lolwut, unit 3? Okay, then, usually this doesn't come up until unit 4.
1. Consider the formation of hydroiodic acid:
H2 + I2 <-----> 2HI
If you increase the volume, this will correspond to a decrease in pressure. Le Chatelier's principle predicts that a decrease in pressure will shift the equilibrium towards the size with more particles - however, both sides of the equilibrium have the same amount of particles, and so the position of the equilibrium is not expected to shift by increasing the volume. The same argument applies for decreasing the volume.
2. Erm, couple of things:
Those should be silver IONS. Silver itself is usually a solid, as with most metals. Also, this is not a dissociation reaction, it's a precipitation reaction.
Two processes that could increase the amount of silver ions removed:
1. Just add excess carbonate. Add so much carbonate so that all the silver ions have to react.
2. Assuming there is some kind of equilibrium there (because the last question was an equilibrium question), you could put it on heat to turn the water into steam, thus removing it. This will correspond to a decrease in the volume, which will cause a shift to the side with less particles - which is the forward reaction. (not recommend IRL because it actually increases solubility, so you'd have to wait for it to cool back down, but whatevs)
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