Edexcel A2 Chemistry Exams -6CH04 (14th June) and 6CH05 (22nd June) Discussion Thread

Reply 1560

samb1234

OP

13

Original post by sabahshahed294

Anyone?

see below

Reply 1561

sabahshahed294

12

Original post by samb1234

see below

Ty so much!

Reply 1562

Ayman!

15

Original post by C0balt

Where can i get Jan 16?

I've attached it below. :smile:

Original post by samb1234

You want the max amount of the complex, which has one metal ion and 2 two ligands. Therefore the max is going to be when the ratio of metal to ligand is 1:2, so B (as for example if I have 50/50 then I can only have 2.5cm^3 of the metal reacting with ligand)

I get it now - that was my initial notion as well, to have 1:2 since the conc. is the same.

WCH05_01_que_20160127.pdf529.2KB

WCH05_01_msc_20160302.pdf276.1KB

Reply 1563

Ayman!

15

Original post by Don Pedro K.

Mate 78 is like a solid score for me on the NORMAL ONES LOL YOU'RE INSANE!!!!! (In a good way)

ikr? I would be happy with that in my U4, let alone U5 hahahah

if Samb is this good in his 4th subject, i can't imagine what a god he'd be in others xD

Reply 1564

C0balt

16

Original post by Ayman!

I've attached it below. :smile:

I get it now - that was my initial notion as well, to have 1:2 since the conc. is the same.

Cheers man

Reply 1565

samb1234

OP

13

Original post by Ayman!

I've attached it below. :smile:

I get it now - that was my initial notion as well, to have 1:2 since the conc. is the same.

were there any questions from the jan 15 one btw? I personally didn't like the whole paper seemed a lot harder than most of the ones i've done before

Reply 1566

Don Pedro K.

9

@Ayman! Chemistry is his 4th subject?!?! Wat the flipping heck xD He's on a whole 'nother level hahaha

Reply 1567

C0balt

16

Um this is a slightly late question but what do ppl think will be full UMS mark for unit 4

Reply 1568

Ayman!

15

Original post by samb1234

were there any questions from the jan 15 one btw? I personally didn't like the whole paper seemed a lot harder than most of the ones i've done before

Only number 2. I think I figured it out though. I think you need to consider the number of OH- as well. I'll be coming out with a whole list of problems I've run into once I'm done with the past papers. 😂

How's your physics 4 btw? Mine is actually pretty decent atm.

Sent from my SM-G920I using Tapatalk

Reply 1569

C0balt

16

Original post by Ayman!

Only number 2. I think I figured it out though. I think you need to consider the number of OH- as well. I'll be coming out with a whole list of problems I've run into once I'm done with the past papers. 😂

How's your physics 4 btw? Mine is actually pretty decent atm.

Sent from my SM-G920I using Tapatalk

OH- doesn't matter you just have to consider the oxidation states

N goes from +5 to - 3 so 8 electrons on the LHS
Al goes from 0 to +3 so 3 electrons on the RHS
Common multiple is 24 so multiply first half eq by 3 and second by 8 to cancel the e- therefore D

Reply 1570

samb1234

OP

13

Original post by Ayman!

Only number 2. I think I figured it out though. I think you need to consider the number of OH- as well. I'll be coming out with a whole list of problems I've run into once I'm done with the past papers. 😂

How's your physics 4 btw? Mine is actually pretty decent atm.

Sent from my SM-G920I using Tapatalk

Nah you can ignore the OH-. Looking at ox states, OH is same, Nitrogen is -8 and Al is +3. So Al loses 3 electrons, and nitrogen gains 8 so by lowest common multiple electrons transferred are 24, so 8 Al and 3 nitrogen. Physics 4 is fine atm, currently on my third paper for it

Reply 1571

Spoderman14

1

Original post by Supermanxxxxxx

Honestly I have no clue

Posted from TSR Mobile

Ok, so if you add hcn in kcn, the cn- attacks the carbonyl group, eventually forming thr hydroxy-nitrile. You can then hydrolyse the cn group to the carboxylic acid group with an aqueous acid under reflux.

Reply 1572

ramadeen

1

Original post by sabahshahed294

IAL Unit 5 papers are depressing. :sigh:

I did two of them and I feel like I know nothing! :colonhash:

:'(

exactly! are they meant to be harder or what? it made me feel so unprepared.

Reply 1573

samb1234

OP

13

Original post by Don Pedro K.

@Ayman! Chemistry is his 4th subject?!?! Wat the flipping heck xD He's on a whole 'nother level hahaha

Thanks I guess haha, Hope unit 5 goes well for you, as well as all the other annoying exams next week

Reply 1574

Don Pedro K.

9

To be honest, I'm not gonna bother with the IALs. We only have 3 days or something until our exams and I have UK ones still to do + I don't want to be demoralised so close to the exam.. XD

Reply 1575

Don Pedro K.

9

Original post by samb1234

Thanks I guess haha, Hope unit 5 goes well for you, as well as all the other annoying exams next week

Thanks mah dood! You too :smile:

Reply 1576

ramadeen

1

Original post by Don Pedro K.

To be honest, I'm not gonna bother with the IALs. We only have 3 days or something until our exams and I have UK ones still to do + I don't want to be demoralised so close to the exam.. XD