Here is another problem I had with Le Chatelier's principle:
"How would these equilibria be affected by increasing the temperature?
a) 4NH3 + 5O2 4NO + 6H2O + heat
b) heat + NaCl Na+ + Cl-"
I don't understand what they mean when they say it shifts according to the direction heat is used up, or how it depends on whether or not the reaction is exo- or endothermic, or how to tell which it is.
If that makes sense.