3. Friday, Oct. 4 th : “A” Day Monday, Oct. 7 th : “B” Day Agenda  Homework Questions/Collect  Quiz review  Section 9.2 Mini-Quiz  Lab write-up: “Stoichiometry and Gravimetric Analysis”  Concept Review work time  Homework: finish lab write-up Lab next time… Wear proper footwear!

4. Homework Questions  Sec. 9.2 review, pg. 319: #1-10

5. Practice Determine the limiting reactant and the percentage yield for the following: N 2 + 3 H 2 2 NH 3 14.0 g N 2 react with 3.15 g H 2 to give an actual yield of 14.5 g NH 3. N 2 is the limiting reactant. Theoretical yield = 17.0 g NH 3. Percentage yield = 85.3%

6. Sec. 9.2 Mini-Quiz  When you finish the quiz, hand it in, pick up the lab: “Stoichiometry and Gravimetric Analysis” and start reading it through…

7. Lab: “Stoichiometry and Gravimetric Analysis”  Be sure to update your table of contents with this lab….

8. Lab: “Stoichiometry and Gravimetric Analysis”  In this lab, you will be reacting an unknown amount of sodium carbonate, Na 2 CO 3, with an excess of strontium chloride, SrCl 2, to produce aqueous sodium chloride, NaCl, and solid strontium carbonate, SrCO 3.  You will use gravity filtration to separate the precipitate that forms.  After washing the precipitate, the solid will be dried overnight in the drying oven.

9. Lab: “Stoichiometry and Gravimetric Analysis”  After the precipitate is dry, you will use stoichiometry to calculate: the moles of product formed the moles and mass of Na 2 CO 3 that must have been in the original solution the amount of Na 2 CO 3 in the 575 L vat on the factory floor

10. Lab: “Stoichiometry and Gravimetric Analysis”  Your lab partner for this lab will be……

11. Lab: “Stoichiometry and Gravimetric Analysis” Changes to Materials List and Procedure I made changes before copying the lab so you don’t have to change anything… You’re welcome!

12. Lab Write-Up: “Stoichiometry and Gravimetric Analysis”  You have the remaining time to work on the lab write-up. 1.Title 2.Purpose 3.Hypothesis 4.Materials 5.Procedure 6.Reflection Statement

13. Concept Review Work Time  If you finish the lab write-up, use the remaining time to work on the concept review: Ch. 9 Test/Concept Review due: Thursday, Oct. 17 th : Friday, Oct. 18 th We’ll be in the lab next time….be sure to wear proper attire!