November 26, 2015

Homework Help: Chemistry

Posted by victor on Sunday, November 22, 2009 at 7:14pm.

Label each of the following reactions as exothermic or endothermic ("exo" or "endo"), and according to whether work is done on or by the system, or no work is done at all ("on", "by" or "none")? Note that no "endo-on" cases appear here, as these are always thermodynamically unfavourable. There is no need to do any calculation, use chemical arguments to predict the sign of the enthalpy change.
Matching pairs
N2(l) --> N2(g)

Cl2(aq) + 2 KBr(aq) --> 2 KCl(aq) + Br2(aq)

Zn(s) + 2HCl(aq) --> ZnCl2(aq) + H2(g)

NH3(g) + HCl(g) --> NH4Cl(s)

S(s) + 3/2 O2(g) --> SO3(g)

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