Chemistry Unit 1 (IAL) May 2015

What did you guys write for the differences in IE for Aluminium and for silicon? Just losing one electron to acquire a stable full e. config, for aluminium and for the next, a half-filled e. conf. which is more stable right? :O

I also wrote that the 3p electron is shielded by inner 3s electrons (aluminium)

but both the elements they mentioned had the same amount of shielding. so they affected the same way... they were elements across the period. I gave the spdf e. config. in addition. do you think that's eonugh for 4 marks?

Yeah there is some degree of shielding by inner electrons(even though both elements enter the same shell), you could also talk about high energy level(3p) in aluminum. In the question about sulfur and phosphorus you could say that sulfur's outer electron is being paired up with another electron in the same 3px orbital, thus there is a slight repulsion between the two negatively charged electrons.(first i.e. hence is lower)
To be completely honest I don't know, but your statements were right (about the stability etc) Let's hope for the best

once again, sulfur and phosphorus were 3p4 and 3p5... so they both had repulsion....
I didn't write those statements because I was so skeptic maybe I thought too much and your answer is the prefered one. haha yess fingers crossed! good luck for unit 2!

Phosphorus is 3p3 and Sulfur is 3p4 there is an extra repulsion because the 4th 3p electron in sulfur is starting to doubly fill the first 3p orbital..hope now it makes sense
Good luck for unit 2 as well! We can do it Praying that the paper will be easy and with the low grade boundaries

AHHH I wrote them wrong! :'( oh well... that's in total 7 marks lost :P
Yup I normally score better for unit 2. wbu? yeah hope the same :O

7?:O I believe the question was overall 4 marks! Don't worry they will give you the marks cause your main statements were right. It's always better thank you think it is
aghh..unit 2…i find it okay but don't like the fact that you need to memorise a lot of stuff (reactions with halogens, purification of halogenoalkanes and etc :'c) How are you preparing for unit 2?

7 from the entire paper approximately :P I'm a visual learner so I sort of remember from the practicals we did in school...
I'll be going through the notes I have and the textbook... and then sort of skim through the past papers. I have done all of them I think c: (such a nerd)
It helps to know what sort of learner you are. Then memorising is not really an issue

oh i see Doing the past papers will definitely benefit you
Good luck with your other exams !

yup you have to. They gave it for 1/2Cl2

Why two my friend? Isn't it 3/2 ? To make it a two
Because they gave us the enthalpy for 1/2 and we need to make it two so 3/2xthe value

1/2 Cl2 --> Cl
(1/2) x2 Cl2 --> 2Cl
so it's x2

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2 marks

Oh snap Im so dumb,how many marks was that question?
And how many will I loose ?