What is cement and who invented it?

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.

Consider the elements bromine and chlorine; which elements has a larger ionic radius ?

What is the indicator of the number of ions in solution? the amount of conductivity the amount of precipitate the amount of solute added