11/10

This week, we learned many different concepts from Vapor Pressure to Lattice energy to Liquids and Solids. We also continued to learn about how the IMF forces affected these basic concepts and what other forces or bonds held these molecules together.

The first main concept we learned about was vapor pressure. Vapor pressure is the amount of gas of a compound that is in equilibrium with the liquid or solid. This means that if IMFs are weak in the compound, molecules can more easily break out of the liquid or even solid into the atmosphere. This concept of vapor pressure is used to explain why water evaporates when left out for a few hours. The link and images below give a better in-depth description of what vapor pressure is and what are some common trends that go along with it.

IMFs and Vapor Pressure in Depth

Later on in the week, we learned about Lattice energy in molecules. Lattice energy is the amount of energy required to completely separate a mole of a solid ionic compound into its gaseous state. The main things to know about Lattice energy is that it increases with the charge on ions and decreases with the size of these ions. Also, as Lattice energy goes up, so does the element's boiling point.

The last thing we learned about this week was about the conductivity of different compounds and their correlation with trends such as boiling point and melting point. We conducted a whole lab testing the conductivity of different substances and engaged in a rather large discussion over these concepts. We learned that testing the conductivity of a substance is really only testing the ability of the electrons in that substance to move. We worked with our table groups to complete the lab and settle any unresolved questions.

Overall, this week flew by pretty quickly. My participation this week hasn't been as great as it could be and I need to work to improve that in the upcoming weeks. I am quite nervous for the test on tuesday because I am not entirely sure about all of the concepts we will be tested on. I do not know the material very well and will need to study pretty hard tomorrow to get all of these concepts. The end of the tri is looming over us and I cannot be more excited!!!

11/4

This week, we learned all about intermolecular forces. We completed a few POGILs this week on Intermolecular forces and Water learning about the four different types of intermolecular forces while also learning what the difference between intramolecular and intermolecular forces were. During the week, we completed several lecture quizzes on each of the four different types of intermolecular forces. As the week came to a close, we began working on the Lecture 23 worksheet and were introduced to liquids and solids.

The first thing we learned about in this unit was the various types of intermolecular forces. We spent two days reviewing a POGIL and had multiple lecture quizzes on this subject because it is so important.  This POGIL first taught us the correlation between increasing molecular weight and increasing intermolecular forces with increasing boiling point of molecules. It also taught us the difference between intermolecular and intramolecular in that intra means within a molecule where inter is bonding two molecules together. The POGIL also introduced us to the 3 main types of intermolecular forces which are hydrogen bonding, dipole-dipole forces, and induced dipole-induced dipole or London Dispersion Forces. Links further explaining each of the forces further in depth are listed below.

Dipole-Dipole and London Dispersion Forces

Hydrogen Bonding

The strongest of the forces, Hydrogen bonding, was a huge focus in the lessons this week. We learned all about the different types of forces present in each molecule. The pictures below illustrate the strengths of the different forces, an example of some molecules with multiple charges, and a little explanation of what hydrogen bonds really are. As seen below, London Dispersion forces are found in every compound. However, dipole-dipole forces are only found when there is a dipole in the molecule whereas there must be and O, N, or F present next to the H atom for Hydrogen bonding to occur. Dipole-induced dipole forces are not very commonly found s we id not really address them this week.

The water POGIL helped us get a very good interpretation of what hydrogen bonds are, when, and where these hydrogen bonds occur. We spent only a few days working on it though before moving into liquids and solids which we started this weekend. We completed a lecture quiz on both liquids and solids on Sunday and I believe we will go much further in depth with that subject next week.

Overall, my participation this week was very good. I understand most of the concepts from this week pretty well besides the Dipole-Induced Dipole forces. Those were very confusing to me. I think I still need to work on memorizing the charges and their properties a little bit more. I am excited to see where we move on to next week!