2. Friday, Nov. 2 nd : “A” Day Monday, Nov. 5 th : “B” Day Agenda  Homework Questions/problems  Sec 10.4 Quiz: “Order and Spontaneity”  Lab Discussion/write-up: “Calorimetry and Hess’s Law”  Movie: “Heat”  Concept review work time… Lab next time: dress appropriately!

3. Sec. 10.4 review Pg. 367: #3-5, 7-11  Questions?  Problems?  Hand in

4. Sec 10.4 Quiz “Order and Spontaneity”  You can use your notes, your book, and a lab partner of your choice to complete the quiz… Good Luck!  Pick up a copy of the lab when you hand in your quiz and start reading it through…

5. “Calorimetry and Hess’s Law” Discussion  Remember, Hess’s Law states that we can find the enthalpy change for a reaction by adding up the enthalpy changes for the individual steps.  You will run 3 different reactions: 1.NaOH (s) + H 2 O (l) 2.NaOH (aq) + HCl (aq) 3.NaOH (s) + HCl (aq) **(The 1 st 2 reactions add up to give the 3 rd )**

6. “Calorimetry and Hess’s Law” Discussion  You will use the calorimetry equation q = mCΔT to calculate the heat released in each reaction.  You will then use stoichiometry and the calorimetry equation to calculate find out if the temperature did indeed get hot enough to burn the man.

7. “Calorimetry and Hess’s Law” Purpose  What is the purpose of this lab? The purpose of this lab is to measure the amount of heat released by mixing NaOH and HCl to find out if enough heat is released to raise the temperature high enough to cause a burn.

8. “Calorimetry and Hess’s Law” Materials  There are a few changes to the materials list: We will NOT be using the 3 items listed under “Optional Equipment” We will be using calorimeters, NOT plastic foam cups You will use a porcelain scoop instead of forceps when handling the NaOH. Changes to material list have already been made!

9. “Calorimetry and Hess’s Law” Procedure  The procedure for this lab is a little confusing because the original lab handout showed 2 different ways of running the lab.  Your procedure starts on the top of pg. 36 where it says “Advance Preparation”, steps #1 and #2.  The rest of page 36 is crossed out because you will be using the “Thermometer Procedure” that begins on pg. 39.

10. Lab Discussion: “Calorimetry and Hess’s Law”  There are 3 different reactions you will be running, all using hydrochloric acid (HCl) and sodium hydroxide (NaOH).  You do not have to wear gloves when handling the NaOH, but you must use the porcelain scoop to measure them. Do not touch the pellets!  Be sure to CLOSE the NaOH container when done measuring it because it is hygroscopic, meaning it will absorb moisture from the air and gain mass.

11. Lab Discussion: “Calorimetry and Hess’s Law”  When you add the chemicals to the calorimeter, make sure you add them to the beaker and NOT directly into the metal calorimeter container.  These chemicals are corrosive and will pit the metal calorimeters.  The actual laboratory part of this lab is not difficult, it’s the calculations that will take some time.  We will go through the calculations together back in the classroom.

12. Lab Write-Up: “Calorimetry and Hess’s Law”  Be sure to update your table of contents with this lab.  You have the rest of the period to complete the lab write-up with your lab partner: 1.Title 2.Purpose 3.Hypothesis 4.Materials 5.Procedure 6.Reflection Statement

13. Movie: “Heat”  You DO NOT have to take notes on the movie, but I do expect you to pay attention!