Qualification > Queries
ANY DOUBTS HERE!!!
Amr Fouad:
--- Quote from: ruby92 on April 11, 2010, 12:57:07 pm ---could u explain this in more detain please ??? ???
--- End quote ---
alright..here is the deal..chlorine is a diatomic element that consists of 2 atoms paired up, right?
there are 2 isotopes of chlorine, 35 and 37..therefore, it is possible to have only 3 combinations of these 2 isotopes..
1) a diatomic molecule with one 35 Cl atom, and 1 35 Cl atom
2) a diatomic molecule with one 35 Cl atom, and 1 37 Cl atom
3) a diatomic molecule with one 37 Cl atom, and one 37 Cl atom
got that?
nid404:
--- Quote from: ruby92 on April 11, 2010, 12:57:07 pm ---could u explain this in more detain please ??? ???
--- End quote ---
Chlorine has two isotopes, 35Cl and 37Cl, in the approximate ratio of 3 atoms of 35Cl to 1 atom of 37Cl. You might suppose that the mass spectrum would look like this:
The problem is that chlorine consists of molecules, not individual atoms. When chlorine is passed into the ionisation chamber, an electron is knocked off the molecule to give a molecular ion, Cl2+. These ions won't be particularly stable, and some will fall apart to give a chlorine atom and a Cl+ ion. The term for this is fragmentation.
If the Cl atom formed isn't then ionised in the ionisation chamber, it simply gets lost in the machine - neither accelerated nor deflected.
The Cl+ ions will pass through the machine and will give lines at 35 and 37, depending on the isotope and you would get exactly the pattern in the last diagram. The problem is that you will also record lines for the unfragmented Cl2+ ions.
Think about the possible combinations of chlorine-35 and chlorine-37 atoms in a Cl2+ ion.
Both atoms could be 35Cl, both atoms could be 37Cl, or you could have one of each sort. That would give you total masses of the Cl2+ ion of:
35 + 35 = 70
35 + 37 = 72
37 + 37 = 74
That means that you would get a set of lines in the m/z = 70 region looking like this:
The overall mass spectrum looks like this:
yaa?
Metallicnak:
Sorry to break up all the Chem discussions guys :P but I need to get some physics doubts straight here.
1) Does a material vibrates at its maximum amplitude when its at its fundamental frequency compared to its other modes of vibration. If so then isnt fundamental frequency of a material the same thing as the materials natural frequency.
2) Can someone tell me the differences between a single slit interference and double slit and if light can produce an interference pattern through a single slit, when one of the double slits are covered sholdnt an interference pattern still be noticed?
3) Explanation of doppler effect when the observer is moving towards the source of sound.
Guys if u could speed up on ur replys i would be grateful hve a mock exam tommorow :-\
Much help appreciated! :)
Sue T:
thank u all
if any1 would kindly check the attached questions (just 2 more of paper 1) - i've been carrying them around 4 more than a month now - no 1 seems 2 no how 2 do em..
sweetie:
cud sum1 plz xplain Q10 of this paper????????
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