3. Thursday, Dec. 5 th : “A” Day Friday, Dec. 6 th : “B” Day Agenda  Homework Questions/Problems (pg. 405: #1-5)  Check lab write-ups  Lab discussion/safety items  Conduct lab: “Energy and Entropy: Phase Changes” Lab will be due next time… **What Would Life Be Like?” paper due next time!**

4. “Energy and Entropy: Phase Changes” Lab Discussion  Since sodium thiosulfate pentahydrate is a solid, you will melt it first (Part 1, steps #1-3). (no data collection)  Once you start cooling the liquid, you will be recording temperature readings every 15 seconds.  In Part 1, step #4, don’t forget to add 1 or 2 seed crystals of sodium thiosulfate pentahydrate to the test tube.  When you are finished, put your test tube into the rack on the back supply table and wash your hands.

5. “Energy and Entropy: Phase Changes” Safety Issues  Safety glasses and aprons – all the time!  Since we will be using bunsen burners, hair must be tied back.  Be careful with the burner flame and the glassware. Remember, hot glassware looks the same as cold glassware!  Be sure to wash your hands before leaving the lab area!

6. “Energy and Entropy: Phase Changes”  When you’re done in the lab, start working on the graph, analysis, conclusion, and extension questions with your lab partner…  Lab will be due next time…