1. Warm Up 1.What is the formula for calcium chloride? 2.How many bonds does carbon form? 3.What determines the ratio elements combine in?

2. Announcements Unit 8B test next Friday School on Monday Stay on top of grades: retake or makeup units 6 + 7

3. Take 1

4. Review

5. Unit 8A Test- Reactions Talk once = warning; Talk twice = zero If you have a question, raise your hand silently No notes Use a #2 pencil + Periodic Table Do NOT write on the test When finished: –write name and VERSION # on scantron –put scantron in your period’s bin –Put your test, pencil, and calculator on the front table

6. Number of bonds SAME number as charge number What’s the pattern again?

7. What about # of bonds in a Lewis dot structure? Each line represents one bond… o=x=o How many bonds?

8. So what determines how bonding works? Number of valence ELECTRONS!!!

9. What’s a period? What’s a family? Period - row (across) Family/group – column (up and down)

10. Practice! If oxygen forms 1 bond with something, how many bonds does that element form? So what column is it in? If oxygen forms 2 bonds with something, how many bonds does that element form? So what column is it in?

11. Remastery quiz Work silently and alone for full credit

12. Enjoy your weekend! Get excited for Unit 8B- More Reactions Top ten- how’d we do? Prize Draw School on MONDAY