Global temperatures increase, so more permafrost melts, so more methane is released, so global temperatures increase. WHY IS THIS AN EXAMPLE OF A POSITIVE FEEDBACK LOOP?

Does anyone know a lot about how to: - calculate mass of magnesium metal - calculate the actual yield of magnesium oxide - calculate the theoretical yield of mgo - calculate the percent yield of mgo - determine the percent yield of mgo - determine the average percent yield of mgo i had to do an online lab and its asking these questions but i have no idea where to start or how to be able to find these things. i can post the chart of the data from the lab or if you can tell me exactly how i can find each.

If a reactant was removed, did the new equilibrium system shift to make more reactants or more products?

How would the number of moles (n) of o2 change if the atmospheric pressure doubled but all other variables stayed the same