Qualification > Sciences
ALL CIE CHEMISTRY DOUBTS HERE !!
Dania:
Can someone please help and explain this question for me?
Refer to the attachment.
Thanks in advance.
Deadly_king:
--- Quote from: Dania on October 29, 2010, 04:37:02 pm ---Can someone please help and explain this question for me?
Refer to the attachment.
Thanks in advance.
--- End quote ---
The diagram represents a mass spectrum for HCl.
NOTE : Only positive ions produce peaks in a mass spectrum since the substance is initially bombarded with electrons such that it loses one electron from a shared pair or a lone pair due to collision.
Hence for part 1 => 35Cl+
Second answer is 1H37Cl+
As for the third part, we must use the relative abundance of the two isotopes and multiply them by the Ar of the respective isotope. Then the sum of these two values is divided by the total amount of substance, in terms of abundance.
Relative atomic mass of Cl = (75(35) + 25(37))/(75 + 25) = 35.5
Just showing the above equation should be enough to score all the marks ;)
Dania:
What would I get if I had to react these 2 organic compounds?
Please explain any substitutions and/or additions.
Thanks in advance.
Deadly_king:
--- Quote from: Dania on October 30, 2010, 05:57:57 pm ---What would I get if I had to react these 2 organic compounds?
Please explain any substitutions and/or additions.
Thanks in advance.
--- End quote ---
That may depend on the conditions.
But the most appropriate reaction might be between the hydroxyl group of Y to the carboxylic group of Z to form an ester.
An alcohol reacts with a carboxylic acid to give an ester and water. Therefore it will be a condensation reaction whereby the H from alcohol and the OH from carboxylic acid combine to form water while the remaining compound joins together to give an ester. ;)
$!$RatJumper$!$:
--- Quote from: Dania on October 30, 2010, 05:57:57 pm ---What would I get if I had to react these 2 organic compounds?
Please explain any substitutions and/or additions.
Thanks in advance.
--- End quote ---
Thats right, it would form an ester and water for sure
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