Na(s) + Cl2(g) → NaCl(s) Is this a chemical reaction, or a physical reaction ? Explain your
reasoning

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 is the independent variable in this investigation? mass volume sample number substance density

No copying 15 pts how does a free-body diagram tell you about the net force on an object?