3. Friday, Nov. 16 th : “A” Day Monday, Nov. 19 th : “B” Day Agenda  Collect Review Worksheets  Collect completed KWL  Collect Concept Review  Chapter 3 Test  Lab Discussion and write-up We will be in the lab next time…  Homework: Finish popcorn lab write-up Work on mole project – due next time!

4. Ch. 3 Test “Atoms and Moles”  You may use your notes, the electron filling chart, a period table, a calculator, etc.  You may NOT use your book, homework or any quizzes… GOOD LUCK!  When you’re done with the test, pick up a lab handout and start reading it through…

5. Lab: “Conservation of Mass: Percentage of Water in Popcorn”  For this lab, you may choose your own lab partner.

6. Lab: “Conservation of Mass: Percentage of Water in Popcorn”  Make sure to update your table of contents with this lab before starting the lab write-up.  Remember the steps of the lab write-up: 1.Title 2.Purpose 3.Hypothesis 4.Materials 5.Procedure

7. Lab: “Conservation of Mass: Percentage of Water in Popcorn” Purpose  Popcorn pops when the internal water inside the kernel gets above 100°C, turns to a gas and rapidly expands.  Different types of popcorn have different amounts of internal water and will pop differently.  The purpose of this lab is to test 3 different types of popcorn to determine the percentage water contained in each.

8. Lab: “Conservation of Mass: Percentage of Water in Popcorn” Hypothesis  Which type of popcorn (beta, gamma or delta) do you think has the highest percentage of water? OR  Do you think there will be no difference in the water content of the three different types of popcorn?

9. Lab: “Conservation of Mass: Percentage of Water in Popcorn” Materials  You will need to actually pop the popcorn to determine the percentage of water it contains, so what kind of lab equipment will you need?  What type of container will you use to pop the popcorn?  You will use only one 250 mL beaker for all three samples of popcorn. The beaker will need to be cleaned out after each test because they get pretty nasty!

10.  How will you keep the popcorn from flying out of the container while it’s popping?  If you use foil, be sure to poke holes in the foil to let the steam escape.  What will you use to pick up the hot beaker?  Beaker tongs!  Should you put the hot beaker on the lab table?  No, put it on another piece of wire gauze to cool. Lab: “Conservation of Mass: Percentage of Water in Popcorn” Materials

11.  How many kernels should you pop at once?  20 kernels of each type of popcorn work best for each test.  You will need to add a dropper of vegetable oil to the beaker before you pop the popcorn.  Remember, when any type of food is brought into the lab, it becomes a chemical and CAN NOT be eaten! (It will probably be burned anyway!) Lab: “Conservation of Mass: Percentage of Water in Popcorn” Materials

12. Popcorn Lab Write-up  You have the rest of the period to work with your lab partner on the lab write-up: 1.Title 2.Purpose 3.Hypothesis 4.Materials To save time, I typed up 5.Procedure the materials/procedure so you don’t have to…

13. Popcorn Lab Data Table  This is the data table that you will complete: Technique Beta Technique Gamma Technique Delta Mass of 20 kernels (g) Mass of Beaker + oil + 20 kernels (before popping) (g) Mass of Beaker + oil + 20 kernels (after popping) (g) Mass of water in 20 kernels (g) % water in popcorn

14. Homework  Finish popcorn lab write-up  Finish mole project – due next time! Popcorn lab next time: be sure to wear proper footwear! Good Luck this weekend to musicians at the IMEA festival in DeKalb!