Qualification > Sciences
ALL CIE CHEMISTRY DOUBTS HERE !!
Arthur Bon Zavi:
--- Quote from: *JiNx* on September 19, 2010, 07:09:25 pm ---ohh yeaa too late NOT actually :P
hahaa
i gave my physics & maths A level (AS & A2) in june 2010
n now in june 2011 ill be giving chem Alevel and ict AS ;)
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Ohh!! Best Of luck with your subjects and keep posting the doubts right here!! :D
Twinkle Charms:
--- Quote from: Theonlyone on September 20, 2010, 01:29:16 pm ---Ohh!! Best Of luck with your subjects and keep posting the doubts right here!! :D
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thanks theonlyone =]
So can anyone suggest why the relative atomic mass of Martian oxygen is different from that of oxygen obtained from earth?
Deadly_king:
--- Quote from: *JiNx* on September 24, 2010, 08:02:48 pm ---thanks theonlyone =]
So can anyone suggest why the relative atomic mass of Martian oxygen is different from that of oxygen obtained from earth?
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--- Quote ---The analysis of a sample of Martian air collected by the Phoenix Lander shows that the ratio of oxygen and carbon dioxide isotopes present in the atmosphere of Mars is very similar to that of Earth. Due to Mars’ low gravity and lack of magnetic field, lighter isotopes are lost to space and so an older atmosphere will consist of mainly heavier isotopes.
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In other words the oxygen on Mars would consist mainly of O18 while on Earth our oxygen consist mainly of O16.
Hope it helps clear your mind about that :)
Twinkle Charms:
--- Quote from: Deadly_king on September 25, 2010, 05:47:48 am ---In other words the oxygen on Mars would consist mainly of O18 while on Earth our oxygen consist mainly of O16.
Hope it helps clear your mind about that :)
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oohhh thanks ;D
The first 4 ionisation energies of an element are 590, 1150, 4940 and 6480 KJ mol-1. Suggest the group in periodic table to which this element belongs. [I have the answer from the back of the text, buh dont understand it =\ so i want explanation please =] )
Deadly_king:
--- Quote from: Twinkle Charms on September 25, 2010, 03:06:35 pm ---oohhh thanks ;D
The first 4 ionisation energies of an element are 590, 1150, 4940 and 6480 KJ mol-1. Suggest the group in periodic table to which this element belongs. [I have the answer from the back of the text, buh dont understand it =\ so i want explanation please =] )
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From the given values, we can note a very significant rise (more than twice) from the second ionisation energies to the third ionisation energies. This suggest that there has been a change in orbitals(more precisely shell number) which proves that the element has two electrons in its outermost shell.
Therefore the element is in group 2.
Did you get me??
If not......let me know and i'll try to elaborate more :)
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