Links to download Zoom Lab Videos and PDF files
- Lecture Date: Monday, January 24, 2022
Introduction to the laboratory class. An overview of calculators and mathematical problem solving. The worksheet that was presented is titled Math Review for Chem 3 and can be downloaded here.
- Lecture Date: Monday, January 31, 2022
Today is a monster lecture. This is one of the single most important lectures of the entire semester - Measurement and Significant Figures. Significant figures are used throughout the entire Chem 3, Chem 1A and Chem 1B curriculum. They are traditionally the place that students consistently loose points and can easily make the difference between an A and a B in the course. Enough said. This is important.
- Lecture Date: Monday, February 7, 2022
This is another significant lecture. Today we take on the topic of dimensional analysis. Dimensional analysis is a system for solving many problems common to chemistry. In this lecture we try to break the system down into the following components: parsing the problem, building road maps, constructing the calculation, performing the calculation, applying significant figures. Multiple examples are presented. We also hit temperature conversions, conversions using percentages, and conversions involving squares and cubes.
- Lecture Date: Monday, February 14, 2022
Given the upcoming test on this Wednesday we took the first hour of the class and used if for review for some of the more recent topics in the lecture course. We looked at isotopes in more detail. We described where isotopes come from, what makes them different, and they symbols used to differentiate the different isotopes (nuclide symboles). From there we worked our way towards calculating the average atomic mass given the mass and isotopic relative abundance of each of the isotopes in a given family. Once we understood the average atomic mass in atomic mass units, we showed how this number is also the average molar mass or average mass in grams of one mole of material. We defined the mole and showed its connection to the gram equivalent of atomic mass units. This equivalence between the mole and the inverse of the mass of an AMU in grams, is the reason that the number on the bottom of the periodic table element has two units - amu/atom and grams/mole of atoms.
Now we start to get to todays exercise - stoichiometry - or mass to mole conversions. Here we look at the general road map for stoichiometry. This one road map will be consistent from here on out. We will add new roads into and out of it, but the main structure remains consistent throughout all chemistry. This map will guide you through Chem 1A and Chem 1B as well as your current Chem 3 course. We showed numerous example calculations spanning from simple mass to atom conversions, to calculating molar mass of compounds, and mass to molecule conversions. Lots to digest in this lecture.
- Lecture Date: Monday, February 28, 2022
Because our lab lecture was in person there was no recording or lecture notes to post. However, I have old lectures from 2021 that cover the same subject of nomenclature. These lectures are being provided for you to use as review if you need help with nomenclature. The two lectures are from 6/30/21 and 7/1/21.
First lecture for Nomenclature
Second lecture for Nomenclature
- Lecture Date: Monday, March 7, 2022
Because our lab lecture was in person there was no recording or lecture notes to post. However, I have old lectures from 2021 that cover the same subject of Lewis Structures. These lectures are being provided for you to use as review if you need help with Lewis Structures. The two lectures are from 7/6/21 and 7/7/21.
First lecture for starts with introduction to covalent bonds and electronegativity. From there it launches pretty quickly into Lewis Structures.
The second lecture here picks up with formal charge. We move into the second system of writing Lewis Structures by using common bonding patterns. Finally we take a look at structures that have multiple centers.
- Lecture Date: Monday, March 14, 2022
This lecture on VESPR Theory is from July 8, 2021 and follows directly from the two lectures on Lewis Structures. VSEPR Theory stands for Valence Shell Electron Pair Repulsion Theory. It is a very simple system used to predict the 3-D shape of a molecule from it's Lewis Structure.
- Lecture Date: Monday, March 28, 2022
These lectures cover the Solubility Lab. For support lectures I am supplying two lectures from the summer of 2021 that covered this same experiment. These lectures go into slightly more detail because the course was entirely virtual and all we could do was to explain the experiment. These should be very helpful in completing the questions of the experiment that we will do on the 28th.
First lecture covers an explanation of double displacement reactions and how to write the chemical equations.
The second lecture explains the experiment in detail and covers experimental observations and data workup.
- Lecture Date: Monday, April 4, 2022
These lectures cover the chemical unknowns lab that follows the solubility lab. For support lectures I am supplying two lectures from the summer of 2021 that covered this same experiment. Even if you finished the unknowns lab these lectures may be helpful for review, as we will see unknowns once more in the lab final for the class!
Lecture starts with a quick review of the solubility lab, but then quickly transitions into explanation of the unknowns lab.
This lecture starts with a question about stoichiometry, but also moves quickly back to the unknowns lab expanding on the ideas presented in the last video.
- Lecture Date: Monday, April 11, 2022
This lecture supports the Activity Series lab that was performed on April 11. This lecture is from April 2020 and gives all the information required to complete the Activity Series Lab.
- Lecture Date: Monday, April 18, 2022
This lecture supports the Molar Mass of a Gas lab that was conducted in person on April 18. This lecture is from April 28, 2020 and gives all the information required to complete the Molar Mass of a Gas lab. In addition, this lab starts with an explanation of the derivation of PV = nRT which may also be helpful to review.
- Lecture Date: Monday, April 25, 2022
This lecture supports the Acid-Base Titration lab that was conducted in person on April 25. This lecture is from May 5, 2020 and gives all the information required to complete the Acid-Base Titration lab.