"how would the melting range of a pure organic material be changed if there was a tiny shard of broken glass inside the melting point capillary? "

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.

What are the 4 phases of matter in order of increasing engery content?

Which of the following would be an accurate picture of the earth during the summer time of the northern hemisphere?