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AQA AS Chemistry 7404/1 and 7404/2 - 27th May 2016 and 10th June 2016

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Original post by Bloom77
Does second ionisation energy follow the same trend as first ionisation energy for period 3 apart from sodium?







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has anyone posted a link to specimen paper 1 (set 2)?
(edited 7 years ago)
[QUOTE="Bloom77;65219227"]
Original post by Bloom77
Does second ionisation energy follow the same trend as first ionisation energy for period 3 apart from sodium?
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It's the same trends just shifted to the right so the elements that don't follow the trends will be in group 3 and 7 at the second I.E
Original post by sameer99
has anyone posted a link to specimen paper 1 (set 2)?

no - i dont know why to be honest
Original post by rosemondtan
is mass spec on the paper tomorrow?


yh it is i seen a leaked version of the paper!! how would we know it not like we made the paper madam
Reply 266
Original post by Why-_-Study-_-
Has any got a link to the chem specimen set 2 papers - i need a digital copy fast - please anyone


http://www.thestudentroom.co.uk/showthread.php?t=4074387&highlight=AQA+as+chemistry+specimen#primary_content


I think it would be the second ionisation energy because Tl has the configuration [Xe]6s^2 5d^10 6p^1

Youve removed from 6p, one electron, then you are removing fron 6s anothed electron, so it would be the 2nd ionisation energy. Remember that electrons are removed from the highest number first then in order of p, s, d.
Original post by Turtlebunny
I think it would be the second ionisation energy because Tl has the configuration [Xe]6s^2 5d^10 6p^1

Youve removed from 6p, one electron, then you are removing fron 6s anothed electron, so it would be the 2nd ionisation energy. Remember that electrons are removed from the highest number first then in order of p, s, d.


Ooh thank you makes sense
But how do you know Tl has an electron configuration of [Xe]6s^2 5d^10
Xe has 54 electrons
And Tl has 81
.???


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Guys, are there any values like constants which we will have to remember?
Which practicals are coming up in this paper? I saw it somewhere here but cant find it
Original post by rosemondtan
is mass spec on the paper tomorrow?


yes it is
Original post by Zakria123
Which practicals are coming up in this paper? I saw it somewhere here but cant find it


1. Titration
2. Measuring enthalpy changes
3. group 2, group 7, halides

good luck for tomorrow:smile:
Original post by sameer99
yes it is


wit isn't mass spec under organic analysis and thus under paper 2?
Original post by rosemondtan
wit isn't mass spec under organic analysis and thus under paper 2?


thats true but TOF mass spec is in the first chapter also, atomic structure, and this chapter is on paper 1
just remember the stages and what the graphs for relative abundance show
Can anybody help me with the time of flight equation? Don't understand how you do the calculations for it
to calculate relative atomic mass of, e.g. magnesium;

"graph of mass spectrum, % abundance y-axis mass/charge x-axis"

79% of 24 mass/charge
10% of 25 mass/charge
11% of 26 mass/charge

Step 1:

total mass of 1st isotope: 79x24=1896
total mass of 2nd isotope: 10x25=250
total mass of 3rd isotope: 11x26=286

Step 2:

1896+250+286=2432

Step 3:

(79+10+11=100) therefore;

2432/100 = 24.32

therefore Ar of Magnesium=24.3 (3 s.f.)

i hope this helps :smile:

good luck for tomorrow

Original post by simranjohalx
Can anybody help me with the time of flight equation? Don't understand how you do the calculations for it

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