Wednesday
July 23, 2014

Homework Help: Chemistry

Posted by Raj on Tuesday, November 20, 2007 at 10:01pm.

When given a chemical reaction, how would I know whether a reaction is endo or exothermic and whether work is done on the system or by the system. Without using any calculations.

So I have a couple reactions which I have to use chemical reasoning to to determine.

2 Cl(g) --> Cl2(g)
H2O(l) --> H2O(g)
2 H2(g) + O2(g) --> 2 H2O(l)
2 Li(s) + H2O(l) --> 2 LiOH(aq) + H2(g)
3 NaN3(s) --> Na3N(s) + 4 N2(g)

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