AQA - Unit 5 - Energetics, Redox and Inorganic Chemistry

Reply 1640

MrLukee

Original post by A level Az

Yeah I actually began writing down the full equations first before I saw the word "ionic" :tongue:

Reading the question has always been my problem :wink:

.. hey ho, I think ill still manage to get a C

Reply 1641

bashx

Original post by Zakir

does anyone know the UMS marks for EACH module (i.e. empa's and exam)...at AS and A2..

just trying to work out what grade i might be expecting...

thanks!

tpQA ums a2 converter on google and it should help you

Reply 1642

Betsss

Original post by A level Az

It was 33600Jmol^-1 or 33.6kJmol^-1

If you used the value they gave you you got answer in the 40000s (I think).

yes! me too

Reply 1643

Stirlo

I didn't notice the ionic equation thing either D: Ah well. I realise I gain marks for something I thought I did wrong and then lose whatever I've gained by not reading another question properly :rolleyes:

Reply 1644

Zakir

2

Original post by A level Az

It was 33600Jmol^-1 or 33.6kJmol^-1

If you used the value they gave you you got answer in the 40000s (I think).

if i forgot to divide it by two...no marks???

Reply 1645

MrLukee

Original post by Betsss

yeah, i got that too, apart from AlCl3 (as Cl has a 1- charge)
and divided the 2nd equation by 2, as its the simplified ratio

Does the Na+ get cancelled out as a spectator ion?, because im pretty sure the point of that eqn is that it produces a sodium/aluminium salt?

Reply 1646

Betsss

Original post by MrLukee

Does the Na+ get cancelled out as a spectator ion?, because im pretty sure the point of that eqn is that it produces a sodium/aluminium salt?

the Na+ ion is "unchanged" in terms of oxidation state, so it acts as a spectator ion ( i think)

Reply 1647

MrLukee

Original post by Betsss

Also, do people remember getting a Delta G value of + 33.6?
and a temp of 298.3?

I got your temp, but I cant say if I got 33.6 or not :/

Reply 1648

MrLukee

Original post by Betsss

the Na+ ion is "unchanged" in terms of oxidation state, so it acts as a spectator ion ( i think)

I suppose so, that sounds about right to me

Reply 1649

spocckka

14

Well this has ruined my summer.

Reply 1650

fsaeed20

How many marks would I lose if I didn't divide the moles by 2. Technically I would get the next question wrong aswell as we had to use the answer from the question above.

Reply 1651

MrLukee

Original post by fsaeed20

How many marks would I lose if I didn't divide the moles by 2. Technically I would get the next question wrong aswell as we had to use the answer from the question above.

one most likely :biggrin:

and youd get an E.C.F

Reply 1652

fsaeed20

CAN SOMEONE ANSWER MY QUESTION

How many marks would I lose if I didn't divide the moles by 2. Technically I would get the next question wrong aswell as we had to use the answer from the question above.

Reply 1653

A level Az

16

Original post by Zakir

if i forgot to divide it by two...no marks???

You'll get method marks, so maybe 1/3 or 2/3 depending on how they do it (I think it was out of three?)

I was under the impression that you'd only get full marks if you used the correct answer, or the value they gave you, as it would be a nightmare for examiners to work out calculations to figure out of people have been using the right method with their incorrect answer.

(edited 12 years ago)

Reply 1654

fsaeed20

Original post by MrLukee

one most likely :biggrin:

and youd get an E.C.F

Are you sure aqa give error carried forward.

Reply 1655

MrLukee

Original post by fsaeed20

Are you sure aqa give error carried forward.

Yeah, its in the old mark schemes :smile:

Reply 1656

duskflower

6

Can someone answer my question?

If I did really well in my AS units - I got around 90 UMS - and did quite good in Unit 4 - say around 90, what would I be able to get away with in this module? Like could I get a B/C and still get an A overall?

Thanks x

Reply 1657

MrLukee

Original post by duskflower

Can someone answer my question?

If I did really well in my AS units - I got around 90 UMS - and did quite good in Unit 4 - say around 90, what would I be able to get away with in this module? Like could I get a B/C and still get an A overall?

Thanks x

It really just depends on how many ums marks you have in total :biggrin:

Reply 1658

User544981

10

Original post by duskflower

Can someone answer my question?

If I did really well in my AS units - I got around 90 UMS - and did quite good in Unit 4 - say around 90, what would I be able to get away with in this module? Like could I get a B/C and still get an A overall?

Thanks x

overall u need 480/600 for an A

thats out of all ur modules

Reply 1659

A level Az

16

Original post by duskflower

Can someone answer my question?

If I did really well in my AS units - I got around 90 UMS - and did quite good in Unit 4 - say around 90, what would I be able to get away with in this module? Like could I get a B/C and still get an A overall?

Thanks x

I'm going to assume you mean 90%? Because 90/140 UMS for Unit 2 is a C grade, and 90/120 for Unit 4 is only a B.

If you got around 90% in all the modules, then it would be something like this:

Unit 1 - 90
Unit 2 - 126
Unit 4 - 108
Unit 3 and 6 I'll assume you got around 80%, as they are pretty difficult, so 96.

480/600 is an A overall, so...

480 - (90+126+108+96) = 60 UMS, which is a D grade.

If you got 90 UMS in all modules, then:

480 - (90+90+90+90) = 120, which is full marks, though I don't think you meant this :redface:

To be honest, you could just go onto the AQA website and use the UMS converter to figure out what kind of UMS you think you have so far, and how much you would need for the grade you want.

(edited 12 years ago)

AQA - Unit 5 - Energetics, Redox and Inorganic Chemistry

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