Qualification > Sciences
Urgent As Chemistry Questions!!!
mousa:
those are for cie As chemistry paper one...
Q2 june 2006
Q5 nov 2004
Q2 june 2003
your help will be much appreciated :)
MaNi_DaDuDe:
--- Quote from: mousa on November 26, 2009, 08:20:56 am ---those are for cie As chemistry paper one...
Q2 june 2006
Q5 nov 2004
Q2 june 2003
your help will be much appreciated :)
--- End quote ---
- 2 A sample of chlorine containing isotopes of mass numbers 35 and 37 was analysed in a
mass-spectrometer.
How many peaks corresponding to +2 Cl were recorded?
A 2 B 3 C 4 D 5
B - is the answer. I have no clue why.
5 An atom has eight electrons.
Which diagram shows the electronic configuration of this atom in its lowest energy state?
B - is the answer. Well that's how you would put the electrons in the shells - that's the sequence. Plus, the paired electron in the p sub-shell makes it unstable; thus the energy needed to remove it is less as there is repulsion by the other electron in the subshell. (I think - I would have put B, anyway.)
How many moles of hydrogen are required to convert one mole of glyceryl trieleostearate into the
soft margarine?
A 4 B 5 C 6 D 9
The answer is B - I am not sure. I think you make a balanced equation and that's how you get it.
Sorry I wasn't much of help; I'm just a little hungry and confused right now. :(
pz
123:
--- Quote from: MaNi_DaDuDe on November 26, 2009, 01:17:10 pm ---..........
How many moles of hydrogen are required to convert one mole of glyceryl trieleostearate into the
soft margarine?
A 4 B 5 C 6 D 9
The answer is B - I am not sure. I think you make a balanced equation and that's how you get it.
Sorry I wasn't much of help; I'm just a little hungry and confused right now. :(
pz
--- End quote ---
Lol.."hungry"! :D
About the question... just count up the H atoms in the given formula. And count the H atoms in the formulas which they said goes in 1 chain & the other one thats in 2chains.Find difference of no. of H atoms. That should give 5 moles of H atoms. I guess in hydrogenation H2 is used but thats in H molecules. They have just said moles of Hydrogen....so assume that its in atoms..
mousa:
Thanks alot guys...any more responses?? ::)
MaNi_DaDuDe:
--- Quote from: 123 on November 26, 2009, 03:40:52 pm ---Lol.."hungry"! :D
About the question... just count up the H atoms in the given formula. And count the H atoms in the formulas which they said goes in 1 chain & the other one thats in 2chains.Find difference of no. of H atoms. That should give 5 moles of H atoms. I guess in hydrogenation H2 is used but thats in H molecules. They have just said moles of Hydrogen....so assume that its in atoms..
--- End quote ---
Yeah I was fasting.. :(
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