Chemistry 201 students took their first quiz, covered material in Chapter Five: the mole, grams to moles and moles to grams conversions, percent by mass, empirical formula, balancing equations, and carried out a laboratory on qualitative analysis. It was a very busy day.
Some folks still didn’t have laboratory notebooks. Monday was the last time that any stamps will be given outside the notebook. Notebooks are required everyday – not just for laboratories but also for demonstrations.
Some folks came to laboratory with no evidence of any preparation – i.e. the notebook was blank. This leads to poor laboratory work. Please come prepared. Read laboratory instructions ahead of time – write title, date and materials into the lab notebook and write a brief outline of the procedure.
One white precipitate made in laboratory was barium sulfate. Read about its use in the medical field.