Comments on: O Level Chemistry: Common Errors in Energy Changes (Endothermic / Exothermic) http://www.simplechemconcepts.com/o-level-chemistry-common-errors-in-energy-changes-endothermic-exothermic-2/ O-Level Chemistry Made Easy Sat, 14 Jan 2012 03:43:17 +0000 hourly 1 http://wordpress.org/?v=3.0.4 By: Gabriel http://www.simplechemconcepts.com/o-level-chemistry-common-errors-in-energy-changes-endothermic-exothermic-2/comment-page-1/#comment-7079 Gabriel Thu, 07 Oct 2010 14:12:33 +0000 http://www.simplechemconcepts.com/?p=2861#comment-7079 I suppose there's no formation of bonds? It's just gaining of electrons. I suppose there’s no formation of bonds? It’s just gaining of electrons.

]]> By: Sherman http://www.simplechemconcepts.com/o-level-chemistry-common-errors-in-energy-changes-endothermic-exothermic-2/comment-page-1/#comment-5423 Sherman Thu, 22 Apr 2010 14:12:30 +0000 http://www.simplechemconcepts.com/?p=2861#comment-5423 Reduction of silver ions to silver atoms in photography could be a redox reaction? Thus while gaining electrons is exothermic, the anion that the silver cation is bound to will lose electrons, giving an endothermic 'side' to the reaction. Since silver has a comparatively larger atomic size, the outer electrons are further away from the attractive force of the nucleus thus lesser energy is released when the silver ion gains an electron. Since overall change in enthalpy = Endothermic + Exothermic, since the negative exothermic value is relatively smaller, and the endothermic relatively larger, the overall reaction tends to be exothermic. Not sure if I'm right though... haha Reduction of silver ions to silver atoms in photography could be a redox reaction? Thus while gaining electrons is exothermic, the anion that the silver cation is bound to will lose electrons, giving an endothermic ‘side’ to the reaction.

Since silver has a comparatively larger atomic size, the outer electrons are further away from the attractive force of the nucleus thus lesser energy is released when the silver ion gains an electron.

Since overall change in enthalpy = Endothermic + Exothermic, since the negative exothermic value is relatively smaller, and the endothermic relatively larger, the overall reaction tends to be exothermic.

Not sure if I’m right though… haha

]]> By: Harry http://www.simplechemconcepts.com/o-level-chemistry-common-errors-in-energy-changes-endothermic-exothermic-2/comment-page-1/#comment-4996 Harry Fri, 16 Apr 2010 14:17:53 +0000 http://www.simplechemconcepts.com/?p=2861#comment-4996 Why is B the answer anyway. Isnt gaining electron bond forming = exothermic? Why is B the answer anyway. Isnt gaining electron bond forming = exothermic?

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