According to how the other half lives, who was to blame for the lack of fresh air in buildings in the slums?

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.

The ph of carrots are 5.0 how it is classified a.acidic b.basic c.indicator d.neutral

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?