In the past week, we finished learning about bonds (since the test is next tuesday or monday). We learned about the properties of solids and liquids determined by the intermolecular forces and the structure; the role of bonding in vapor; and Lattice energy.
Solids and Liquids are both determined by the type molecules it has and the intermolecular bonding. Solids can be a Covalent network solid, Molecular solid, and and metallic solid. Covalent network solid is when the molecules are covalently bonded to each to each other to form a strong and hard to break bond. Molecular solids are covalent molecules that are held with london dispersion forces, thus, they are not very strong. Metallic solids are when the molecules split so that the cations are surrounded by a “sea” of anions. Liquids are very different from solids. Liquids are when molecules spread out instead of being in a clump. Their viscosity is determined by the intermolecular forces: the greater the intermolecular force, the greater the viscosity.
Vapor pressure is the pressure the vapor of a substance exerts. The vapor is from the molecules that can “fall out” of the liquid because the molecules are just moving around randomly. Vapor pressure and boiling point are inversely related.
Lattice energy is about the energy to separate the ions in ionic bonds. The energy depends on the charge and size of the ions. The greater the charge is away from 0 and the smaller the ion is, the greater the lattice energy is. This makes sense because bigger charges and smaller ions means more attraction.
All these ideas add up to form a better knowledge about intermolecular bonding, or the bonding/ attractive forces between molecules. They tell the main ideas of compounds: the melting points, the boiling points, the strength, and the structure.
These experiments were heavily enforced by class activities like pogils, whiteboarding, and discussions. I enjoyed working with my group because they helped me alot. I think asking questions and getting them answered helped me the most.
I would say my participation was a 9/10 because I actively asked questions and worked well with my group. We had very nice discussions that helped greatly. However, I my understanding is about a 7/10 still. I am not too sure about where the molecules bond with each other. I sometimes see molecules that doesn’t seem to have a place to bond. For example, how would water molecules bond with each other in water? Would the oxygen bond to another hydrogen or something? I am very confused about this.
I still need to study more about bonding in general, I think I don’t a few key details that contribute to some confusion. Maybe I need relook at the powerpoints.
Overall, my understanding of bonding definitely has gotten better. I now know about intermolecular bonds instead of just intramolecular bonds. I like how knowing this explains the properties of daily things like water and sugar. I now think about molecules in a bigger picture.
Yay! My guess was right!
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