Tis the Season for Sweet-Tasting Chemistry!
Week 14 Resources/ Assets
Updated December 8, 2018
Please make sure you READ everything on this page or you will miss important details. I will archive past weeks Announcements pages for a limited time only under the Trimester 1 and 2 tabs, if you need to go back to a particular weeks information for any reason.
Week 13 in Review
We opened the week looking over Section 8.3 - Reactions in Aqueous Solution, specifically, balancing net ionic equations. As a class, we worked on Quiz #13, and whatever was not completed, you were to take home and complete. You are free to use your textbook to assist you in solving the remaining problems. Also, please make sure you refer to the Solubility chart that is on the quiz. This is the exact same chart that will be on your exam.
Upcoming Week 14
This coming Tuesday, we will finally perform Precipitation Reactions: Formation of Solids Lab (linked right). As you read through the lab in preparation for the class, think about what you will do. You will take solutions with dissolved ions in them - like Na+ and OH- for one; and Ca2+ and Cl- for the other - and mix them together in what will be double-replacement reactions. In this particular reaction the Ca2+ ions will bind tightly to the OH- ions, forming a solid in the solution (Ca[OH]2), and then by virtue of the solid's weight, it will precipitate, or fall out of the solution to the bottom of the test tube. Not all combinations of ions will form solids - this is what you will be documenting on Tuesday.
Please read ahead and note in Analysis Question #1, you will be asked to write the solid's formula name (if a solid formed, that is); and continue answering the rest of the questions under the Analysis section of the lab. You should know right now that the Na+ ions do not form a solid precipitate with any of the anions from any source; the solutions containing Na really only provide the binding anion for other cations such as Ag+, Pb2+, and Ca2+.
This lab will provide to you a lot of practice in writing the formulas of ionic compounds, and writing balanced chemical equations - which will assist you greatly on the last test before the Christmas Break.
If you have not already done so, please print out the articles and assignments at right, read them thoroughly before Tuesday, and be prepared to turn in the completed labs when you return from Christmas break.
You are all scheduled to take a test covering Chapters 7, and 8, only, due when you return from Christmas Break. I will make the test packet available this weekend, in the event your parents are anxious for you to complete sooner rather than later - so you can enjoy the holiday break. As confirmation that a parent did proctor this exam, I'll provide a line item for signature.
Finally, so that you may receive credit for the Chapter 8 Homework, I will provide an additional line item on the exam for your parents to sign, indicating that they did inspect your homework and found it completed to their satisfaction. I don't want to collect the chapter homework Tuesday, since you will need it to study for your exam.
Please do take advantage of the Tyler DeWitt videos linked right, and the screencast I did on Section 8.2 from your textbook!
To prepare for Tuesday's classes, please make sure you do the following by:
Tuesday's class - December 11th: