Science 10 - We went over the homework assigned on the weekend and I collected assignments from the students. Students were given some time to fix their assignments if needed after we went over the homework. Moved on to polyatomic ions and how to write compound names and formulas with polyatomic ions. Expect a quiz in the near future on ionic compounds and multivalent ions.   Science 9 - Discussed the big bang theory in class. Students took some notes and watched a short video clip about how scientists currently think, based on the evidence they have, happened right after the big bang. Students were assigned individual work on determining the differences between a spacecraft and an aircraft. Test this Friday, October 22, on Chapters 15 & 16.