help ME!!! exoterm and endoterm reaction...

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St_indhiez
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Joined: Fri Sep 21, 2007 9:38 pm

help ME!!! exoterm and endoterm reaction...

Post by St_indhiez »

please help me to answer this question...

why an exoterm reaction is usually spontaneous reaction?? not like an endoterm one...

I'm begging U... hahaha
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ewhite11
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Joined: Mon Oct 15, 2007 2:44 pm

Post by ewhite11 »

my notes say that exo- is spontaneous b/c (in essence) energy is released without the help of an outside force, in an endo- energy is absorbed with and always needs the help of an outside force...hope that helps, if it makes any sense :?
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paully
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Post by paully »

an endothermic reaction requires an external source to trigger the reaction eg boiling water and an exothermic reaction gives off heat

eg 2HCl + 2Zn = 2ZnCl + H2 + heat you should have noticed your solution heating up as an any acid metal reaction takes place
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