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Aqa Chem - Module 1

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I didn't understand the first part - my chem teacher said it was a "basterd of a question" to use his expression.
Observations - Fizzing
Product - NaCl
Equation - Cn't remember (btw I got tht first part wrong)

2nd:-

Observations - White precipitate produced
Reactant - BaSO4
Eqatuin- NaSO4 + BaCl =======> NaCl + BaSO4

aye

if hcl is 0.267 moles
what is the mass of na2co3.10h2o required for neutralisation

Reply 23

Pollypeptide

**** nos':L
It's done now anyways. No point in protagonising, I was just wondering how people rated the exam itself

Reply 24

Toxic

IMO the whole exam was just out of context, after having done all exam past papers on the AQA website, the context of this exam was totally different. Usually first 2question is about the charges of protons and the relative masses of electrons. Also they ask you to deduce an element and find the element and loads of other stuff were different but there were some ordinary questions like why has silicon got a high mp. I just hope that the grade boundary is going to be A LOT lower.i would estimate 73% for an A.(I hope)

Reply 25

ben_stretch

0.5 x 0.267= 0.1335 moles of Na2CO3, 1335 x 106.0= 14.15. 14.15 x 100/37.1= 38.1g is what I put if I remember correctly

Reply 26

theultimate

ben_stretch

0.5 x 0.267= 0.1335 moles of Na2CO3, 1335 x 106.0= 14.15. 14.15 x 100/37.1= 38.1g is what I put if I remember correctly

yep or just 0.1335 x 286
i think

Reply 27

Pollypeptide

73% for an A. Now that is wishfull thinking:L
Yes, your totaly right, it was completely different to those of previous years. More application of knowledge, then realing of a list of facts?

Reply 28

theultimate

polarised cl-

dues to large charge to size on cation?

Reply 29

ben_stretch

aye, my words were 'large charge to size ratio would do it'

Yup.

Mass to charge boys:P Sicentits dont like genreal terms such as "size" and amount:L
But, yeah, you will of course get the mark

Reply 32

cvat

i don't think its NaCl for the part a of qu 4, as NaCl is aqueous so u can't see it, i put bubbles and carbon dioxide,

also what did people get for the ideal gas equation question?

Reply 33

ben_stretch

can anyone remember the figures for the ideal gas question? 298K, how many KPa? and something x 10 -2 moles of CO2?

Reply 34

Pollypeptide

1.???x10-3??? sumtihing like tht ... m3

100Kpa

1.90 x 10-3 or -4 i think i got

Reply 37

cvat

ben_stretch

1.90 x 10-3 or -4 i think i got

good thats what i got but some people managed to get 1.7x 10^-3 was a bit worried lol

and i think it was 101kpa, also surprised they didn't give R, although probably should know it anyway