AQA - Unit 5 - Energetics, Redox and Inorganic Chemistry

Yeah sometimes they do have a "wrong answer" list, but not always, so I guess my point still makes sense.

I do get what you're saying but from looking on here it looks like half the people forgot to divide by two, therefore a high proportion of answers the be the wrong same answer, not really a list. Also someone on here said they carry error forwards, i know they do it for ocr physics so why should aqa chemistry be any different.

Reply 1761

Swoosh

2

Do you think electrolysis is ok for the Aluminium Oxide ions question?

Reply 1762

Cameronn

ah people actually put the melting thing too?! :biggrin:

yeah, I said if its Al2O3 then as a solid it won't conduct electricity, so melt it in a furnace/oven in a lab at a high temperature until its molten - then test for its conductivity and if it conducts now then it was indeed made of ions. Thought I'd made all that up, but it seems I could be right. ahh! and I think electrolysis might possibly be fine :smile:

Reply 1763

Willyg11

Did everyone get 53.7 percent, or something like that, for the section B calculation?

Reply 1764

KissMyArtichoke

11

Original post by Cameronn

ah people actually put the melting thing too?! :biggrin:

yeah, I said if its Al2O3 then as a solid it won't conduct electricity, so melt it in a furnace/oven in a lab at a high temperature until its molten - then test for its conductivity and if it conducts now then it was indeed made of ions. Thought I'd made all that up, but it seems I could be right. ahh! and I think electrolysis might possibly be fine :smile:

Yeh I pretty much put that, I was going to just say dissolve it but I couldn't remember if it was soluble and I know it would work if it was molten. I don't know if that's what they were looking for though, they didn't give a lot of space to explain it.

Reply 1765

User544981

10

what was the oxidation state for palladium and what were the shapes
i put oxidation state +2 and trigonal bipyramidal and tetrahedral did anyone else get this

Reply 1766

KissMyArtichoke

11

Original post by hahaff

what was the oxidation state for palladium and what were the shapes
i put oxidation state +2 and trigonal bipyramidal and tetrahedral did anyone else get this

I think the other shape was square planar or something? Whatever cisplatin is. Tetrahedral is right though.

Reply 1767

Swoosh

2

Ah I think I've done it wrong then. I said Al2O3 would be the electrode for electrolysis and something about it conducting a current. blah.

Reply 1768

soutioirsim

15

Why couldn't you recharge the "Pb" thingy ma bob?

Reply 1769

Swoosh

2

I said it was because all the lead had been used up or something along those lines

If you get the correct equation, but don't balance it, do you still get some marks?

(edited 12 years ago)

Reply 1770

Zakir

2

hey guys...

for the 'why does the emf decrease?'

i put because 'the reactants are being used up...'

is that right?

Reply 1771

Jin3011

21

Original post by Zakir

hey guys...

for the 'why does the emf decrease?'

i put because 'the reactants are being used up...'

is that right?

Probably yeah.

Reply 1772

Betsss

Original post by Zakir

hey guys...

for the 'why does the emf decrease?'

i put because 'the reactants are being used up...'

is that right?

I put the cell runs out :tongue:

Reply 1773

Zakir

2

Original post by Betsss

I put the cell runs out :tongue:

Lol, sorry that made me giggle!
U myt get it ryt?

Reply 1774

Betsss

Original post by Zakir

Lol, sorry that made me giggle!
U myt get it ryt?

hehe, it was a last minute frantic attempt.. better than leaving it blank :tongue:

Reply 1775

loukas2993

3

Original post by hahaff

what was the oxidation state for palladium and what were the shapes
i put oxidation state +2 and trigonal bipyramidal and tetrahedral did anyone else get this

I think the trick to this question is recognising that it is the shape of the PALLADIUM COMPLEX only in the compound. In which case, the palladium complex has a coordination number of four and so the two possible structures are tetrahedral and square planar.

Reply 1776

nessa17licaria

Original post by Betsss

LOL i wrote some crap about hydrogen bonding... h bonds form between electronegative F, and electropositive hydrogen on the water :tongue:

that's what ive written.. last minute :s-smilie:

Reply 1777

fsaeed20

Does any one remember how many marks the question about calculating entropy and gibbs free energy change was and how many marks i stand to loose if i didnt divive the moles by 2.

Reply 1778

crazyfrog5

Don't know mate, looks like a lot of people messed those up, you could loose quite a lot if the mark scheme is strict, but you may get error carried forward

Reply 1779

artykid23

Pb02 + Pb + 2H+ + 2HSO4- ----> 2PbSO4 + 2H2O

AQA - Unit 5 - Energetics, Redox and Inorganic Chemistry

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