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# AS Chemistry- helping each other out! watch

1. Hi! I'm getting quite confused with first ionisation energies, would neon have the highest one out of all the first 18 elecments of the periodic table? thanks
2. (Original post by C0balt)

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http://www.ocr.org.uk/Images/61532-q...and-groups.pdf

any other question you are stuck on
Not sure how m/e works, whats the rule for what deflects least and most. Lost mark on first question :

Which of the following ions would be deflected least in a mass spectrometer?
A 35Cl+
B 35Cl2+
C 37Cl+
D 37Cl2+
4. (Original post by nishofficial)
Im not completely sure, Edexcel must just be testing ability to think outside the spec and charged plate would be a more correct answer than the others
did you do question 19 a i dont know how to work ot out
can you show me the method please
draw it and you ll understand
I've tried to and I still don't get it
6. btw do they ask you how do van der Waals forces arise unit 1 or 2
did you do question 19 a i dont know how to work ot out
can you show me the method please
Im just doing MCQ atm bro, havnt got that far haha
8. (Original post by bob smith 23)
Hi I'm doing aqa chemistry as level, but there is an example in the CGP book of a shape of molecule that I don't understand: why is SO32- trigonal pyramidal?
hold on its not trigonal pyramidal its just pyramidal with angle 107
with 3 bonding pairs and one lone pair
9. (Original post by nishofficial)
Im just doing MCQ atm bro, havnt got that far haha
whats MCQ
10. Panicking. Think I've forgotten everything
11. Calculate the number of atoms in one mole of hydrogen peroxide, H2O2. [The Avogadro constant, L = 6.0 × 1023 mol–1]
A 1.5 × 10^23
B 6.0 × 10^23
C 1.2 × 10^24
D 2.4 × 10^24

I thought avogadros number was the number of particles in a mole but its incorrect for this. Why?
whats MCQ
multiple choice
13. Someone who knows there stuff to go over Hess' law? Probably hardest topic & surely benefit TSRians (especially me!)
14. (Original post by nishofficial)
Calculate the number of atoms in one mole of hydrogen peroxide, H2O2. [The Avogadro constant, L = 6.0 × 1023 mol–1]
A 1.5 × 10^23
B 6.0 × 10^23
C 1.2 × 10^24
D 2.4 × 10^24

I thought avogadros number was the number of particles in a mole but its incorrect for this. Why?
IT JUST SHOW TO 1DP BRO its one atom has 6.0 time 10 to 23
this mean as there re 2 hydrogen and 2 oxygen there are 4 atoms so time 6.0 time 10 23 by 4 which give u answer D
15. (Original post by alevels2k15)
10 In an experiment, 1.226 g of potassium chlorate(V), KClO3, was heated.
A mass of0.320 g of oxygen gas, O2, was collected.2KClO3(s) o 2KCl(s) + 3O2(g) Use the molar mass of KClO3 = 122.6 g mol−1 and relative atomic mass O = 16. The percentage yield of oxygen in this experiment is
A 17.4%
B 26.1%
C 66.7%
D 100%

Ignore the top it was for someone else

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16. (Original post by nishofficial)
multiple choice
OHH RIGHT dont waste on that

coz i did for practise and was acomplete waste no offence do the long answer you might get a bit of knowlegde
17. I'm so tempted to break my arm or something tomorrow morning and to get my predicted grade! haahhaaha, I'm so unprepareddddd
18. (Original post by Lilieeeeeee)
I'm so tempted to break my arm or something tomorrow morning and to get my predicted grade! haahhaaha, I'm so unprepareddddd
lool that much effort for chemistry hahaha and good luck
19. (Original post by C0balt)

Ignore the top it was for someone else

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you know everysingle question like a boss
20. Write out the spdf notation for aluminium
1s2 2s2 2p6 2s2 2p1
Electron is removed from outside to inside, so third, fourth, 10th 11th and 12th and 13th are removal from s orbital

Al2+(g)->Al3+(g)+e-

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