II (Cu+ or Cu2+)
You need to know that iron can exist in oxidation states II and III (Fe2+ or Fe3+)

Can you write down the compounds for these with oxygen for example (balance the valencies)?

For the colours you'll have to look them up, I'm pretty sure that Cu+ is green and Cu2+ is blue but I could be wrong! Again, these are things you just need to learn!

Hope that helps!


Cu+ is usually white (full 'd' shell) althought the oxide is red...
Reply 3
Avatar for danlocke
danlocke
OP
3
So could I have for the first part, copper (I) oxide Cu20 and copper (II) oxide CuO, copper (I) chloride CuCl and copper (II) chloride CuCl2?
(edited 10 years ago)
Reply 4
Avatar for danlocke
danlocke
OP
3
Is there a specific page on chemguide or something I can read to help me understand this, as I don't yet have the textbook.

Thanks
Original post by danlocke
Is there a specific page on chemguide or something I can read to help me understand this, as I don't yet have the textbook.

Thanks


Start from the page http://www.alevelchem.com/aqa_a_level_chemistry/unit3.5/s354/01.htm

which is the A2 transition metals ...

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