• We need your support!

    We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
    Click here to Donate Now (View Announcement)

AS Chemistry P2 Prep.

Messages
198
Reaction score
47
Points
28
mass spectroscopy-mass of each isotope of an element in it....
1 vaporisation
2 ionisation
3 deflection
4 detection
the mass spectrum shows relative abundance against ion charge
Determination of Ar from mass spectra
multiply each isotopic mass by its % abundance
add the figures
divide by 100
 
Messages
198
Reaction score
47
Points
28
avogadro constant-6.02x1o^23
moles=mass/RMM
to find mass of products in a chemical reaction:
1-mass of the reactants
2-molar mass of the reactants
3-balanced equation
 
Messages
251
Reaction score
54
Points
38
As-Salaamu 'Alaykum;

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s04_ms.pdf

They accepted both dehydration and elimination in question 4 part (c) in that MS.

But never trust examiners. >.> Just write both.
m/j 2009p22
Q5c
Thanks a lot both of you. but we can't write both so write dehydration for H2O and elimination for alkyl halides, as this can't be wrong in any case. Who knows the examiner!
 
Messages
198
Reaction score
47
Points
28
% by mass=atoms x no of moles of an element/molar mass of compound x100
 
Messages
224
Reaction score
183
Points
53
Not a good idea. Writing both implies you're confused which one. Write any one (preferably dehydration).

o.o;

Hmm... I guess.

Edit: Question; Summer/June 2004, question 3, part (d):

Paper: Click me!
Mark Scheme: No, click me!

Is it important to show the 'balloon'-shaped thing over ammonia for the lone pair that's drawn in the Mark Scheme? If so, why, because in the question they only asked for the shape and the bond angle...

Jazak Allah Khayr.
 
Messages
532
Reaction score
151
Points
53
ok ppl a humble request to all the user of the threads...wen ever u r posting any information...be very carefulll and 100% sure ...coz the students from all over the world will be accessing to this thread...
 
Top