Reversible equilibrium:

what would the effect be by adding hydrogen gas to:
3Fe(s)+4H20(i)<==>Fe3O4(s)+4H2(g)

and...

effect of adding chlorine gas to:
P4(s)+6Cl2(g)<===>4PCl3(i)

3 answers

ah equilibrium, how annoying thou art...

since adding to either side of an equilibrium equation causes a dramatic increase to the opposite side, adding more H2 [a product] would increase the other side of the reaction, leaving you with more reactant.

the same principle applies to adding chlorine [a reactant] and would give you more product
Dude Cody, your right it is annoying!
have you had to solve the problems where you add something that reacts with both reactant and product but at a different rate? i printed off a second copy just to watch it burn when i was done.