AQA Chem (mod 4,5 and 6 discussion)

How are people coping with aqa chem, I am finding module 5 and 6 very tough and as module 5 is out of 120 its very hard also. What have been the grade boundaries in previous years?

Reply 1

sunday

What do you mean tomorrow?

Reply 2

Ghetto_Princess12

dimz

Hey guys, whos doing this paper tommorow and what are your thoughts.

Are you talking about module 4?

Reply 3

Maestor

ouch...module 5 is LONG LONG and LONG!..SECTION B IS HUGEEEEEEEEE!!!...but module 4 is nice..already have a B hoping to push that up to a strong A....and..module 6 well i havnt even started...i hope retaking my AS will help me save time...(kinda not feeling good about this one)

Reply 4

Ghetto_Princess12

Maestor

ouch...module 5 is LONG LONG and LONG!..SECTION B IS HUGEEEEEEEEE!!!...but module 4 is nice..already have a B hoping to push that up to a strong A....and..module 6 well i havnt even started...i hope retaking my AS will help me save time...(kinda not feeling good about this one)

I feel exactly the same, section B can be based on anything we've done over the past two years and thats kind of scary to think about since I've forgotten most of the things we did. I retook module 3 on Wednesday and hopefully that'll push my grade up or made it stay the same incase I slip in module 5 or 6. By the way did anyone find last years exam paper for module 5 hard? The grade boundaries were pretty low.

Reply 5

Sycren

11

For some very weird reason my marks have increased from module 1 where I got 70% to module 4 where I got 86%......but 5 and 6 I can only get C's in at the moment. If you were to relearn all of module 4 you could probably get half marks on module 5 and 75% on module 6.

Get a synoptic paper and count which are the calculation questions and so on, and it appears to be the same in most papers. Im only really loosing marks becaue of transition metal chemistry.

Reply 6

Maestor

lol i cant do them either!!..well i havnt really tried tackling them yet...i can do entropy though

Reply 7

Sycren

11

naf and h2so4?

Reply 8

knocker

All undergo a displacement reaction to produce the hydrogen halide (HCl, HBr, HI) and the sodium salt (Na2SO4)

However only HBr and HI then go on to do a redox reaction...

HBr produces SO2 and Br2 as redox products
HI produces SO2, S, H2S and I2 as redox products

It's best to work out the equations for the redox reactions by constructing half-equations and then combining them

(look back at your module 2 notes for more info)

Reply 9

Sycren

11

notes for module 2, will this help? http://thestudentroom.co.uk/showthread.php?t=399131

Reply 10

Ghetto_Princess12

dimz

thanks guys!, one question, any one got any tips on born haber cycles?

I don't think we can give you any specific tips on how to work out born Haber cycles, but my way of revising for them is just practicing questions again and again and then see if there's a pattern in working them out.

Reply 11

Maestor

there like 10 of them..o well..ill get around it sooner or later

Reply 12

Giggsy11

2

I think the majority of the time they want you to name different stages in the cycle. Thats at least better than drawing a whole cycle (jinxed it now)
Got a question about colours
the equation DeltaE=hv
I know h is the Planck's constant and v is frequency of light absorbed
But is DeltaE like the change in energy of the electrons from the ground state to the excited state?

Reply 13

Maestor

Fe2+ = yup
Fe3+ = yup
Al3+ = yup
Co+ = yup
Cr3+ = yup (can appear green)
Cu2+ = yup

Reply 14

sunday

I thought Cr3+ was blue/violet but can appear green?
Hmm

Reply 15

dimz

OP

no cr3+= ruby

Reply 16

Sycren

11

here are module 5 notes; http://thestudentroom.co.uk/showthread.php?t=246724

Reply 17

all_or_nothing

I'm so scared about mods 5 & 6!
They seem so hard!
One bonus is that at least you get two hours for mod 5, but there is so much to learn.
Anyone how a good way to remember the colours of different metal ions?

Reply 18

cujo

unit 6 is so effing hard.

Reply 19

sunday

I know

Highest I've got so far is 24/40, I then go back and check through with the right answers, and most of the time I can't even figure out how they got the answer they did!

AQA Chem (mod 4,5 and 6 discussion)

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