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The Chemistry AS-level Thread

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Original post by techno836

Define electronegativity ( 2 marks )

The power of an atom to attract the electrons in a covalent bond :smile:



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Original post by THEMathlete
The power of an atom to attract the electrons in a covalent bond :smile:



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Correct :smile:
My final score for OCR A ISA's is 37/40.....what are my chances of still getting an A? Everyone else in my class has 38/39/40 :frown:


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Original post by Mutleybm1996
My final score for OCR A ISA's is 37/40.....what are my chances of still getting an A? Everyone else in my class has 38/39/40 :frown:


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The ISA grade boundaries don't often change, you'll never need more than 37 for an A, it's usually 36. Don't worry too much your exams are worth more and are much easier to work towards and improve i find :smile:
I've got my EMPA tomorrow and I'm pretty sure I'm gonna fail miserably. :frown:
Reply 1325
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AbbiC
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Original post by techno836
The ISA grade boundaries don't often change, you'll never need more than 37 for an A, it's usually 36. Don't worry too much your exams are worth more and are much easier to work towards and improve i find :smile:

Last year you needed 35 for an A, and the years before 34 marks were needed. I don't think it would have gone up by two marks since last year.
I am stuck on a question asking me to decribe the appearance of Ammonium Iron(II) Sulfate crystals worth 2 marks.

I know they are light green/blue green but what extra information should I add for the 2nd mark.

PLEASE HELP!!!!!

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Email me at javedkid @hotmail.com

Willing to trade chemistry for physics.

*Note I will realise if you try to bump me off with bs questions so dont try.

Have a nice day .
Original post by rosie.96
I've got my EMPA tomorrow and I'm pretty sure I'm gonna fail miserably. :frown:


Good Luck :cool:
Original post by Tha Realest
Good Luck :cool:

Thanx :smile: I'm gonna need loads of it :biggrin:
Does anyone know what can you do if the teacher has lost part of your EMPA?

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Original post by Obliviate
Does anyone know what can you do if the teacher has lost part of your EMPA?

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Do really well in the exams


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Original post by THEMathlete
The power of an atom to attract the electrons in a covalent bond :smile:



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Not just covalent
Reply 1333
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Hudl
16
Original post by langlitz
Not just covalent


I swear aqa have covalent bond underline in the mark scheme
Original post by Mutleybm1996
When assigning oxidation numbers to NaClO would Na or Cl take priority?

So O is -2
Na is +1 and Cl is -1 so which would i use to determine which is +3 or +1?


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Group 1 metal ions will always have a +1 oxidation state
Why does oxygen dissolve in water?


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Original post by Saywhatyoumean
Why does oxygen dissolve in water?


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It can form hygrogen bonds with the water as it is highly electronegative.

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Original post by Undisclosed 15
It can form hygrogen bonds with the water as it is highly electronegative.

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Thanks! :smile:


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Original post by Saywhatyoumean
Why does oxygen dissolve in water?


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Does it?
Original post by Undisclosed 15
It can form hygrogen bonds with the water as it is highly electronegative.

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Can it?
Original post by Undisclosed 15
It can form hygrogen bonds with the water as it is highly electronegative.

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But how can hydrogen bonds form?

There's only an O in the O2?


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