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Offline Aymen Ezazi

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Chemistry
« on: May 14, 2013, 10:42:31 am »
hey all.. i am new to this forum, and doing past papers so lots of doubts coming up!!
can anyone explain me question 5 in paper 1.. why the answer is B and not D?? the hydrogen bonds are broken in methane because it is broken down to carbon and hydrogen.. not in ammonia bcoz its just changing to gas..http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s06_qp_1.pdf .. this is the link to the paper!!
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Offline Suryaw1

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Re: Chemistry
« Reply #1 on: May 28, 2013, 05:57:51 pm »
Hydrogen bonds are only formed when hydrogen is bonded to very electronegative elements, such as N, O and F. In question no 5, only option B has hydrogen bonds. Therefore it also can be broken down.
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Offline NotAbod

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Re: Chemistry
« Reply #2 on: May 28, 2013, 06:02:31 pm »
Quote from: Suryaw1 on May 28, 2013, 05:57:51 pm
Hydrogen bonds are only formed when hydrogen is bonded to very electronegative elements, such as N, O and F. In question no 5, only option B has hydrogen bonds. Therefore it also can be broken down.
Indeed. This is correct.
Thanks for answering him :)
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