Week 29 Announcements
Week 29 Resources/ Assets
Updated April 18, 2019
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 their respective Trimesters 1, 2 and 3 tabs, if you need to go back to a particular weeks information for any reason.
Week 28 in Review
This past week, we completed a discussion on Chapter 17 - Water and Aqueous Systems; there will be no homework problems for this chapter. I linked the PowerPoint slides in pdf format at right for your review. We then started Chapter 18 - Solutions, and got through Sections 18.1 - Properties of Solutions, and 18.2 - Concentrations of Solutions.
The main concepts in Section 18.1 had to do with the properties of solutions, of greatest importance is a substances solubility. Substances have varying solubilities based upon temperature; for solutes dissolved in liquid solvents, they are generally more soluble under higher temperatures. By contrast, gas solutes (seen in carbonation) are less soluble as temperatures get higher (think about how flat a Diet Coke gets when it is warm).
In Section 18.2, you hopefully learned that we can measure the concentration of solutions by molarity (M) which is defined as moles solute/ liter of solution. We also briefly touched on the idea of how to perform chemical dilutions. If I have in my basement lab a solution of 12M HCl, and want to make 250 mL of a 0.1 M HCl solution, would you know how to do this? You would use the equation:
M1V1 = M2V2
Where M1 is the molarity of your stock solution (12M), V1 is the volume of that solution you would add to distilled water (the variable we are solving for), M2 is the molarity of your wanted solution (0.1M), and V2 is its volume (0.250 L).
In solving this problem, we solve for V2, which is 2.1 mL, thus we would state, "to make 250 mL of a 0.1 M HCl solution from 12 M HCl stock, add enough distilled water to 2.1 mL of 12 M HCl to make 250 mL. "
Upcoming Week 29
When you come to class next Tuesday, we will perform the Chemical Kinetics: A Clock Reaction, laboratory. Please print this out, read thoroughly, and bring with you to class on Tuesday. We will first discuss the concept of chemical kinetics, and then carry out the laboratory.
This coming Tuesday will be the last day for our chemistry class, since the last day of Veritas (April 30th) I will be at the PEP Milford campus watching my son David's senior capstone speech. Young Mr. Hennecke has graciously offered to proctor the class in a game of Kahoot!
Your final exam for the course will be due Wednesday evening, May 1st, 11:59 pm, and will cover what we discussed in Chapter 17, Chapter 18 (Sections 18.1, 18.2), and whatever we cover in Chapter 19.
Check-off List of Things to Do:
So that you are properly prepared for classes next week, please make sure you do the following by:
Tuesday, April 23th:
The very last assignment you will turn in to me for grading will be your final exam covering Chapters 17, 18 (Sections 18.1, 18.2), and parts of Chapter 19 as covered in class and laboratory. I will mail this exam out by Friday, April 26th, and the Answer Sheet will not be due until Wednesday, May 1st, 11:59 pm.
You will also need to get a parent signature on the Answer Sheet indicating that you completed the Chapter 18 (Sections 18.1, 18.2) and 19 homework (Section 19.1 only), along with the Chemical Kinetics laboratory.