Chemistry as level help

[slisjunknown]

Assalamu alaikum and hi there everyone!
I just needed to noe if anyone has got notes for the first 3 chapters in as level chemistry [according to 2015 syllabus]. If so, pls update it here; I have a major problem in stoichiometry.
Thnaks alot in advance

 

[Alya Usman]

I dont have any notes, someone else will hopefully give them to you. But just a word of advice, stoichiometry is the same in AS level as it was in O'levels. And its basic. You need to get it nailed. Use O'levels books if you have to. I recommend Chemistry Calculations.
The only 'kind of' new concept is of finding the empirical formula by combustion analysis, which is very simple.

 

[Jennifer4678]

Hey ! Can someone please explain how to identify the shape and bond angles for hydrazine N2H4 ? Thanks

 

[♣♠ Magnanimous ♣♠]

just check this presentation from my old acc ----> https://www.xtremepapers.com/community/threads/some-presentations-on-chemistry-of-as-level.31602/

Assalamu alaikum and hi there everyone!
I just needed to noe if anyone has got notes for the first 3 chapters in as level chemistry [according to 2015 syllabus]. If so, pls update it here; I have a major problem in stoichiometry.
Thnaks alot in advance

 

[♣♠ Magnanimous ♣♠]

Hey ! Can someone please explain how to identify the shape and bond angles for hydrazine N2H4 ? Thanks

I am getting Square pyramidal due to it is AB5L type of molecule where B is for bond pairs and L is for lone pairs
But still confused! ZaqZainab Suchal Riaz help please

 

[Suchal Riaz]

I am getting Square pyramidal due to it is AB5L type of molecule where B is for bond pairs and L is for lone pairs
But still confused! ZaqZainab Suchal Riaz help please

can u see that for yourself now?

the shape is triangular pyramid about each N.

 

[♣♠ Magnanimous ♣♠]

can u see that for yourself now?
View attachment 47624
the shape is triangular pyramid about each N.

okay
Jennifer4678